BHRFSCID Catalog
This table contains the Byurakan/Hamburg/ROSAT Catalog (BHRC) of
the optical identifications of X-ray sources. The BHRC includes all 2791
X-ray sources from the ROSAT Faint Source Catalog (ROSAT-FSC, CDS Catalog
<IX/29>) with galactic latitude |b| >= 30 degrees, declination >= 0 degrees,
and ROSAT PSPC count rate CR > 0.04 ct/s. The optical identifications were
carried out using the Hamburg Quasar Survey (HQS) digitized spectroscopic
plates, the DSS1 and DSS2 (blue, red, and IR) images, the MAPS photometric
data, the USNO-B1.0 (for proper motion), the NVSS and FIRST radio, and the
IRAS and 2MASS infrared catalogs.
From the DSS images, positional, brightness, color, extension, variability,
and proper-motion information, the optical-to-X-ray positional offsets
were obtained and a morphological classification was made. Available SIMBAD
and NED data were also utilized. Cross-correlations were made with AGN,
white dwarf, and cataclysmic variable catalogs (322, 8 and 7 associations,
respectively). The authors managed to identify 97% of the sources (2696/2791
sources) that are associated with 3202 optical objects. 2248 X-ray sources
have a single optical counterpart, 144 have a double or multiple optical
counterpart (binaries, galaxy groups, etc.), and 304 have ambiguous
identifications (some of the latter might actually be blends of two X-ray
sources that were not resolved by ROSAT). The QSOs and AGN represent the
largest group of X-ray counterparts (56.2%); bright stars (including
late-type stars, but excluding WDs and CVs) are counterparts for 33.2% of
the sources, and bright galaxies and groups of galaxies comprise 9.2%.
A number of close galaxy pairs (possibly interacting/merging galaxies)
are found as counterparts for X-ray sources (3.0%), as well as 1.0% WDs
and 0.4% CVs. The BHRC may be used for the selection and study of samples
of the various classes of X-ray emitters: the table gives all the available
multiwavelength data for the identified sources.
BMWHRICAT Catalog
The Brera Multi-scale Wavelet ROSAT High Resolution Imager Source Catalog
(BMW-HRI) is derived from all ROSAT HRI pointed observations with exposure
time longer than 100 seconds available in the ROSAT public archives. The data
were analyzed automatically using a wavelet detection algorithm suited to the
detection and characterization of both point-like and extended sources. This
algorithm is able to detect and disentangle sources in very crowded fields
and/or in presence of extended or bright sources. Images have been also
visually inspected after the analysis to ensure verification. The final
catalog, derived from 4,303 observations, consists of 29,089 sources detected
with a detection probability of greater or equal 4.2 sigma. For each source,
the primary catalog entries provide name, position, count rate, flux and
extension along with the relative errors. In addition, results of
cross-correlations with existing catalogs at different wavelengths (FIRST,
IRAS, 2MASS, and GSC2) are also reported. As an external check, the authors
compared their catalog with the previously available ROSHRICAT catalog (both
in its short and long versions) and were able to recover, for the short
version, ~90% of the entries. The sky coverage of the entire HRI data set was
computed by means of simulations. The complete BMW-HRI catalog provides a sky
coverage of 732 square degrees down to a limiting flux of ~1x10-12
erg/s/cm2 and of 10 square degrees down to ~1x10-14 erg/s/cm2. The
authors were able to compute the cosmological log(N)-log(S) distribution down
to a flux of about 1.2x10-14 erg/s/cm2.
CHASFRXRAY Catalog
This catalog contains a source list derived from observations of
the ROSAT all-sky survey (RASS) in the direction of the Chamaeleon star-forming
region cloud complex, as well as spectroscopic identifications for the detected
X-ray sources. The main purpose of this identification program was the search
for low-mass pre-main sequence stars. Sixteen previously known PMS stars were
detected with high confidence by ROSAT: eight are classical T Tauri stars and
eight are weak-line T Tauri stars. Seventy-seven new weak-line T Tauri stars
were identified on the basis of the presence of strong Li 6707 Angstrom
absorption, a spectral type later than F0, and chromospheric emission.
In addition, 6 new dKe-dMe candidates were found among the RASS sources.
Coordinates and count rates are given for all of the X-ray sources.
CMAR1XRAY Catalog
The CMa R1 star-forming region contains several compact clusters as well as
many young early-B stars. It is associated with a well-known bright rimmed
nebula, the nature of which is unclear (fossil HII region or supernova
remnant). To help elucidate the nature of the nebula, the authors' goal was
to reconstruct the star-formation history of the CMa R1 region, including the
previously unknown older, fainter low-mass stellar population, using X-rays.
The authors analyzed images obtained with the ROSAT satellite, covering
~5 square degrees. Complementary VRI photometry was performed with the
Gemini South telescope. Color-magnitude and color-color diagrams were used
in conjunction with pre-main sequence evolutionary tracks to derive the
masses and ages of the X-ray sources.
The ROSAT images show two distinct clusters. One is associated with the known
optical clusters near Z CMa, to which ~ 40 members are added. The other,
which the authors name the "GU CMa" cluster, is new, and contains ~ 60
members. The ROSAT sources are young stars with masses down to M_star ~ 0.5
M_sun, and ages up to 10 Myr. The mass functions of the two clusters are
similar, but the GU CMa cluster is older than the cluster around Z CMa by at
least a few Myr. Also, the GU CMa cluster is away from any molecular cloud,
implying that star formation must have ceased; on the contrary (as already
known), star formation is very active in the Z CMa region.
The two ROSAT observations that the authors analyzed are the following. By
order of increasing RA, the first Field ('Field 1' hereafter), HEASARC ID
RP201011 pointing axis RA(J2000} = 7h 00m, Dec(J2000) = -11o 30', has an
exposure of 19.7 ks. 'Field 2', HEASARC ID RP201277, pointing axis
RA(J2000) = 7h 04m, Dec(J2000) = -11o 33', has a much shorter exposure
of 4.6 ks.
This table contains the complete list of sources detected in CMa R1 by ROSAT.
DXRBS Catalog
The authors have undertaken a survey, the Deep X-Ray Radio Blazar Survey
(DXRBS), of archived, pointed ROSAT Position Sensitive Proportional Counter
(PSPC) data for blazars by correlating the ROSAT WGACAT database with several
publicly available radio catalogs, restricting their candidate list to
serendipitous flat radio spectrum sources (Alphar <= 0.70, where SNu ~
Nu-Alphar). In their first paper (DXRBS-I), the authors discuss their
survey methods, identification procedure, and first results. Their survey was
found to be 95% efficient at finding flat-spectrum radio-loud quasars (FSRQs;
59 of their first 85 identifications) and BL Lacertae objects (22 of their
first 85 identifications), a figure that is comparable to or greater than
that achieved by other radio and X-ray survey techniques. The identifications
presented therein showed that all previous samples of blazars (even when
taken together) did not representatively survey the blazar population,
missing critical regions of (LX, LR) parameter space within which large
fractions of the blazar population lie. Particularly important was the
identification of a large population of FSRQs (>=25% of DXRBS-I FSRQs) with
ratios of X-ray to radio luminosity >= 10-6 (Alpharx <= 0.78). In
addition, as a result of their greater sensitivity, the DXRBS-I already more
than doubled the number of FSRQs in complete samples with 5-GHz (radio)
luminosities between 1031.5 and 1033.5 ergs/s/Hz, and filled in the
region of parameter space between X-ray-selected and radio-selected samples
of BL Lac objects. The DXRBS-I was the very first sample to contain
statistically significant numbers of blazars at low luminosities, approaching
what should be the lower end of the FSRQ luminosity function.
In DXRBS-II, the authors presented new identifications and spectra for 106
sources, including 86 radio-loud quasars, 11 BL Lacertae objects, and nine
narrow-line radio galaxies. Together with the DXRBS-I objects and
already-known sources, their sample now contained 298 identified objects: 234
radio-loud quasars [181 flat-spectrum quasars: FSRQ (Alphar <= 0.50) and 53
steep-spectrum quasars: SSRQ], 36 BL Lacs and 28 narrow-line radio galaxies.
Redshift information is available for 96 per cent of these. Thus, the
selection technique was ~90 per cent efficient at finding radio-loud quasars
and BL Lacs. Reaching 5-GHz radio fluxes of ~ 50 mJy and 0.1 - 2.0 keV X-ray
fluxes of a few times 10-14 erg/cm2/s, DXRBS is the faintest and largest
flat-spectrum radio sample with nearly complete (~85 per cent)
identification.
The DXRBS-I entries in this catalog (identified by having values of the
parameter dxrbs_part equal to 1) contain data for 85 identified sources
meeting the authors' selection criteria. A number of sources were
serendipitously observed by ROSAT on more than one occasion, and, for
completeness, the WGACAT positions and values for these multiply observed
sources are listed separately, resulting in 102 DXRBS-I entries in this
catalog (71 sources with 1 X-ray observation, 11 sources with 2 X-ray
observations, and 3 sources with 3 X-ray observations).
The DXRBS-II entries in this catalog (identified by having values of the
parameter dxrbs_part equal to 2) contain data for 106 identified sources
meeting the authors' selection criteria. A number of sources were
serendipitously observed by ROSAT on more than one occasion, and, for
completeness, the WGACAT positions and values for these multiply observed
sources are listed separately. In one case (1WGA J0513.8+0156') the source
was detected twice by ROSAT and there are two possible optical counterparts:
there are 2 entries for each X-ray observation corresponding to the different
conterparts, resulting in a total of 4 entries for this source. There are 92
DXRBS-II sources with 1 X-ray observation, 11 sources with 2 X-ray
observations, 2 sources with 4 X-ray observations and 1 source with 5 X-ray
observations) resulting in 127 DXRBS-II entries for 106 sources in this
catalog. Four of the DXRBS-I objects (1WGA J0421.5+1433, 1WGA J0528.5-5820,
1WGA J1057.6-7724 and 1WGA J1222.6+2934) were also included in DXRBS-II as
higher signal-to-noise ratio (S/N) spectra were available. Thus, in the sum
of the 2 DXRBS parts presented here, there are 229 entries corresponding to
191 newly discovered sources. The 109 previously identified blazars, 97 of
which were listed in Table 6 of DXRBS-I, are not included in this table.
ETGALXRAY Catalog
This table contains a catalog of X-ray luminosities for 401 early-type
galaxies (and 24 other galaxies which were listed in previuous studies as
early but which have LEDA T-types >= -1.5), of which 136 are based on newly
analysed ROSAT PSPC pointed observations. The remaining luminosities are
taken from the literature and converted to a common energy band, spectral
model and distance scale. In their paper, the authors use this sample to
fit the LX/LB relation for early-type galaxies and find a best-fit
slope for the catalog of ~ 2.2. The authors demonstrate the influence of
group-dominant galaxies on the fit and present evidence that the relation
is not well modeled by a single power-law fit. They also derive estimates
of the contribution to galaxy X-ray luminosities from discrete-sources
and conclude that they provide L(discrete-source-contribution)/LB ~
29.5 erg s-1/LBsun. The authors compare this result with luminosities
from their catalog. Lastly, they examine the influence of environment on
galaxy X-ray luminosity and on the form of the LX/LB relation. They
conclude that although environment undoubtedly affects the X-ray properties
of individual galaxies, particularly those in the centres of groups and
clusters, it does not change the nature of whole populations.
The sample of early-type galaxies was selected from the Lyon-Meudon
Extragalactic Data Archive (LEDA). This catalog at that time contained
information on ~ 100,000 galaxies, of which ~ 40,000 had redshift and
morphological data. Galaxies were selected using the following criteria:
(i) Morphological Type T < -1.5 (i.e. E, E-S0 and S0 galaxies).
(ii) Virgo-corrected recession velocity V <= 9,000 km s-1.
(iii) Apparent Magnitude BT <= 13.5.
The redshift and apparent magnitude restrictions were chosen in order to
minimize the effects of incompleteness on their sample. The LEDA catalogue
is known to be 90 per cent complete at BT = 14.5, so the selection should
be close to statistical completeness. The selection process produced ~
700 objects. The authors then cross-correlated this list with a list of
public ROSAT PSPC pointings. Only pointings within 30 arcminutes of the
target were accepted, as, further off-axis, the PSPC point-spread function
becomes large enough to make analysis problematic. This left 209 galaxies
with X-ray data available.
The authors also added data from previously published catalogs, ROSAT
PSPC All-Sky Survey values from Beuing et al. (1999, MNRAS, 302, 209),
and Einstein IPC values from Fabbiano et al. (1992, ApJS, 80, 531)
and Roberts et al. (1991, ApJS, 75, 751). These other references use a
range of models to fit the data, different wavebands, distances and blue
luminosities. O'Sullivan et al. corrected for these differences by converting
the catalogs to a common set of values, as used for their own results.
All of the X-ray luminosities have been converted to a common format based
on a reliable distance scale (assuming H0 = 75 km s-1 Mpc-1), and
correcting for differences in spectral fitting techniques and waveband.
EUVEXRTCAT Catalog
The All-Sky Catalog of Faint Extreme-Ultraviolet (EUV) Sources
is a list of 534 objects detected jointly in the Extreme Ultraviolet
Explorer (EUVE) (100 Angstrom (AA) band) All-Sky Survey and in the ROSAT X-ray
Telescope (XRT) (0.25 keV band) All-Sky Survey. The joint selection criterion
within a 1.5 arcminute positional tolerance permitted the use of a low count
rate threshold in each survey. This low threshold was roughly 60% of the
threshold used in the previous EUVE all-sky surveys, and 166 of the objects
listed in this table were new EUV sources, appearing neither in the Second
EUVE Source Catalog nor in the ROSAT Wide Field Camera Second Catalog.
Preliminary identifications are offered for 105 of the 166 sources not
previously reported in any EUV catalog: by far the most numerous
(81) of the identifications are late-type (F-M) stars, while 18 are other
stellar types, only 5 are white dwarfs, and none are extragalactic. The
paucity of WDs and extragalactic objects may be explained by a strong horizon
effect wherein interstellar absorption strongly limits the effective
new-source search volume, and, thereby, selectively favors low-luminosity
nearby sources over more luminous but distant objects. Notice that, with the
adopted 1.5 arcminute acceptance criterion, about 50 spurious detections
are expected.
GALCENPSPC Catalog
This table contains a catalog of 107 point-like X-ray sources derived from a
systematic analysis of all the ROSAT PSPC observations of the Galactic Center
region performed in 1992-1993. Besides Sgr A*, the massive black hole at the
galactic center, 41 X-ray sources have been positionally associated with
already classified objects. Twenty are identified with foreground stars and
five with known Low Mass X-ray Binaries (LMXBs). The majority of the sources
in this catalog still remains unidentified. They are hard and/or severely
absorbed and probably represent a large population of X-ray binaries located
in the galactic center region, accreting at low accretion rates, and still
largely unknown.
Analyses were performed in 4 different energy ranges: 0.1 - 2.4 keV (PSPC
channels 8 - 240, the total energy band T), 0.1 - 0.4 keV (PSPC channels
8 - 40, the soft energy band S), 0.5 - 0.9 keV (PSPC channels 52 - 90, the
medium energy band), and 0.9 - 2.4 keV (PSPC channels 91 - 240, the hard
energy band H). A maximum likelihood method was applied to the merged photon
lists in each band. Only a detection liklihood larger than 10 (corresponding
to a probability of a chance detection smaller than e-10) was considered
to be a true source.
HRASSCAT Catalog
This table is a representation of part of the Hamburg/ROSAT All-Sky
Survey (RASS) Catalog (HRC) of optical identifications of X-ray sources at
high-galactic latitude, namely the list of X-ray sources. (The list of proposed
and possible optical counterparts is given in the linked Browse table
HRASSOPTID). The HRC includes all X-ray sources from the ROSAT
Bright Source Catalog (RASS-BSC) with galactic latitude |b| >= 30 degrees and
declination Dec >= 0 degrees. In this part of the sky covering ~10,000 square
degrees, the RASS-BSC contains 5341 X-ray sources. For the optical
identification, the HRC authors used blue Schmidt prism and direct plates
taken for the northern hemisphere Hamburg Quasar Survey (HQS) which are now
available in digitized form. The limiting magnitudes are 18.5 and 20,
respectively. For 82% of the selected RASS-BSC, an identification could be
given. For the rest, either no counterpart was visible in the error circle,
or a plausible identification was not possible. With ~42%, AGN represent
the largest group of X-ray emitters, ~31% have a stellar counterpart, whereas
galaxies and cluster of galaxies comprise only ~4% and ~5%, respectively. In
~3% of the RASS-BSC sources, no object was visible on the blue direct plates
within 40" around the X-ray source position. The catalog has been used as
a source for the selection of (nearly) complete samples of the various
classes of X-ray emitters.
HRASSOPTID Catalog
This table is a representation of part of the Hamburg/ROSAT All-Sky
Survey (RASS) Catalog (HRC) of optical identifications of X-ray sources at
high-galactic latitude, namely the list of proposed and possible optical
identifications. (The list of the X-ray sources themselves is given in the
linked Browse table HRASSCAT). The HRC includes all X-ray sources from the
ROSAT Bright Source Catalog (RASS-BSC) with galactic latitude |b| >= 30 degrees
and declination Dec >= 0 degrees. In this part of the sky covering ~10,000
square degrees, the RASS-BSC contains 5341 X-ray sources. For the optical
identification, the HRC authors used blue Schmidt prism and direct plates
taken for the northern hemisphere Hamburg Quasar Survey (HQS) which are now
available in digitized form. The limiting magnitudes are 18.5 and 20,
respectively. For 82% of the selected RASS-BSC, an identification could be
given. For the rest, either no counterpart was visible in the error circle,
or a plausible identification was not possible. With ~42%, AGN represent
the largest group of X-ray emitters, ~31% have a stellar counterpart, whereas
galaxies and cluster of galaxies comprise only ~4% and ~5%, respectively. In
~3% of the RASS-BSC sources, no object was visible on the blue direct plates
within 40" around the X-ray source position. The catalog has been used as
a source for the selection of (nearly) complete samples of the various
classes of X-ray emitters.
HYADESXRAY Catalog
This catalog contains the results of a complete X-ray survey of the Hyades
cluster region using X-ray data from the ROSAT All-Sky Survey (RASS)
that was published by Stern, Schmitt and Kahabka in 1995.
The Hyades survey covered over 900 square degrees of the sky. Over 185
optically identified Hyades were detected down to a limiting X-ray luminosity
of about 1-2x1028 ergs/s in the 0.1-1.8keV energy band. Among solar-like
stars, i.e., main-sequence stars of spectral type G, the RASS detection rate
was about 90%. Stern et al. argue that the presence of many binary systems
in the cluster is a key factor influencing the Hyades X-ray luminosity
function. Short-period (a few days or less) binaries are anomalously X-ray
bright, as might have been expected; however, the X-ray luminosity functions
of K and possibly M binary stars of all types are significantly different from
their single counterparts, confirming the results of Pye et al. (1994, MNRAS,
266, 798) based on a smaller K star sample drawn from deep ROSAT pointings.
Comparison with Einstein Observatory studies of a subset of Hyades stars
demonstrates a general lack of significant (> a factor of 2) long-term X-ray
variability. Stern et al. suggest that this may be the result of the dominance
of a small-scale, turbulent dynamo in the younger Hyades stars compared to the
large-scale, cyclic dynamo observed in the Sun.
The HYADESXRAY database consists of X-ray data for 440 probable and possible
Hyades members that were included in the Stern et al. survey and were listed
in Table 1 of their published paper. The database contains both stars which
were detected as X-ray sources and those which were not: for the latter,
upper limits to their X-ray emission are provided. For all listed stars,
their X-ray luminosities based on a Hyades distance of 45 pc are provided;
for some stars, for which individually determined distances from either the
Schwan (1991, A&A, 243, 386) or the Hanson (1975, AJ, 80, 379) proper motion
surveys are available, their X-ray luminosities based on these alternate
distances are also provided. There were 4 stars detected as RASS sources out
of over 180 new Hyades candidates listed in the Reid (1992, MNRAS, 257, 257)
proper motion survey which were included in Table 2 (but not Table 1) of the
Stern et al. paper. These stars are not included in the current database, but
are listed in the help section entitled Reid_Stars (q.v.). Similarly, there
were 20 stars detected as RASS sources but which were considered by Stern et
al. to be non-members of the Hyades which were included in their Table 3 (but
not Table 1). These stars are not included in the current database, but
are listed in the help section entitled Rejected_Hyades (q.v.).
LMCHRIXRAY Catalog
All 543 pointed observations of the ROSAT High Resolution Imager
(HRI) with exposure times higher than 50 seconds, and performed between 1990
and 1998 in a field of 10 by 10 degrees covering the Large Magellanic Cloud
were analyzed, and a source catalogue was produced that contains 397 X-ray
sources whose properties have been measured with the HRI. The list was
cross-correlated with the ROSAT Position Sensitive Proportional Counter
(PSPC) LMC source catalogue of Haberl and Pietsch (1999, A&AS, 139, 277;
the HEASARC database LMCROSXRAY) in order to obtain the (PSPC) hardness
ratios for the X-ray sources detected by both instruments. 138 HRI sources
are contained in the PSPC Catalogue, while 259 sources are new detections.
The spatial resolution of the HRI being better than that of the PSPC,
source positions could be determined with errors smaller than 15 arcsec
which are dominated by systematic errors. After cross-correlating the
source catalogue with the SIMBAD database and the Tycho Catalogue, 94
HRI sources were identified with known objects based on their positional
coincidences and X-ray properties. Whenever more accurate coordinates were
given in catalogues or the literature, the X-ray coordinates were
corrected and the systematic error of the X-ray position was reduced.
For other sources observed simultaneously with an identified source,
the positional coordinates were also improved. In total, the X-ray
positions of 254 sources were newly determined. The sources identified
in this study include 39 foreground stars, 24 supernova remnants (SNR), 5
supersoft sources, 9 X-ray binaries, and 9 active galactic nuclei (AGN)
well-known from the literature. Another 8 sources were identified with
known candidates for these source classes. An additional 21 HRI sources
were suggested by the authors as candidates for SNR, X-ray binaries in
the LMC, or background AGN, because of their spatial extents, hardness
ratios, X-ray to optical flux ratios, or flux variability.
LMCROSXRAY Catalog
More than 200 ROSAT PSPC observations performed between 1990
and 1994 in a 10 by 10 degree field centered on the Large Magellanic Cloud
(LMC) have been analyzed on order to derive a catalogue of X-ray sources.
The list contains 758 sources together with their X-ray properties. From
cross-correlations of the PSPC catalogue with the SIMBAD data base and
literature searches likely identifications are given in the paper from
which this catalogue was derived (Haberl & Pietsch 1999, A&AS, 139, 277:
Table 10) for 144 of these X-ray sources based on positional coincidence,
but also taking into account X-ray properties like hardness ratios and
source extent. Forty-six known sources are associated with supernova
remnants and candidates in the LMC (SNRs: Haberl & Pietsch 1999, A&AS, 139,
277: Table 6), most of them already detected by previous X-ray missions.
The number of known X-ray binaries in the LMC has increased to 17, and of
supersoft sources to 9. The remaining ~50% of the identified sources
comprise mainly foreground stars (up to 57) and background extragalactic
objects (up to 15).
M31ROSXRAY Catalog
This catalog is the complete ROSAT PSPC Source List of X-ray
sources found in two surveys of M 31 reported by Supper et al. (1997, 2001).
These papers reported the results of the analysis of the two ROSAT PSPC surveys
of M 31 performed in the summers of 1991 and 1992, respectively.
summer 1992. Supper et al. (2001) compare and combine the results from the two
surveys. In the first survey, 396 X-ray point sources were detected, and an
identical number in the second survey, although this equality is coincidental,
as the source lists are different and contain only 239 sources in common.
Within the approximately 10.7 square degrees field of view of the second
survey, 396 individual X-ray sources were detected, of which 164 sources were
new detections. When combined with the first survey, this resulted in a total
of 560 X-ray sources in the field of M 31. Their (0.1 keV-2.0 keV) fluxes range
from 7 x 10-15 to 7.6 x 10-12 erg cm-2 s-1, and of these 560
sources, 55 are tentatively identified with foreground stars, 33 with globular
clusters, 16 with supernova remnants, and 10 with radio sources and galaxies
(including M 32). A comparison with the results of the Einstein M 31 survey
reveals 491 newly detected sources, 11 long-term variable sources, and 7
possible transient sources. Comparing the two ROSAT surveys, Supper et al.
come up with 34 long-term variable sources and 8 transient candidates. For
the M 31 sources, the observed X-ray luminosities range from 4 x 1035 to
4 x 1038 erg s-1. The total (0.1 keV-2.0 keV) luminosity of M 31 is
(3.4 +/- 0.3) x 1039 erg s-1, distributed approximately equally
between the bulge and disk. Within the bulge region, the luminosity of a
possible diffuse component combined with faint sources below the detection
threshold is (2.0 +/- 0.5) x 1038 erg s-1. An explanation in
terms of hot gaseous emission leads to a maximum total gas mass of
(1.0 +/- 0.3) x 106 solar masses.
The conversion of PSPC count rates into X-ray fluxes depends on the assumed
spectral shape. For M 31-sources, a power law with photon index of -2.0 and
an intervening column density pf 9 x 1020 H atoms cm-2 may be used,
leading to the conversion factor of 1 ct/ksec = 3.00 x 10-14 erg cm-2
s-1 in the 0.1-2.0 keV broad band. For foreground stars, the application
of this conversion factor leads to an over-estimate of the fluxes.
MCXC Catalog
The MCXC is the Meta-Catalog of the compiled properties of X-ray detected
Clusters of galaxies. This very large catalog is based on publicly available
ROSAT All Sky Survey (RASS)-based (NORAS, REFLEX, BCS, SGP, NEP, MACS, and
CIZA) and ROSAT serendipitous (160SD, 400SD, SHARC, WARPS, and EMSS) cluster
catalogs. Data have been systematically homogenised to an overdensity of 500,
and duplicate entries from overlaps between the survey areas of the
individual input catalogs have been carefully handled. The MCXC comprises
1743 clusters with virtually no duplicate entries. For each cluster, the MCXC
provides three identifiers, a redshift, coordinates, membership in the
original catalog, and standardised 0.1 - 2.4 keV band luminosity Lx500,
total mass M500, and radius R500, where the 500 suffix means that the
quantity has been calculated up to a standard characteristic radius R500,
the radius within which the mean overdensity of the cluster is 500 times the
critical density at the cluster redshift . The meta-catalog additionally
furnishes information on overlaps between the input catalogs and the
luminosity ratios when measurements from different surveys are available, and
gives notes on individual objects. The MCXC is made available so as to
provide maximum usefulness for X-ray, Sunyaev-Zel'dovich (SZ) and other
multiwavelength studies.
The catalogs and sub-catalogs included in this meta-catalog are listed in
Table 1 of the reference paper, and come from the following references:
Catalog Sub- Reference Title
Catalog or CDS Cat. (Author)
RASS IX/10 ROSAT All-Sky Bright Source Catalog (1RXS)
(Voges+, 1999)
BCS
BCS J/MNRAS/301/881 ROSAT brightest cluster sample - I.
(Ebeling+, 1998)
eBCS J/MNRAS/318/333 Extended ROSAT Bright Cluster Sample
(Ebeling+ 2000)
CIZA X-ray clusters behind the Milky Way
CIZAI ApJ, 580, 774
(Ebeling+, 2002)
CIZAII J/APJ/662/224
(Kocevski+, 2007)
EMSS ApJS, 72, 567 Einstein Extended Medium Sensitivity Survey
(Gioia+, 1990)
EMSS_1994 ApJS, 94, 583
(Gioia & Luppino, 1994)
EMSS_2004 ApJ, 608, 603
(Henry 2004)
MACS ApJ, 553, 668 Massive Cluster Survey
(Ebeling+, 2001)
MACS_MJFV ApJS, 174, 117
(Maughan+, 2008)
MACS_BRIGHT MNRAS, 407, 83
(Ebeling+, 2010)
MACS_DIST ApJ, 661, L33
(Ebeling+, 2007)
NEP NEP J/ApJS/162/304 ROSAT NEP X-ray source catalog
(Henry+, 2006)
NORAS/
REFLEX
NORAS J/ApJS/129/435 NORAS galaxy cluster survey. I.
(Boehringer+, 2000)
REFLEX J/A+A/425/367 REFLEX Galaxy Cluster Survey Cat
(Boehringer+, 2004)
SGP SGP J/ApJS/140/239 Clusters of galaxies around SGP
(Cruddace+, 2002)
SHARC
SHARC_BRIGHT J/ApJS/126/209 Bright SHARC survey cluster catalog
(Romer+, 2000)
SHARC_SOUTH J/MNRAS/341/1093 The Southern SHARC catalog
(Burke+, 2003)
WARPS
WARPSI J/ApJS/140/265 WARPS survey. VI.
(Perlman+, 2002)
WARPSII J/ApJS/176/374 WARPS-II Cluster catalog. VII.
(Horner+, 2008)
160SD
160SD J/ApJ/594/154 160 square degree ROSAT Survey
(Mullis+, 2003)
400SD J/ApJS/172/561 400 square degree ROSAT Cluster Survey
(Burenin+, 2007)
400SD_SER Serendipitous clusters
400SD_NONSER Not entirely serendipitous clusters
NEWMDWARFS Catalog
This table contains the results from a spectroscopic study of 1080 nearby
active M dwarfs, selected by correlating the Two Micron All Sky Survey (2MASS)
and ROSAT catalogs at galactic latitudes greater than 15 degrees above or
below the Galactic Plane and using a matching radius of 20 arcseconds, as
well as color cuts (J-H < 0.75, H-K > 0.15 and 0.8 < J-K < 1.1) designed to
select M dwarfs. The authors have derived the spectral types and estimated
distances for all of their stars. The spectral types range between K5 and
M6. Nearly half of the stars lie within 50 pc. The authors have measured the
equivalent width of the H-alpha emission line. Their targets show an increase
in chromospheric activity from early to mid-spectral types, with a peak in
activity around M5. Using the count rate and hardness ratios obtained from
the ROSAT catalog,the authors have derived the stellar X-ray luminosities.
Their stars display a "saturation-type" relation between the chromospheric
and coronal activity. The relation is such that log LX/Lbol remains
"saturated" at a value of approximately -3 for varying H-alpha equivalent
width. The authors have found 568 matches in the USNO-B catalog and have
derived the tangential velocities vtan for these stars. There is a slight
trend of decreasing chromospheric activity with age, such that the stars
with higher vtan values have lower H-alpha equivalent widths. The coronal
emission, however, remains saturated at a value of log LX/Lbol ~ -3 for
varying tangential velocities, suggesting that the coronal activity remains
saturated with age. The authors do not find any break in the saturation-type
relation at the spectral type at which stars become fully convective
(~M3.5). Most of the stars in their sample show more coronal emission than
the dMe stars in the Hyades and Praesepe clusters and have vtan < 40 km
s-1, suggesting that they belong to a young population.
NORAS Catalog
In the construction of an X-ray-selected sample of galaxy clusters
for cosmological studies, the authors have assembled a sample of 495 X-ray
sources which were found to show extended X-ray emission in the first
processing of the ROSAT All-Sky Survey (RASS I), the Northern ROSAT All-Sky
(NORAS) Galaxy Cluster Survey Catalog. The sample covers the celestial region
with declination >=0 degrees and Galactic latitude |b| >= 20 degrees, and
comprises sources with a Position Sensitive Proportional Counter (PSPC) count
rate >= 0.06 counts/s and a source extent likelihood of L >= 7. In an optical
follow-up identification program, the authors found 378 (76%) of these sources
to be clusters of galaxies.
It was necessary to reanalyze the sources in this sample with a new
X-ray source characterization technique to provide more precise values
for the X-ray flux and source extent than obtained from the standard
processing. This new method, termed growth curve analysis (GCA), has the
advantage over previous methods in its ability to be robust, to be easy
to model and to integrate into simulations, to provide diagnostic plots
for visual inspection, and to make extensive use of the X-ray data. The
source parameters obtained assist the source identification and provide
more precise X-ray fluxes. This reanalysis is based on data from the
more recent second processing of the ROSAT Survey, RASS II. The authors
present a catalog of the cluster sources with the X-ray properties obtained
as well as a list of the previously flagged extended sources that are found
to have a non-cluster counterpart. In their paper, they discuss the process
of source identification from the combination of optical and X-ray data.
To investigate the overall completeness of the cluster sample as a
function of the X-ray flux limit, they extended the search for X-ray cluster
sources to the RASS II data for the northern sky region between 9 and 14
hours in right ascension. They included the search for X-ray emission from
known galaxy clusters as well as a new investigation of extended X-ray
sources. In the course of this search, they found X-ray emission from 85
additional Abell clusters and 56 very probable cluster candidates among
the newly found extended sources. A comparison of the X-ray cluster number
counts of the NORAS sample with the ROSAT-ESO Flux-limited X-ray (REFLEX)
Cluster Survey results leads to an estimate of the completeness of the NORAS
sample of ROSAT All-Sky Survey (RASS) I extended clusters of about 50% at
an X-ray flux of FX(0.1-2.4 keV) = 3 x 10-12 ergs s-1 cm-2. The estimated
completeness achieved by adding the supplementary sample in the study area
amounts to about 82% in comparison to REFLEX. The low completeness introduces
an uncertainty in the use of the sample for cosmological statistical studies
that will be cured with the completion of the continuing Northern ROSAT
All-Sky (NORAS) Cluster Survey project.
NWAYAWGROS Catalog
This table contains the 132,254 AllWISE counterparts and/or Gaia matches to
106,573 X-ray sources detected in the ROSAT 2RXS survey with Galactic
latitude |b| > 15 degrees. These are the brightest X-ray sources in the sky,
but their position uncertainties and the sparse multi-wavelength coverage
until now rendered the identification of their counterparts a demanding task
with uncertain results. New all-sky multi-wavelength surveys of sufficient
depth, like AllWISE and Gaia, and a new Bayesian statistics-based algorithm,
NWAY, allow us, for the first time, to provide reliable counterpart
associations.
NWAY extends previous distance- and sky density-based association methods
and, using one or more priors (e.g. colors, magnitudes), weights the
probability that sources from two or more catalogs are simultaneously
associated on the basis of their observable characteristics. Here,
counterparts have been determined using a Wide-field Infrared Survey Explorer
(WISE) color-magnitude prior. A reference sample of 4,524 XMM/Chandra and
Swift X-ray sources demonstrates a reliability of 94.7 per cent for 2RXS
sources. Combining the results of this work and of the matching of XMM-Newton
Slew Survey, Version 2 (XMMSL2) sources also reported in this study (the
results of the latter are available as the HEASARC's database table
NWAYAWGXMM) with Chandra-COSMOS data, the authors propose a new separation
between stars and AGN in the X-ray/WISE flux-magnitude plane, that is valid
over six orders of magnitude. The authors also release the NWAY code and its
user manual. NWAY was extensively tested with XMM-COSMOS data.
Using two different sets of priors, the authors find an agreement of 96 per
cent and 99 per cent with published Likelihood Ratio methods. Their results
were achieved faster and without any follow-up visual inspection. With the
advent of deep and wide area surveys in X-rays (e.g. SRG/eROSITA, Athena/WFI)
and radio (ASKAP/EMU, LOFAR, APERTIF, etc.), NWAY will provide a powerful and
reliable counterpart identification tool.
For all the available options, see the NWAY manual at
https://github.com/JohannesBuchner/nway/raw/master/doc/nway-manual.pdf.
ORIONXRAY Catalog
This catalog presents some of the results from 3 deep ROSAT High Resolution
Imager (HRI) observations of the Orion Nebula star-forming region. The fields
covered by the X-ray images contain over 1500 catalogued stars in a roughly
0.8 square degree region centered on the Trapezium. In all, 389 distinct X-ray
sources were detected, at least two-thirds of which were associated with a
single proper-motion cluster member. X-ray emission was detected from
stars of all spectral types, from the massive O- and B-type components
of the Trapezium to the coolest, low-mass pre-main-sequence (PMS) stars.
In the research paper in which these data were presented (Gagne et al.
1995), the authors focussed primarily on X-ray emission from the
late-type PMS stars. Of the ~100 late-type cluster members with
measured spectral types, approximately three-fourths were detected; the
authors derived X-ray luminosity upper limits for the remaining stars. They
found that coronal X-ray emission appeared to turn on at around a
spectral type of F6, with the upper envelope of activity increasing with
decreasing effective temperature.
The current database is a concatenation of Tables 2 and 3 from Gagne et al.
(1995) which list the 389 distinct X-ray sources and their candidate optical
counterparts. A detection criterion of 3 sigma was used, i.e., a sigal-to-noise
ratio criterion of 3. 324 of the X-ray sources have a single candidate optical
counterpart, 50 of the X-ray sources (listed in Table 3 of the original
paper) have multiple candidates for the optical counterparts, and the remainder
have no optical counterparts. Notice that Table 6 of Gagne et al. (1995) which
presents a compilation of optical and X-ray data for a sub-group of the Orion
stars for which data on the spectral types and the spectroscopic rotational
velocities or the photometric rotational periods are available is not part of
this database.
ORIONXSTAR Catalog
This catalog presents some of the results from 3 deep ROSAT High Resolution
Imager (HRI) observations of the Orion Nebula star-forming region. The fields
covered by the X-ray images contain over 1500 catalogued stars in a roughly
0.8 square degree region centered on the Trapezium. In all, 389 distinct X-ray
sources were detected, at least two-thirds of which were associated with a
single proper-motion cluster member. X-ray emission was detected from
stars of all spectral types, from the massive O- and B-type components
of the Trapezium to the coolest, low-mass pre-main-sequence (PMS) stars.
In the research paper in which these data were presented (Gagne et al.
1995), the authors focussed primarily on X-ray emission from the
late-type PMS stars. Of the ~100 late-type cluster members with
measured spectral types, approximately three-fourths were detected; the
authors derived X-ray luminosity upper limits for the remaining stars. They
found that coronal X-ray emission appeared to turn on at around a
spectral type of F6, with the upper envelope of activity increasing with
decreasing effective temperature.
The current database is a representation of Table 6 from Gagne et al.
(1995) (notice that the data given in Tables 2 and 3 of this reference is
included in the HEASARC database ORIONXRAY, q.v.) which lists X-ray and other
data for 175 Orion stars for which spectral types, spectroscopic rotational
velocities, and/or spot-modulated photometric rotational periods are available.
The X-ray data (either detections or upper limits) are given in the form of
X-ray luminosities log Lx and X-ray to bolometric luminosity ratios (log
Lx/Lbol). The conversion factor from HRI counts to log Lx was derived for each
star based on (i) an assumed 1 keV Raymond and Smith thermal spectrum, (ii) a
distance of 440 pc, and (iii) a column density of 2 x 10^21 cm^(-2) per
magnitude of visual extinction A(V), where accurate A(V) values are used when
available, or otherwise a moderate absorption of 0.25 magnitudes is assumed.
Notice that, for stars not identified as candidate optical counterparts in
Tables 2 and 3 of Gagne et al. (the HEASARC database ORIONXRAY), the derived
upper limit to the X-ray luminosity usually corresponds to the 3 sigma upper
limit to the observed count rate. For a handful of stars in the Trapezium
region where a star was eliminated as a candidate optical counterpart, despite
being within the source search circle, because a more likely counterpart had
a smaller position offset, the upper limit corresponds to either half the
observed X-ray source count rate or to 3 sigma, whichever is the highest.
Such cases are indicated in this database by the presence of the string "NN"
in the parameter 'Note'.
PLEIADXRAY Catalog
This catalog contains the results of a deep X-ray survey of
the core region of the Pleiades open cluster carried out with ROSAT. In
a single PSPC field (~1 degree in radius), 99 of 214 Pleiades stars are
detected in X-rays, and upper limits are computed for the remainder.
This catalog lists the characteristics of these stars taken from the
literature, including their rotational data, as well as their X-ray
characteristics. The nucleus of the composite catalog used in this study
is the catalog compiled from the published literature for the Einstein
investigations of the Pleiades (Micela et al. 1990, ApJ, 348, 557). This list
has been extended by the results of recent surveys to a completeness limit of
visual magnitude of about 18.
QORGCAT Catalog
The Quasars.org (QORG) Catalog is an all-sky optical catalog of radio/X-ray
sources. The QORG Catalog aligns and overlays the year 2001/2 releases of the
ROSAT HRI, RASS, PSPC and WGA X-ray catalogs, the NVSS (2002), FIRST (2003)
and SUMSS (2003) radio catalogs, the Veron QSO catalog (2003) and various
galaxy/star reference catalogs onto the optical APM and USNO-A catalogs. This
catalog displays calculated percentage probabilities for each optical,
radio/X-ray associated object of its likelihood of being a quasar, galaxy,
star, or erroneous radio/X-ray association.
This table contains the main Master QORG catalog (master.dat) and contains
all 501,756 radio/X-ray associated optical objects and known quasars which
are optically detected in APM/USNO-A. Up to six radio/X-ray catalog
identifications are presented for each optical object, plus any double radio
lobes (21,498 of these). These are superimposed (and laterally fitted) onto a
670,925,779-object optical background which combines APM and USNO-A data.
Other subsets of this master catalog are available at the CDS, including the
Free-Lunch catalog, a concise easy-to-read variant of the Master catalog
showcasing just one X-ray and/or radio identification for each object, a
subset catalog of QSO candidates, and a subset catalog of known
QSOs/galaxies/stars.
Objects presented in this catalog are those optical APM/USNO-A objects which
are associated with X-ray/radio detections, or any optically-found catalogued
QSO/AGN/Bl Lac objects, which have confidence levels >40% of being
radio/X-ray emitting optical objects. There are 501,756 objects included in
all (including 48,285 catalogued quasars), representing the 99.4% coverage of
the sky which is available from the APM and USNO-A. Each object is shown as
one entry giving the position in equatorial coordinates, red and blue optical
magnitudes (recalibrated) and PSF class, calculated probabilities of the
object being, separately, a quasar, galaxy, star, or erroneous radio/X-ray
association, any radio identification from each of the NVSS, FIRST and SUMSS
surveys, including candidate double-lobe detections, any X-ray identification
from each of the ROSAT HRI, RASS, PSPC and WGA surveys, including fluxes and
field shifts of those identifications, plus, if already catalogued, the
object name and redshift where applicable.
The QORG catalog and supporting data can be accessed from the catalog home
page at http://quasars.org/qorg-data.htm Questions or comments on the catalog
contents may be directed to the first author Eric Flesch at eric@flesch.org.
The authors request that researchers using this catalog make a small
acknowledgement of such use in any published papers which thereby result.
RASS2FOID Catalog
The optical identification of large number of X-ray sources such as those
from the ROSAT All-Sky Survey is challenging with conventional spectroscopic
follow-up observations. The authors have investigated two ROSAT All-Sky
Survey fields of size 10 degrees by 10 degrees each, one at a galactic
latitude b = 83o (26 Com), the other at b = -5o (gamma Sge), in order to
optically identify the majority of sources. They used optical variability,
among other more standard methods, as a means of identifying a large number
of ROSAT All- Sky Survey sources. All objects fainter than about 12th
magnitude and brighter than about 17th magnitude in or near the error circle
of the ROSAT positions were tested for optical variability on hundreds of
archival plates of the Sonneberg field patrol.
The reference paper contains probable optical identifications of altogether
256 of the 370 ROSAT sources analyzed. In particular, the authors found 126
active galactic nuclei (some of them may be misclassified cataclysmic
variables, CVs), 17 likely clusters of galaxies, 16 eruptive double stars
(mostly CVs), 43 chromospherically active stars, 65 stars brighter than about
13th magnitude, 7 UV Ceti stars, 3 semi-regular or slow irregular variable
stars of late spectral type, 2 DA white dwarfs, 1 Am star, 1 supernova
remnant, and 1 planetary nebula. As expected, nearly all active galactic
nuclei are found in the high-galactic latitude field, while the majority of
CVs is located at low galactic latitudes. The authors identify in total 72
new variable objects. X-ray emission is, not unexpectedly, tightly correlated
with optical variability, and thus their new method for optically identifying
X-ray sources is demonstrated to be feasible. Given the large number of
optical plates used, this method was most likely not more efficient than, for
example, optical spectroscopy. However, it required no telescope time, only
access to archival data.
This table contains the optical spectroscopic and photometric properties of
the 722 possible optical counterparts to the 370 ROSAT point sources found by
the authors in the 2 examined fields above a maximum likelihood threshold of
8. It is essentially the union of the 314 counterparts which were listed in
Table 8 (26 Com field) of the reference paper with the 408 counterparts
listed in Table 9 (gamma Sge field) of that paper. We have removed 12 entries
from Table 8 for which no optical counterpart was found (1033, 1050, 1060,
1085, 1091, 1103, 1129, 1166, 1177, 1190, 1217 and 1237), 1 additional entry
from the same table (1071) where the X-ray emission is more likely associated
with galaxy cluster gas emission rather than an individual galaxy in that
cluster, and 7 entries from Table 9 (source numbers 2087-2091 and 2093-2094
which are detections of flux enhancements of an extended supernova remnant
(SNR 053.6-02.2), for a total of 20 removed, since none of these entries had
any positional or optical data given in the original tables.
The combined lists of the X-ray sources which were given in Table 1 (26 Com
field) of the reference paper and Table 2 (gamma Sge field) of that paper are
available in the HEASARC table RASS2FXRAY
(to which the present table is linked).
RASS2FXRAY Catalog
The optical identification of large number of X-ray sources such as those
from the ROSAT All-Sky Survey is challenging with conventional spectroscopic
follow-up observations. The authors have investigated two ROSAT All-Sky
Survey fields of size 10 degrees by 10 degrees each, one at a galactic
latitude b = 83o (26 Com), the other at b=-5o (gamma Sge), in order to
optically identify the majority of sources. They used optical variability,
among other more standard methods, as a means of identifying a large number
of ROSAT All- Sky Survey sources. All objects fainter than about 12th
magnitude and brighter than about 17th magnitude in or near the error circle
of the ROSAT positions were tested for optical variability on hundreds of
archival plates of the Sonneberg field patrol.
The reference paper contains probable optical identifications of altogether
256 of the 370 ROSAT sources analyzed. In particular, the authors found 126
active galactic nuclei (some of them may be misclassified cataclysmic
variables, CVs), 17 likely clusters of galaxies, 16 eruptive double stars
(mostly CVs), 43 chromospherically active stars, 65 stars brighter than about
13th magnitude, 7 UV Ceti stars, 3 semi-regular or slow irregular variable
stars of late spectral type, 2 DA white dwarfs, 1 Am star, 1 supernova
remnant, and 1 planetary nebula. As expected, nearly all active galactic
nuclei are found in the high-galactic latitude field, while the majority of
CVs is located at low galactic latitudes. The authors identify in total 72
new variable objects. X-ray emission is, not unexpectedly, tightly correlated
with optical variability, and thus their new method for optically identifying
X-ray sources is demonstrated to be feasible. Given the large number of
optical plates used, this method was most likely not more efficient than, for
example, optical spectroscopy. However, it required no telescope time, only
access to archival data.
This table contains the X-ray properties of the 370 ROSAT point sources found
by the authors in the 2 fields that they examined above a maximum likelihood
threshold of 8. It is essentially the union of the 238 sources which were
listed in Table 1 (26 Com field) of the reference paper with the 132 sources
listed in Table 2 (gamma Sge field) of that paper. Notice that the source
detection criterion for the ROSAT All-Sky Survey (RASS: 1RXS Catalog) had a
slightly higher threshold of 10, so that the present source list is more
extensive than the 1RXS Catalog source list in these two areas. The lists of
the optical counterparts to these X-ray sources and their spectroscopic and
photometric properties which were given in Table 8 (26 Com field) of the
reference paper and Table 9 (gamma Sge field) of that paper are available in
the HEASARC table RASS2FOID (to which the present table is linked).
RASS2MASS Catalog
The 18,806 ROSAT All Sky Survey Bright Source Catalog (RASS/BSC)
X-ray sources are quantitatively cross-associated with near-infrared (NIR)
sources from the Two Micron All Sky Survey Point Source Catalog (2MASS/PSC).
An association catalog is presented, listing the most likely counterpart for
each RASS/BSC source, the probability P_id (called id_prob in the HEASARC
version of this catalog) that the NIR source and X-ray source
are uniquely associated, and the probability P_no-id (called no_id_prob in
the HEASARC version of this catalog) that none of the 2MASS/PSC
sources are associated with the X-ray source. The catalog includes 3853 high
quality (P_id>0.98) X-ray-NIR matches, 2280 medium quality (0.98 >= P_id > 0.9)
matches, and 4153 low quality (0.9 >= P_id > 0.5) matches. Of the high quality
matches, 1418 are associations that are not listed in the SIMBAD database, and
for which no high quality match with a USNO-A2 optical source was presented
for the RASS/BSC source in previous work (Rutledge et al. 2000, ApJS, 131,
335). The present work offers a significant number of new associations with
RASS/BSC objects that will require optical/NIR spectroscopy for classification.
For example, of the 6133 P_id > 0.9 2MASS/PSC counterparts presented in the
association catalog, 2411 have no classification listed in the SIMBAD database.
These 2MASS/PSC sources will likely include scientifically useful examples of
known source classes of X-ray emitters (white dwarfs, coronally active stars,
active galactic nuclei), but they may also contain previously unknown source
classes. It is determined that all coronally active stars in the RASS/BSC
should have a counterpart in the 2MASS/PSC, and that the unique association of
these RASS/BSC sources with their NIR counterparts thus is confusion limited.
RASS2RXS Catalog
This database table contains the Second ROSAT All-Sky Survey Point Source
Catalog (2RXS). This is the second publicly released ROSAT catalog of
point-like sources obtained from the ROSAT All-Sky Survey (RASS) observations
performed with the Position-Sensitive Proportional Counter (PSPC) between
June 1990 and August 1991. It is an extended, revised, and combined version
of the RASS Bright and
Faint Source Catalogs. Utilizing the latest
RASS processing, this catalog includes more than 135,000 X-ray detections in
the 0.1-2.4 keV energy band down to a likelihood threshold of 6.5.
Additional information can be found at http://www.mpe.mpg.de/ROSAT/2RXS/.
RASS6DFGS Catalog
This table contains a catalog of 3405 X-ray sources from the ROSAT
All Sky Survey (RASS) Bright Source Catalog which fall within the area covered
by the 6dF Galaxy Survey (6dFGS). The catalog is count-rate limited at 0.05 ct
s-1 in the X-ray and covers the area of sky with Declination < 0 degrees and
|b| > 10 degrees. The RASS-6dFGS sample was one of the additional target
catalogs of the 6dFGS and as a result the authors obtained optical spectra for
2224 (65 per cent) RASS sources. Of these, 1715 (77%) have reliable redshifts
with a median redshift of z = 0.16 (excluding the Galactic sources). For the
optically bright sources (b_J <= 17.5) in the observed sample, over 90%
have reliable redshifts. The catalog mainly comprises quasi-stellar
objects (QSOs) and active galaxies but also includes 238 Galactic sources. Of
the sources with reliable redshifts, the majority are type 1 active galactic
nuclei (AGN, 69%), while 12% are type 2 AGN, 6% absorption-line galaxies and
13% are stars. The authors also identify a small number of optically faint,
very low redshift, compact objects which fall outside the general trend in the
b_J - z plane. The RASS-6dFGS catalog complements a number of Northern
hemisphere samples, particularly the ROSAT Bright Source Catalogue-NRAO VLA
Sky Survey (RBSC-NVSS) sample (Bauer et al. 2000, ApJS, 129, 547), and
furthermore, in the same region of sky (-40 degrees < Declination
< 0 degrees) reveals an additional 561 sources that were not
identified as part of that sample.
The authors detect 918 sources (27%) of the RASS-6dFGS sample in the radio
using either the 1.4 GHz NVSS or the 843 MHz Sydney University Molonglo Sky
Survey (SUMSS) catalogues and find that the detection rate changes with
redshift. At redshifts larger than 1 virtually all of these sources have radio
counterparts and with a median flux density of 1.15 Jy, they are much stronger
than the median flux density of 28.6 mJy for the full sample. The authors
attribute this to the fact that the X-ray flux of these objects is being
boosted by a jet component, possibly Doppler boosted, that is only present in
radio-loud AGN.
The RASS-6dFGS sample provides a large set of homogeneous optical spectra
ideal for future studies of X-ray emitting AGN.
RASSAEQSO Catalog
This table contains some of the first results of a survey for
bright quasars (V < 14.5 and R < 15.4) covering the northern hemisphere at
Galactic latitudes |b| > 30 degrees. The photometric database is derived from
the Guide Star and USNO catalogs. Quasars are identified on the basis of
their X-ray emission measured in the ROSAT All-Sky Survey (RASS). The surface
density of quasars brighter than 15.5 magnitudes turns out to be
(10 +/- 2) x 10-3 degrees-2, about 3 times higher than that estimated by
the Palomar-Green (PG) survey. In the paper, the quasar optical luminosity
function (LF) at 0.04 < z <= 0.3 is computed and shown to be consistent with a
luminosity-dependent luminosity evolution of the type derived by La
Franca & Cristiani (1997AJ....113.1517L) in the range 0.3 < z <=2.2. The
predictions of semianalytical models of hierarchical structure
formation agree remarkably well with the present observations.
RASSASASEB Catalog
The authors have combined their catalog of eclipsing binaries from the
All-Sky Automated Survey (ASAS) with the ROSAT All-Sky Survey (RASS) Bright
and Faint Source Catalogs (RASSBSC and RASSFSC). The combination using a
matching radius of 50 arcseconds results in 836 eclipsing binaries that
display coronal activity and is the largest sample of active binary stars
assembled to the date of publication. By using the (V-I) colors of the ASAS
eclipsing binary catalog, the authors are able to determine the distances and
thus bolometric luminosities for the majority of eclipsing binaries that
display significant stellar activity. A typical value for the ratio of soft
X-ray to bolometric luminosity is LX/Lbol ~ a few x 10-4, similar to
the ratio of soft X-ray to bolometric flux FX/Fbol in the most active
regions of the Sun. Unlike rapidly rotating isolated late-type dwarfs - stars
with significant outer convection zones - a tight correlation between Rossby
number and activity of eclipsing binaries is absent. The authors find
evidence for the saturation effect and marginal evidence for the so-called
"super-saturation" phenomena. Their work shows that wide-field stellar
variability searches can produce a high yield of binary stars with strong
coronal activity.
The authors expect that only 1.4% (i.e., 12 out of 836) of the matches
between the ASAS eclipsing binary and RASS sources will be false given their
maximum angular separation criterion of 50 arcseconds. This Browse table
excludes 29 contact binaries for which the separate distance estimates made
by the authors using the source V-band and I-band magnitudes differed by more
than 20%, and hence contains 807 (836 - 29) eclipsing and X-ray emitting
binary systems.
Complete information on ASAS and its freely accessible data are available at
the ASAS web site: http://www.astrouw.edu.pl/asas/.
RASSASASPV Catalog
Photometric data from the All-Sky Automatic Survey (ASAS) - South
(Declination less than 29 degrees) Survey have been used for the
identification of bright stars located near the sources from the ROSAT All
Sky Survey Bright Source Catalog (RASSBSC). In total, 6,028 stars brighter
than 12.5 magnitude in the I- or the V-bands have been selected and analyzed
for periodicity. Altogether, 2,302 variable stars have been found with
periods ranging from 0.137 days to 193 days. Most of these stars have X-ray
emission of coronal origin, but there are a few cataclysmic binaries and
early type stars with colliding winds. Whenever it was possible, the authors
collected data available in the literature so as to verify the periods and to
classify variable objects.
The catalog includes 1,936 stars (1,233 new) considered to be variable due to
presence of spots (rotationally variable), 127 detached eclipsing binary
stars (33 new), 124 contact binaries (11 new), 96 eclipsing stars with
deformed components (19 new), 13 ellipsoidal variables (4 new), 5
miscellaneous variables and one pulsating RR Lyr type star (blended with an
eclipsing binary). More than 70% of the new variable stars have amplitudes
smaller than 0.1 magnitudes, but for the star ASAS 063656-0521.0 the authors
have found the largest known amplitude of brightness variations due to the
presence of spots (up to Delta V = 0.8 magnitudes).
RASSBSC Catalog
The ROSAT All-Sky Survey Bright Source Catalog (RASS-BSC, revision 1RXS) was
released online at http://www.xray.mpe.mpg.de/rosat/survey/rass-bsc/ (cf. IAU
Circular No. 6420, June 19, 1996). It has been superseded by the
Second ROSAT All-Sky Survey Point Source Catalog (2RXS).
This catalog was derived from the all-sky survey performed during the first
half year of the ROSAT mission in 1990-1991; 18,811 sources are catalogued,
with a limiting ROSAT PSPC countrate of 0.05 cts/s in the energy band 0.1-
2.4 keV. The sources have a detection likelihood of at least 15 and contain
at least 15 source photons. At a brightness limit of 0.1 cts/s (8547 sources),
the catalog represents a sky coverage of 92 percent.
The ROSAT name, the position in equatorial coordinates, the positional error,
the source countrate and error, the background countrate, exposure time,
hardness-ratios HR1 and HR2 and errors, extent and likelihood of extent, and
likelihood of detection are provided for each source. For 94 percent of the
sources, visual inspection confirmed the results of the standard processing
with respect to existence and position; the remaining 6 percent were
reanalyzed and appropriately flagged. Broadband images are available for a
subset of the flagged sources.
RASSBSCPGC Catalog
In a correlation study of the ROSAT All-Sky Survey Bright Source Catalog
(RASS-BSC, CDS Cat. <XI/10>, the HEASARC table RASSBSC) with the Catalogue of
Principal Galaxies (PGC, CDS Cat. <VII/119>, the HEASARC table PGC2003), 904
X-ray sources were found that possess possible extragalactic counterparts
within a search radius of 100 arcseconds. A visual screening process was
applied to classify the reliability of the correlations. 547 correlations
have been quoted as reliable identifications. From these, 349 sources are
known to be active galaxies. Although for the other sources no hints for
activity were found in the literature, 69% of those for which we have
distances show X-ray luminosities exceeding those of normal galaxies, a clear
sign that these galaxies also own hitherto unreported X-ray active
components. Some objects are located inside or in the direction of a known
group or cluster of galaxies. Their X-ray flux may therefore be in part
affected by hot gas emission. In the paper, luminosity and log N-log S
distributions are used to characterize different subsamples. Nuclei that are
both optically and X-ray active are found predominantly in spirals. Two
special source samples are defined, one with candidates for X-ray emission
from hitherto unknown groups or clusters of galaxies, and one with high X-ray
luminosity sources, that are likely candidates to possess hitherto unreported
active galactic nuclei. Besides a compilation of X-ray and optical
parameters, X-ray overlays on optical images for all the objects are also
supplied as part of this work.
This table contains 1124 optical galaxy entries for the 904 relevant X-ray
candidates/counterparts from the RASS. Besides a compilation of X-ray and
optical parameters for each source, the results of an identification
screening are also given. The 904 optical images with X-ray overlay contours
(xID_nnn.ps.gz) used in the screening process are added for each user's own
judgement of the reliability of the associations.
RASSCALS Catalog
This table contains the catalog from the ROSAT All-Sky Survey (RASS) Center
for Astrophysics (CfA) Loose Systems, or RASSCALS, the largest X-ray and
optical survey of low-mass galaxy groups as of its publication date in 2000.
The authors drew 260 groups from the combined Center for Astrophysics and
Southern Sky Redshift Surveys, covering one-quarter of the sky to a limiting
Zwicky magnitude of mz = 15.5. They detected 61 groups (23%) as extended
X-ray sources. The X-ray detections have a median membership of nine
galaxies, a median recession velocity cz = 7250 km/s, a median projected
velocity dispersion sigma(p) = 400 km/s, and a median X-ray luminosity L(x) =
3 x 1042 /h(100)2 erg/s, where the Hubble constant is H(0) = 100 h(100)
km/s/Mpc.
The data in this table replace the preliminary analysis of the X-ray data
which was presented in Mahdavi et al., 1999, ApJ, 518, 69 (CDS Cat.
<J/ApJ/518/69>.
RASSCNDINS Catalog
Using new and archival observations made with the Swift satellite and other
facilities, the authors examine 147 X-ray sources selected from the ROSAT
All-Sky-Survey Bright Source Catalog (RASS/BSC) to produce a new limit on the
number of isolated neutron stars (INSs) in the RASS/BSC, the most
constraining such limit to date. Independent of X-ray spectrum and
variability, the number of INSs is <= 48 (90% confidence). Restricting
attention to soft (kTeff < 200 eV), non-variable X-ray sources - as in a
previous study - yields an all-sky limit of <= 31 INSs. In the course of
their analysis, the authors identify 5 new high-quality INS candidates for
targeted follow-up observations. A future all-sky X-ray survey with eROSITA,
or another mission with similar capabilities, can be expected to increase the
detected population of X-ray-discovered INSs from the 8 - 50 in the BSC, to
(for a disk population) 240 - 1500, which will enable a more detailed study
of neutron star population models.
Following selection of the INS candidates, short (~ 1 ks) follow-up
observations with Swift/XRT were obtained for 92 of the candidates; these
observations decreased the X-ray positional uncertainty (the systematic
positional error associated with Swift blind pointing observations is on the
order of 3.5"). The authors obtained (where possible) contemporaneous UV
observations with Swift/UVOT for counterpart identification with off-band
objects.
RASSCNS3 Catalog
This catalog presents X-ray data for all entries in the Third
Catalogue of Nearby Stars (CNS3: Gliese and Jahreiss, 1991, ADC/CDS Cat.
<V/70>) that have been detected as X-ray sources in the ROSAT All-Sky Survey
(RASS). The catalog contains 1252 entries, yielding an average detection rate
of 32.9 percent of the 3802 CNS3 stars. In addition to count rates, source
detection parameters, X-ray hardness ratios, and X-ray fluxes, X-ray
luminosities derived from Hipparcos parallaxes are also listed.
For a star to have been considered by the authors to have been detected as
an X-ray source in the RASS, an X-ray source with an existence likelihood of
7 or more (equivalent to a source existence probablity of 99.9 percent or
more) had to lie within 90 arcseconds of its 1990 epoch CNS3 position. The
choice of this cut-off radius was based on a Monte Carlo simulation of about
the same number of random positions that were used as input positions. At an
offset of 90 arcseconds between the optical and X-ray positions the probability
that the X-ray source is attributable to the star and not to a unrelated
background object is 50 percent; this probability increases very rapidly for
smaller values of the offset, notice.
RASSDSSAGN Catalog
This table contains further results of a program aimed at yielding ~ 104
fully characterized optical identifications of ROSAT X-ray sources. The
program employs X-ray data from the ROSAT All Sky Survey (RASS) and both
optical imaging and spectroscopic data from the Sloan Digital Sky Survey
(SDSS). RASS/SDSS data from 5740 deg2 of sky spectroscopically covered in
SDSS Data Release 5 (DR5) provide an expanded catalog of 7000 confirmed
quasars and other active galactic nuclei (AGN) that are probable RASS
identifications. Again, in this expanded catalog the identifications as X-ray
sources are statistically secure, with only a few percent of the SDSS AGNs
likely to be randomly superposed on unrelated RASS X-ray sources. Most
identifications continue to be quasars and Seyfert 1 galaxies with 15 < m <
21 and 0.01 < z < 4, but the total sample size has grown to include very
substantial numbers of even quite rare AGN, e.g., it now includes several
hundreds of candidate X-ray-emitting BL Lac objects and narrow-line Seyfert 1
galaxies. In addition to exploring rare subpopulations, such a large total
sample may be useful when considering correlations between the X-ray and the
optical and may also serve as a resource list from which to select the
``best'' object (e.g., the X-ray-brightest AGN of a certain subclass at a
preferred redshift or luminosity) for follow-up X-ray spectral or alternate
detailed studies.
Much more information on the SDSS is available at the project's web site
at http://www.sdss.org/.
RASSDSSTAR Catalog
The ROSAT All-Sky Survey (RASS) was the first imaging X-ray survey of the
entire sky. Combining the RASS Bright and Faint Source Catalogs yields an
average of about three X-ray sources per square degree. However, while X-ray
source counterparts are known to range from distant quasars to nearby M
dwarfs, the RASS data alone are often insufficient to determine the nature of
an X-ray source. As a result, large-scale follow-up programs are required to
construct samples of known X-ray emitters. The authors use optical data
produced by the Sloan Digital Sky Survey (SDSS) to identify 709 stellar X-ray
emitters cataloged in the RASS and falling within the SDSS Data Release 1
footprint. Most of these are bright stars with coronal X-ray emission
unsuitable for SDSS spectroscopy, which is designed for fainter objects (g >
15mag). Instead, the authors use SDSS photometry, correlations with the Two
Micron All Sky Survey (2MASS) and other catalogs, and spectroscopy from the
Apache Point Observatory 3.5 m telescope to identify these stellar X-ray
counterparts. Their sample of 707 X-ray-emitting F, G, K, and M stars is one
of the largest X-ray-selected samples of such stars. The authors derive
distances to these stars using photometric parallax relations appropriate for
dwarfs on the main sequence, and use these distances to calculate their X-ray
luminosities LX. They also identify a previously unknown cataclysmic
variable (CV) as a RASS counterpart.
Much more information on the SDSS is available at the project's web site at
http://www.sdss.org/.
RASSDWARF Catalog
This catalog presents X-ray data for all the main-sequence and
subgiant stars of spectral types A, F, G, and K and luminosity classes IV and
V listed in the Bright Star Catalogue (also known as the HR Catalogue) that
have been detected as X-ray sources in the ROSAT All-Sky Survey (RASS).
A number of stars in the appropriate spectral type range that do not have
assigned luminosity classes have also been included. The catalogue contains
980 such HR stars detected as X-ray sources out of a total of 3054 stars in the
HR Catalogue that satisfy the selection criteris, implying an average detection
rate of 32%. In addition to the measured ROSAT PSPC count rates,
source detection parameters, hardness ratios, and X-ray fluxes,
X-ray luminosities derived from Hipparcos parallaxes are also listed.
RASSEBCS Catalog
This table contains the ROSAT All-Sky Survey (RASS) Brightest Cluster Sample
(BCS) and the Low-Flux Extension, which together form the Extended BCS
(eBCS). The main BCS, which was presented in Ebeling et al. (1998, MNRAS,
301, 881; Paper I), is a 90% flux-complete sample of the 201 X-ray-brightest
clusters of galaxies in the northern hemisphere (Dec >=0 degrees), at high
Galactic latitudes (|b| >= 20 degrees), with measured redshifts z <= 0.3 and
X-ray fluxes higher than 4.4 x 10-12 erg/cm2/s in the 0.1 - 2.4 keV band.
This sample, called the ROSAT Brightest Cluster Sample, is selected from RASS
data and is the largest X-ray-selected cluster sample compiled to the
publication date (1998). In addition to Abell clusters which form the bulk of
the sample, the BCS also contains the X-ray-brightest Zwicky clusters and
other clusters selected from their X-ray properties alone. Effort has been
made to ensure the highest possible completeness of the sample and the
smallest possible contamination by non-cluster X-ray sources. X-ray fluxes
were computed using an algorithm tailored for the detection and
characterization of X-ray emission from galaxy clusters. These fluxes are
accurate to better than 15% (mean 1-sigma error).
The low-flux extension of the X-ray-selected ROSAT Brightest Cluster Sample
was published in Ebeling et al. (2000, MNRAS, 318, 333; Paper IV). Like the
original BCS and employing an identical selection procedure, the BCS
extension is compiled from ROSAT All-Sky Survey (RASS) data in the northern
hemisphere (Dec >=0 degrees) and at high Galactic latitudes (|b| >= 20
degrees). It comprises 99 X-ray-selected clusters of galaxies with measured
redshifts z <= 0.3 (as well as eight more at z > 0.3) and total fluxes
between 2.8 x 10-12 and 4.4 x 10-12 erg/cm2/s in the 0.1 - 2.4keV band
(the latter value being the flux limit of the original BCS). The extension
can be combined (as it has been in this HEASARC table) with the main sample
published in 1998 to form the homogeneously selected extended BCS (eBCS), the
largest and statistically best understood cluster sample to emerge from the
RASS to date. The nominal completeness of the combined sample (defined with
respect to a power-law fit to the bright end of the BCS log N -log S
distribution) is relatively low at 75% (compared with 90% for the high-flux
sample of Paper I). However, just as for the original BCS, this
incompleteness can be accurately quantified, and thus statistically corrected
for, as a function of X-ray luminosity and redshift. In addition to its
importance for improved statistical studies of the properties of clusters in
the local Universe, the low-flux extension of the BCS is also intended to
serve as a finding list for X-ray-bright clusters in the northern hemisphere
which the authors hoped will prove useful in the preparation of cluster
observations to be made with the next generation of X-ray telescopes such as
Chandra and XMM-Newton.
RASSFIRST Catalog
This table contains a subset of the results of a correlation of the ROSAT
All-Sky Survey (RASS) with the April 1997 release of the VLA 20-cm Faint
Images of the Radio Sky at Twenty cm (FIRST: CDS Cat. <VIII/59>) Catalog. It
focusses on the analysis of the 843 X-ray sources which have unique radio
counterparts. The majority of these objects (84%) have optical counterparts
on the POSS 1 plates. Approximately 30% have been previously classified and
the authors obtain new spectroscopic classifications for 85 sources by
comparison with the ongoing FIRST Bright Quasar Survey and 106 additional
sources from their own new spectroscopic data. Approximately 51% of the
sources are presently classified, and the majority of the unclassified
objects are optically faint. The newly classified sources are generally radio
weak, exhibiting properties intermediate with previous samples of radio- and
X-ray-selected AGN. This also holds for the subsample of 71 BL Lacs which
includes many intermediate objects. The 146 quasars show no evidence for a
bimodal distribution in their radio-loudness parameter, indicating that the
supposed division between radio-quiet and radio-loud AGN may not be real. The
X-ray and radio luminosities are correlated over two decades in radio
luminosity, spanning the radio-loud and radio-quiet regimes, with radio-quiet
quasars showing a linear correlation between the two luminosities. Many of
the sources show peculiar or unusual properties which call for more detailed
follow-up observations. In their paper (Table 2), the authors also give the
X-ray and radio data for the 518 X-ray sources for which more than one radio
object is found. Because of the difficulties inherent in identifying optical
counterparts to these complex sources, they do not consider these data in the
current analysis, and they are not included in the present table (but are
available at http://cdsarc.u-strasbg.fr/ftp/cats/J/A+A/356/445/).
RASSFSC Catalog
The ROSAT All-Sky Survey Faint Source Catalog (RASS-FSC)
was first released by the Max-Planck-Institut fuer extraterrestrische Physik,
Garching group (voges et al. 2000) in May 2000. It is derived from the
All-Sky Survey performed during the ROSAT mission using the Position-Sensitive
Proportional Counter (PSPC) in the energy range 0.1 to 2.4 keV. Over
one hundred thousand (105,924 to be exact) sources are catalogued herein,
representing the faint extension of the RASS Bright Source Catalog (RASS-BSC,
cf. IAU Circular 6420 and Voges et al. 1999, A&A, 349, 389: this is also
available at the HEASARC as the RASSBSC database). The sources in this
catalog have a detection likelihood of at least seven, and contain at least
six source photons. The likelihood L of source detection is defined as
L = -ln (1 - P), where P = the probability of source detection.
For each source, the ROSAT name, position and positional error, the source
count rate and error, the background count rate, the exposure time,
the date of observation, two hardness ratios and their associated errors,
the source extent and the extent likelihood, and the likelihood of
source detection are given, inter alia.
RASSGB Catalog
5-GHz high-resolution VLA observations of 2,127 radio and X-ray emitting
sources found in both the Green Bank (GB) 5-GHz radio catalog and the ROSAT
All-Sky Survey (RASS) are presented. This is referred to as the RASS/Green
Bank sample: the HEASARC has abbreviated this to RASSGB to conform with the
naming convention that we have used for other RASS catalogs (notice the
catalog authors use the rather shorter acronym of RGB. Core flux densities
and positions accurate to +/- 0.5" are reported, as well as the GB
measurements of the total radio emission, for each source. Because of the
radio and X-ray selection criteria adopted, this catalog is believed to
almost exclusively contain radio- and X-ray-loud active galaxies. These data
are used in the paper by Laurent-Muehleisen et al. (1997) that contains the
published version of this catalog to derive the core-to-lobe ratio of objects
in this sample, and to discuss their core-dominance relative to samples of
radio galaxies and BL Lac objects: the authors conclude that this sample is
approximately an order of magnitude more core-dominated than the radio galaxy
sample, but is more than an order of magnitude less core-dominated than
highly-beamed BL Lac objects.
The published version of this catalog comprised two main tables, Table 2 and
Table 3. Table 2 gave the 5-GHz high resolution radio source properties for
the 1861 ROSAT/Green Bank sources for which subarcsecond positions and core
radio flux densities had been obtained, while Table 3 gave the 5-GHz radio
source properties for the 436 ROSAT/Green Bank sources for which only low
resolution data were obtained. A table of the 83 ROSAT/Green Bank sources for
which no radio source greater than 5 sigma was observed in the follow-up VLA
observations (Table 4 in the paper) is not included in the present HEASARC
RASSGB Catalog but is available in data archive at
https://heasarc.gsfc.nasa.gov/FTP/heasarc/dbase/misc_files/rassgb/
RASSGIANT Catalog
The ROSAT All-Sky Survey Catalogue of Optically Bright Late-Type
Giant and Supergiant Stars contains X-ray data for all late-type (spectral
types of A through M, inclusive) giants and supergiants (luminosity classes of
I through III-IV, inclusive) listed in the Bright Star Catalogue (BSC) that
have been detected in the ROSAT All-Sky Survey. The RASS giants and supergiants
catalog contains 450 entries of X-ray emitting, evolved late-type stars, which
corresponds to an average detection rate of 11.7 percent. For each star, the
ROSAT PSPC count rate, the hardness ratio, the apparent X-ray flux (calculated
using an individual energy-conversion-factor based on the hardness ratio), and
the ratio of X-ray to bolometric flux are given. The full details of the data
selection, the source detection criteria, etc., are given in the paper by
Huensch, Schmitt and Voges (1998, A&AS, 127, 251) describing this catalog;
essentially for a star to be identified as an X-ray source, the X-ray source
had to have at least a 99.9 percent existence probability, corresponding to
a likelihood of greater than or equal to 7, and lie within 90 arcseconds
of the optical position. Given the number of sky locations examined and
the total number of RASS sources, it is expected that of order 27.4 of the
450 claimed associations in this catalog will be chance coincidences.
RASSHGSFT2 Catalog
This table contains a summary of spectroscopic identifications of bright soft
high-galactic-latitude X-ray sources from the ROSAT All-Sky Survey (RASS)
with total PSPC count rates 0.11 < CR < 0.5 cts/s and hardness ratios HR1 < 0.
This study supplements the identification program of a complete sample of
sources with CR >= 0.5 cts/s presented previously (Thomas et al. 1998, A&A,
335, 467; available at the HEASARC as the RASSHGSOFT table). Spectroscopic
identifications are presented for 70 of 77 sources, 5 sources are identified
by other means, and subsidiary information is given for 2 as yet unidentified
sources. In practically all cases, a unique optical counterpart exists. As
for the brighter fraction of the sample, the largest source classes are
Seyfert 1 galaxies, magnetic cataclysmic variables, and hot white dwarfs. In
the Galactic Pole caps at |b| > 40 degrees, Seyfert galaxies dominate,
whereas at intermediate latitudes galactic objects as magnetic cataclysmic
variables and white dwarfs become relatively more frequent.
RASSHGSOFT Catalog
A summary of spectroscopic identifications is presented for a complete sample
of bright, soft, high galactic-latitude X-ray sources drawn from the ROSAT
All-Sky Survey (RASS) which have PSPC count-rates CR>0.5cts/s, hardness
ratios HR1<0, and galactic latitudes |b| > 20 degrees. Out of a total of 397
sources, 270 had previously catalogued counterparts, although most of these
were not previously known as X-ray sources; of the remaining 127 sources
neither X-ray nor optical properties were previously known. Of the whole
sample of very soft X-ray sources 155 were also discovered by the
Wide-Field-Camera on board ROSAT. Spectroscopic identifications are presented
for 108 sources and other identifications for a further 18 sources; 1 source
remains unidentified so far. In practically all cases a unique optical
counterpart exists, facilitating identification. The largest source classes
are AGN, magnetic cataclysmic variables, and hot white dwarfs
RASSMASTER Catalog
This database table contains the list German ROSAT All-Sky Survey
observations which were obtained during the ROSAT All-Sky Survey phase
(1990 July 30 to 1991 Jan 25) and which have become available to the
public. These data were obtained in scanning mode and therefore an
individual dataset covers a much larger area of the sky than do pointed
moded observations. In addition all these data were obtained with PSPC-C,
while all pointed mode observations after the end of the All-Sky Survey
were obtained with PSPC-B.
For each observation listed in this database table, the instrument used,
processing site, and coordinates of the field center are given, as well as
the ROSAT observation request number (ROR), actual exposure time, date the
observation took place, and more.
For details about the ROSAT instruments, consult the ROSAT Mission
Description (NASA Research Announcement for ROSAT, Appendix F and its
addendum) and the ROSAT GSFC GOF website at
http://heasarc.gsfc.nasa.gov/docs/rosat/rosgof.html for more information.
For more information about the ROSAT All Sky Survey, see the ROSAT All Sky
Survey page at http://www.xray.mpe.mpg.de/cgi-bin/rosat/rosat-survey.
RASSNORSAM Catalog
This table contains a completely identified sample of northern
ROSAT All-Sky Survey (RASS) X-ray sources, as well as some additional X-ray
sources which either had count rates below the adopted limits or were
located outside the boundaries of the study areas. It is a catalog of optical
identifications of a representative sample of northern (declination
> -9 degrees) RASS sources. A full identification has been carried out for
a count-rate- and area-limited complete RASS subsample comprising 674
sources. All sources are within six study areas outside the galactic plane
(absolute galactic latitude |b| > 19.6 degrees), one area being near the
North Galactic Pole and one near the North Ecliptic Pole.
RASSOB Catalog
For detailed statistical analysis of the X-ray emission of hot stars, stars of
spectral type O and B listed in the Yale Bright Star Catalogue were selected
and searched for in the ROSAT All-Sky Survey. This database table displays a
compilation of the derived X-ray data for a complete sample of bright OB stars.
RASSSDSSGC Catalog
The authors use ROSAT All-Sky Survey (RASS) broad-band X-ray images and the
optical clusters identified from the Sloan Digital Sky Survey Data Release 7
(SDSS DR7) to estimate the X-ray luminosities around ~65,000 candidate galaxy
clusters with masses >~1013 h-1 Msun based on an optical to X-ray (OTX)
code that they developed. They obtain a catalog with X-ray luminosities for
all 64,646 clusters. A total of 34,522 (~53%) of these clusters have a
signal-to-noise ratio S/N > 0 after subtracting the background signal.
According to the reference paper (but see HEASARC Caveats section below),
this catalog contains 817 clusters (473 at redshift z <= 0.12) with S/N > 3
for their X-ray detections (an additional 12,629 clusters have 3 >= S/N > 1
and 21,076 clusters have 1 >= S/N > 0). The authors find about 65% of these
X-ray clusters have their most massive member located near the X-ray flux
peak; for the remaining 35%, the most massive galaxy is separated from the
X-ray peak, with the separation following a distribution expected from a
Navarro-Frenk-White profile. In the reference paper, the authors investigate
a number of correlations between the optical and X-ray properties of these
X-ray clusters, and find that the cluster X-ray luminosity is correlated with
the stellar mass (luminosity) of the clusters, as well as with the stellar
mass (luminosity) of the central galaxy and the mass of the halo, although
the scatter in these correlations is large. Comparing the properties of X-ray
clusters of similar halo masses but having different X-ray luminosities, they
find that massive haloes with masses >~1014 h-1 Msun contain a larger
fraction of red satellite galaxies when they are brighter in X-ray. An
opposite trend is found in central galaxies in relative low-mass haloes with
masses <~1014 h-1 Msun where X-ray brighter clusters have smaller
fraction of red central galaxies. Clusters with masses >~1014 h-1 Msun
that are strong X-ray emitters contain many more low-mass satellite galaxies
than weak X-ray emitters. These results are also confirmed by checking X-ray
clusters of similar X-ray luminosities but having different characteristic
stellar masses. The cluster catalog containing the optical properties of
member galaxies and the X-ray luminosity is also available at
http://gax.shao.ac.cn/data/Group.html.
The optical data used in this analysis are taken from the SDSS galaxy group
catalogs of Yang et al. (2007, ApJ, 671, 153), constructed using the adaptive
halo-based group finder of Yang et al. (2005, MNRAS, 356, 1293), here updated
to DR7. The parent galaxy catalog is the New York University Value-Added
Galaxy Catalog (NYU-VAGC; Blanton et al. 2005, AJ, 129, 2562) based on the
SDSS DR7 (Abazajian et al. 2009, ApJS, 182, 543), which contains an
independent set of significantly improved reductions.
In this study, the authors adopt a Lambda cold dark matter cosmology whose
parameters are consistent with the 7-year data release of the WMAP mission:
Omegam = 0.275, OmegaLambda = 0.725, h = H0/(100 km s-1 Mpc-1) =
0.702, and sigma8 = 0.816.
RASSUSNOID Catalog
The authors have quantitatively cross-associated the 18,811 ROSAT
All-Sky Survey Bright Source Catalog (RASS/BSC) X-ray sources with optical
sources in the USNO A-2 catalog, calculating the probability of unique
association (P_id) between each candidate within 75" of the X-ray source
position, on the basis of optical magnitude and proximity. They have
generated catalogs of RASS/BSC sources for which P_id > 98%, P_id > 90%, and
P_id > 50%, which contain 2705, 5492, and 11,301 unique USNO A-2 optical
counterparts respectively down to the stated level of significance. Together
with identifications of objects not cataloged in USNO A-2 due to their high
surface brightness (M31, M32, ...) and optical pairs, they produced a total of
11,803 associations to a probability of P_id > 50%. They also include in this
catalog a list of objects in the SIMBAD database within 10" of the USNO A-2
position, as an aid to identification and source classification. This is the
first RASS/BSC counterpart catalog which provides a probability of association
between each X-ray source and counterpart, quantifying
the certainty of each individual association. The catalog is more useful than
previous catalogs which either rely on plausibility arguments for association
or do not aid in selecting a counterpart between multiple off-band sources in
the field. Sources of high probability of association can be separated out, to
produce high-quality lists of classes (Seyfert 1/2s, QSOs, RS CVns) desired
for targeted study, or for discovering new examples of known classes (or new
classes altogether) through the spectroscopic classification of securely
identified but unclassified USNO A-2 counterparts. Low P_id associations can
be used for statistical studies and follow-on investigation - for example,
performing follow-up spectroscopy of the many low-mass stars to search for
signatures of coronal emission, or to investigate the relationship between
X-ray emission and classes of sources not previously well-studied for their
X-ray emissions (such as pulsating variable stars). The authors find that a
fraction ~65.8% of RASS/BSC sources have an identifiable optical counterpart,
down to the magnitude limit of the USNO A-2 catalog which could be identified
by their spatial proximity and high optical brightness.
RASSVARS Catalog
The RASS X-Ray Variable Sources Catalog contains the results of
a systematic search for variability among the ROSAT All-Sky Survey (RASS)
X-ray sources. Lightcurves were generated for about 30,000 X-ray point sources
which were detected sufficiently high above the background. For the
variability study different search algorithms were developed in order
to recognize flares, periods and trends, respectively. The variable X-ray
sources were optically identified with counterparts in the SIMBAD, the
USNO-A2.0 and NED data bases, but a significant part of the X-ray sources
remain without cataloged optical counterparts. A complete list of the 1207
X-ray variable sources that were found is presented in this table.
RASSWD Catalog
This database table lists all white dwarf stars, both previously-cataloged and
newly discovered, which have been detected in the ROSAT All-Sky Survey. The
positions and count rates of the X-ray sources associated with each star
are given, as well as spectral types and other star names for those stars
which have been previously cataloged. This database table also lists distances
estimated via Balmer line profile fitting, corrected (for IS absorption)
X-ray luminosities, and each star's contribution to the X-ray luminosity
function for all DA white dwarfs which were detected in the ROSAT All-Sky
Survey.
RBS Catalog
The ROSAT Bright Survey (RBS) is an identification program of the more than
2000 X-ray sources at high galactic latitude (absolute latitude b > 30
degrees) with a count rate of more than 0.2 ct/s detected during the ROSAT
All-Sky Survey (Voges et al. 1999, A&A, 349, 389). The RBS identification
program is more than 99.5% complete. A sub-sample of 931 sources with a count
rate of more than 0.2 ct/s in the hard spectral band from 0.5 to 2.0 keV is
100% identified. The total survey area comprises 20391 square degrees at a
flux limit of 2.4 x 10-12 erg/s/cm2 in the 0.5 to 2.0 keV band. About
1500 sources of the complete sample were identified by correlating the RBS
with the SIMBAD and NED databases. The remaining ~500 sources were identified
by low-resolution optical spectroscopy and CCD imaging utilizing various
telescopes. The RBS Catalog contains optical and X-ray information for each
source, including the most massive complete sample of X-ray selected AGN ever
assembled, with a total of 669 members, and a well-populated X-ray selected
sample of 302 clusters of galaxies with redshifts of up to 0.52. Three X-ray
sources in the RBS remain without optical counterparts, RBS 378, RBS 1223,
and RBS 1556. While the first is a possible X-ray transient, the latter two
sources are isolated neutron star candidates (Motch et al. 1999, A&A, 351,
177; Schwope et al. 1999, 341, L51). As noted elsewhere, this electronic
version of the RBS Catalog has a small number of additions/corrections
compared to the published version.
RBSCNVSS Catalog
By cross-identifying the RASS (ROSAT All-Sky Survey) Bright
Source Catalog (RBSC, CDS Catalog IX/10) with the NRAO VLA Sky Survey
(NVSS, CDS Catalog VIII/65), the authors have constructed the
RBSC-NVSS sample of the brightest X-ray sources (>= 0.1 counts/s ~ 10-12
erg/cm2/s in the 0.1 - 2.4keV band) that are also radio sources (S >= 2.5 mJy
at 1.4 GHz) in the 7.8 sr solid angle of extragalactic sky with galactic
latitude |b| > 15 degrees and declination > -40 degrees. The sky density of
NVSS sources is low enough that they can be reliably identified with RBSC
sources having rms positional uncertainties >= 10". The authors used the more
accurate radio positions to make reliable X-ray/radio/optical identifications
down to the POSS plate limits. They obtained optical spectra for many of
the bright identifications lacking published redshifts. The resulting
X-ray/radio sample is unique in its size (1557 objects), composition
(a mixture of nearly normal galaxies, Seyfert galaxies, quasars, and
clusters), and low average redshift [<z>~0.1].
REFLEX Catalog
This table is the ROSAT-ESO Flux-Limited X-Ray (REFLEX) Galaxy Cluster Survey
Catalog. The REFLEX Cluster Survey provides information on the X-ray
properties, redshifts, and some identification details of clusters in the
REFLEX sample. The catalog describes a statistically complete X-ray
flux-limited sample of 447 galaxy clusters above an X-ray flux of 3 x 10-12
erg/s/cm2 (0.1 to 2.4 keV) in an area of 4.24 steradians in the southern
sky. The cluster candidates were first selected by their X-ray emission in
the ROSAT-All Sky Survey and subsequently spectroscopically identified in the
frame of an ESO key program. Previously described tests have shown that the
sample is more than 90% complete and there is a conservative upper limit of
9% on the fraction of clusters with a dominant X-ray contamination from AGN.
This data set is at present the largest, statistically complete X-ray galaxy
cluster sample. The sample forms the basis of several cosmological studies,
one of the most important applications being the assessment of the statistics
of the large-scale structure of the universe and the test of cosmological
models.
The X-ray luminosities and other distance-dependent cluster parameters are
calculated for a Lambda cosmology with a Hubble Constant H0 of 70 km/s/Mpc,
OmegaM of 0.3, and OmegaLambda of 0.7. The CDS version of this catalog
contains an additional table (reflex50.dat) with these parameters calculated
for an Einstein-de Sitter universe with H0 = 50 km/s/Mpc, OmegaM = 1.0,
and OmegaLambda = 0.0.
RIXOS Catalog
The ROSAT International X-Ray/Optical Survey (RIXOS) is a
medium-sensitivity survey and optical identification program for X-ray
sources which were discovered in ROSAT high Galactic latitude fields
(|b| > 28 degrees) and observed with the Position Sensitive Proportional
Counter (PSPC) detector. The survey made use of the central 17 arcmin of
each ROSAT field. A flux limit of 3 x 10-14 erg/s/cm2 (0.5-2.0 keV)
was adopted for this survey, and a minimum exposure time of 8000 seconds
was required for qualifying ROSAT observations. X-ray sources in the
survey are therefore substantially above the detection threshold of each
field used, and many contain enough counts to allow the X-ray spectral
slope to be estimated. Spectroscopic observations of potential counterparts
were obtained of all sources down to the survey limit in 64 fields,
totaling a sky area of 15.77 square degrees. Positive optical
identifications are made for 94% of the 296 sources thus examined.
A further 18 fields (4.44 sq deg), containing 105 sources above the
3 x 10-14 erg/s/cm2 survey limit, are completely optically identified
to a higher flux of 8 x 10-14 erg/s/cm2 (0.5-2.0 keV). Optical
spectroscopic data are supplemented by deep CCD imaging of many sources
to reveal the morphology of the optical counterparts, and objects too
faint to register on Sky Survey plates. The faintest optical counterparts
have R ~ 22.
This table contains the catalog of the RIXOS sources and their optical
identifications.
ROS400GCLS Catalog
This is a catalog of galaxy clusters detected in a new ROSAT PSPC
survey. The survey is optimized to sample, at high redshifts, the mass range
corresponding to T > 5 keV clusters at z = 0. Technically, our survey is the
extension of the 160 square degree survey (160d, the HEASARC Browse table
called ROSGALCLUS). The authors use the same detection algorithm, thus
preserving the high quality of the resulting sample; the main difference is
a significant increase in sky coverage. The new survey covers 397 square
degrees and is based on 1610 high Galactic latitude ROSAT PSPC pointings,
virtually all of the pointed ROSAT data that were suitable for the detection
of distant clusters. The search volume for X-ray luminous clusters within
z < 1 exceeds that of the entire local universe (z < 0.1). The authors
detected 287 extended X-ray sources with fluxes f_x > 1.4 x 10^-13 erg
s^-1 cm^-2 in the 0.5 - 2 keV energy band, of which 266 (93%) are optically
confirmed as galaxy clusters, groups or individual elliptical galaxies. The
paper from which this table is extracted provides a description of the input
data, the statistical calibration of the survey via Monte Carlo simulations,
and the catalog of detected clusters. The authors also therein compare the
basic results with those from previous, smaller area surveys and find good
agreement for the logN - log S distribution and the local X-ray luminosity
function. This sample clearly shows a decrease in the number density for
the most luminous clusters at z > 0.3. The comparison of these ROSAT-derived
fluxes with the accurate Chandra measurements for a subset of high-redshift
clusters demonstrates the validity of the 400 square degree survey's
statistical calibration.
This Browse table contains the main cluster catalog (Table 4 of the reference
paper) which comprises 242 serendipitously detected clusters of galaxies.
It does not include 24 clusters within a redshift of 0.01 of the redshift
of the target of the ROSAT observation (given in Table 5 of the reference
paper), as these latter are not entirely serendipitous, 5 noncluster extended
sources (given in Table 6 of the reference paper), nor 16 likely false X-ray
detections (given in Table 7 of the reference paper).
ROSATHARD Catalog
This table contains a catalog of 147 serendipitous X-ray sources selected to
have hard spectra (spectral indices Alpha < 0.5) from a survey of 188 ROSAT
fields. Such sources must be the dominant contributors to the X-ray
background at faint fluxes. The authors have used Monte Carlo simulations to
verify that their technique is very efficient at selecting hard sources: the
survey has >= 10 times as much effective area for hard sources as it has for
soft sources above a 0.5 - 2 keV flux level of 10-14 erg cm-2 s-1. The
distribution of best-fitting spectral slopes of the hard sources suggests
that a typical ROSAT hard source in this survey has a spectral slope Alpha ~
0. The hard sources have a steep number-flux relation (dN/dS ~ _S-Gamma,
with a best-fitting value of Gamma = 2.72 +/- 0.12), and make up about 15% of
all 0.5 - 2 keV sources with S > 10-14 erg cm-2 s-1. If their N(S)
continues to fainter fluxes, the hard sources will comprise ~ 40% of sources
with 5 x 10-15 < S < 10-14 erg cm-2 s-1. The population of hard
sources can therefore account for the harder average spectra of ROSAT sources
with S < 10-14erg cm-2 s-1. They probably make a strong contribution to
the X-ray background at faint fluxes and could be the solution to the X-ray
background spectral paradox.
ROSATLOG Catalog
The ROSATLOG database table has been created for the purpose of providing a
complete, accurate, and easily accessible record of ROSAT observations.
ROSATLOG is made by cross-correlating ROSAT observation records with the
short-term timeline and contains information about all pointings executed by
the satellite during the performance verification (PV) and AO phases. For
each observation, details are given concerning target name and coordinates,
pointing start and stop times, PI name and country, ROSAT Observation Request
sequence number, and more.
ROSATLOG is based on the short-term timelines and observation records
generated at the German ROSAT Science Data Center at the Max Planck Institute
for Extraterrestrial Physics (MPE) and sent to the ROSAT Guest Observer
Facility at Goddard Space Flight Center (GSFC).
ROSATRLQ Catalog
Brinkmann et al. (1997) have compiled a sample of all quasars with
measured radio emission from the Veron-Cetty - Veron catalog (1993, VERON93,
CDS/ADC Cat. VII/166) detected by ROSAT (i) in the ALL-SKY SURVEY (RASS, Voges
1992, in Proc. of the ISY Conference `Space Science', ESA ISY-3, ESA
Publications, p.9, ADC/CDS Cat. IX/10), (ii) as targets of pointed
observations, or (iii) as serendipitous sources from pointed observations, as
publicly available from the ROSAT point source catalog (ROSAT-SRC, Voges et
al. 1995, ADC/CDS Cat. IX/11). The total number of ROSAT
detected radio quasars from the above three sources is 654 objects. 69
of the objects are classified as radio-quiet using the defining line
at a radio-loudness of 1.0, and 10 objects have no classification. The
5GHz data are from the 87GB radio survey, the NED database, or from
the Veron-Cetty - Veron catalog. The power law indices and their
errors are estimated from the two hardness ratios given by the SASS
assuming Galactic absorption. The X-ray flux densities in the ROSAT
band (0.1-2.4keV) are calculated from the count rates using the energy
to counts conversion factor for power law spectra and Galactic
absorption. For the photon index, the authors used the value obtained for a
individual source if the estimated 1 sigma error was smaller than 0.5,
otherwise they used the mean value of 2.14.
ROSATRQQ Catalog
A sample of all radio-quiet quasars or quasars without radio
detection taken from the Veron-Cetty - Veron catalog (1993, VERON93,
ADC/CDS Cat. VII/166) which were either (i) detected by ROSAT in the ALL-SKY
SURVEY (RASS, Voges 1992, in Proc. of the ISY Conference `Space Science', ESA
ISY-3, ESA Publications, p.9, ADC/CDS Cat. IX/10), or (ii) detected as targets
of pointed observations, or (iii) detected as serendipitous sources in pointed
observations that were publicly available in the ROSAT point source catalog
(ROSATSRC, Voges et al. 1995, ADC/CDS Cat. IX/11), has been compiled by Yuan
et al. (1998, A&A, 330, 108). For all sources, they used the results
of the Standard Analysis Software System (SASS, Voges et al. 1992, in
Proc. of the ISY Conference `Space Science', ESA ISY-3, ESA
Publications, p.223), employing the most recent processing for the
Survey data (RASS-II, Voges et al. 1996, ADC/CDS Cat. IX/10). The total
number of quasars in this ROSAT Radio-Quiet Quasars Catalog is 846.
Sixty-nine of the radio-quiet objects with radio detections have
already been presented in a previous paper (Brinkmann, Yuan,
and Siebert 1997, Cat. J/A+A/319/413) using the RASS-I results.
Seventeen objects were found to be radio-loud from recent radio surveys and
were marked in the table. When available, the power law photon indices
and the corresponding absorption column densities (NH) were estimated
from the two hardness ratios given by the SASS, both with free fitted
NH and for Galactic absorption. The unabsorbed X-ray flux densities in
the ROSAT band (0.1-2.4keV) were calculated from the count rates using
the energy to counts conversion factor for power law spectra and
Galactic absorption. The authors used as the photon index the value obtained
for the individual source if the estimated 1-{sigma} error was smaller
than 0.5, otherwise they used the redshift-dependent mean value (see the
paper for details). Notice that the positions of sources in this catalog
are not the positions of the X-ray sources, but the optical positions of the
quasars as given in the VERON93 Catalog (Wolfgang Brinkmann, 1998
private communication).
ROSATXUV Catalog
We present a catalogue of XUV sources from observations by the Wide
Field Camera (WFC) on ROSAT during the pointed phase. The ROSAT WFC is
a telescope sensitive in the extreme UV range (17-210eV) which
observes in parallel with the ROSAT X-Ray Telescope (XRT). The 5916
pointed observations processed are from the calibration and
verification phase in June 1990 and from the period 9 Feb. 1991 to 15
July 1994. The catalogue contains 1022 independent source detections
which correspond to 328 individual sources, many of which have been
observed repeatedly. Each observation was done with one of four
filters S1, S2, P1 and P2. Of the 328 sources 113 are new sources
(they are not listed in the "2RE" catalogue) and 274 have been
identified with optical counterparts. The catalogue contains
coordinates, observed count rates, normalized source count rates and
the proposed optical counterpart with its spectral class.
ROSGALCLUS Catalog
This is a catalog of 203 clusters of galaxies serendipitously
detected in 647 ROSAT PSPC high Galactic latitude pointings covering 158 square
degrees. This is one of the largest X-ray-selected cluster samples, comparable
in size only to the ROSAT All-Sky Survey sample of nearby clusters (Ebeling
et al. 1997). Clusters in the inner 17.'5 of the ROSAT PSPC field of view are
detected using the spatial extent of their X-ray emission. Fluxes of detected
clusters range from 1.6 x 10^-14 to 8 x 10^-12 ergs s^-1 cm^-2 in the 0.5-2 keV
energy band. X-ray luminosities range from 10^42 ergs s^-1, corresponding to
very poor groups, to ~5 x 10^44 ergs s^-1, corresponding to rich clusters.
The cluster redshifts range from z = 0.015 to z > 0.5. The catalog lists X-ray
fluxes, core radii, and spectroscopic redshifts for 73 clusters and
photometric redshifts for the remainder. Of 223 X-ray sources, 203 have been
optically confirmed as clusters of galaxies. Of the remaining 20 sources, 19
are likely false detections arising from blends of unresolved point
X-ray sources. Optical identifications of the remaining object are hampered
by a nearby bright star. Above a flux of 2 x 10^-13 ergs s^-1 cm^-2, 98% of
extended X-ray sources are optically confirmed clusters. The number of false
detections and their flux distribution are in perfect agreement with
simulations. The log N-log S relation for clusters derived from this catalog
shows excellent agreement with counts of bright clusters derived from the
Einstein Extended Medium Sensitivity Survey and the ROSAT All-Sky Survey. At
fainter fluxes, its log N-log S relation agrees with the smaller area
WARPS survey. The cluster counts appear to be systematically higher than those
from a 50 square degree survey by Rosati et al.
ROSHRI Catalog
The ROSHRI data table contains a list of sources detected by the Standard
Analysis Software System (SASS) in reprocessed, public HRI datasets. In
addition to the parameters returned by SASS (like position, count rate,
signal-to-noise, etc.) each source in the table has associated with it a
set of source and sequence "flags." These flags are provided by the ROSAT
data centers in the US, Germany and the UK to help the user of the ROSHRI
database table quickly judge the reliability of a given source.
The ROSHRI table excludes sources that meet the following parameter criteria:
false_det = 'T' or deferred = 'T' or not_checked = 'T' or un_unique ='T'.
See the documentation below for descriptions of these parameters.
These data have been screened by ROSAT data centers in the US, Germany, and
the UK as a step in the production of the ROSAT Results Archive. The RRA
contains extracted source and associated products with an indication of
reliability for the primary parameters.
ROSHRITOTAL Catalog
The ROSHRITOTAL data table contains a list of sources detected by the Standard
Analysis Software System (SASS) in reprocessed, public HRI datasets. In
addition to the parameters returned by SASS (like position, count rate,
signal-to-noise, etc.) each source in the table has associated with it a
set of source and sequence "flags." These flags are provided by the ROSAT
data centers in the US, Germany and the UK to help the user of the ROSHRITOTAL
database table quickly judge the reliability of a given source.
The ROSHRITOTAL database table is a superset of the ROSHRI database table.
The ROSHRI table excludes sources that meet the following parameter criteria:
false_det = 'T' or deferred = 'T' or not_checked = 'T' or un_unique ='T'.
See the documentation below for descriptions of these parameters.
These data have been screened by ROSAT data centers in the US, Germany, and
the UK as a step in the production of the ROSAT Results Archive. The RRA
contains extracted source and associated products with an indication of
reliability for the primary parameters.
ROSMASTER Catalog
This database table contains the list of all Röntgen Satellite (ROSAT) X-Ray
Telescope (XRT) pointing-mode observations for which data sets are available,
i.e., it excludes the ROSAT All-Sky Survey observations. Users should consult
the RASSMASTER database table for those XRT observations which were made
in scanning mode during the ROSAT All-Sky Survey (RASS) phase (30 July 1990
to 25 January 1991, and 3 August 1991 to 13 August 1991).
For each observation listed in this table, parameters such as the focal-plane
instrument used, the data processing site, and the target name and coordinates
are given, as well as the ROSAT Observation Request (ROR) number, the actual
and requested exposure times, the date(s) on which the observation took place,
etc.
For details about the ROSAT instruments, consult the ROSAT Guest Observer
Facility (GOF) website at https://heasarc.gsfc.nasa.gov/docs/rosat/. A list
of the available online ROSAT documentation can be found at
https://heasarc.gsfc.nasa.gov/docs/rosat/rosdocs.html.
ROSNEPAGN Catalog
The ROSAT North Ecliptic Pole (NEP) Survey of Active Galactic Nuclei (AGN)
Catalog is an X-ray flux-limited sample of 219 AGN discovered in the
contiguous 80.7 square degrees region of the ROSAT North Ecliptic Pole (NEP)
Survey (Gioia et al. 2003, ApJS, 149, 29; CDS Cat. <J/ApJS/149/29>). This
catalog features complete optical identifications and spectroscopic
redshifts. The median redshift, X-ray flux, and X-ray luminosity are z =
0.41, fx = 1.1 x 10-13 erg/cm2/s, and Lx = 9.2 x 1043 h70-2 erg/s
(0.5 - 2.0 keV), respectively. Unobscured Type 1 AGN are the dominant
constituents (90%) of this soft X-ray-selected sample of AGN.
This catalog sample includes several notable revisions relative to previous
versions of the catalog (Mullis 2001, Ph. D. thesis, U. Hawaii; Gioia et al.
2003, ApJS, 149, 29, available in HEASARC Browse as the ROSNEPOID table).
Firstly, the AGN fluxes and luminosities previously reported were
overestimated by approximately 20% on average as a result of an error in the
conversion of X-ray count rate to flux. Secondly, the sample has grown by 1
because of the reclassification of one of the X-ray sources (RX
J1824.7+6509). Finally, in the present study the authors have adopted the
presently favored "concordance" cosmology in computing the X-ray
luminosities. The revised and updated catalog with corrected properties
presented here should be the reference point for any future work with the
ROSAT NEP AGN sample.
ROSNEPOID Catalog
This table contains the ROSAT North Ecliptic Pole (NEP) Survey
list of optical identifications. The X-ray data around the NEP from the ROSAT
All-Sky Survey (RASS) were used to construct a contiguous area survey which
consisted of a sample of 445 individual X-ray sources with fluxes more than
~2x10-14 erg/cm2/s in the 0.5 - 2.0 keV energy band. The NEP survey is
centered at RA= 18hr 00min Dec= +66deg 33', and covers a region of 80.7 square
degrees at a moderate Galactic latitude b= 29.8 degrees. Hence, the NEP survey
is as deep as and covers a comparable solid angle to the ROSAT serendipitous
surveys but is also contiguous. The authors identified 99.6% of the sources
and determined redshifts for the extragalactic objects.
This table contains the optical identifications for the NEP catalog of X-ray
sources, including basic X-ray data and properties of the sources. The
classification of the optical counterparts to the NEP sources is very similar
to that of previous surveys, in particular the Einstein Extended Medium
Sensitivity Survey (EMSS). The main constituents of the catalog are active
galactic nuclei (AGN) (~49%), either type 1 or type 2 according to the
broadness of their permitted emission lines. Stellar counterparts are
the second most common identification class (~34%). Clusters and
groups of galaxies comprise 14%, and BL Lacertae objects 2%. One
non-AGN galaxy and one planetary nebula have also been found. The NEP
catalog of X-ray sources is a homogeneous sample of astronomical
objects featuring complete optical identification.
The data on AGN in this catalog are essentially superceded by the data in the
more recent catalog of Mullis et al. (2004, ApJ, 617, 192), available in
HEASARC Browse as the ROSNEPOID table (q.v.), in which, inter alia, a
corrected count rate to flux conversion and a different cosmology were used.
ROSNEPXRAY Catalog
This table contains the ROSAT North Ecliptic Pole (NEP) Survey X-Ray Source
Catalog. The sky around the NEP, at RA (J2000.0) = 18h00m00s, Declination
(J2000.0) = +66d33'39", has the deepest exposure of the entire ROSAT All-Sky
Survey (RASS). The NEP is an undistinguished region of moderate Galactic
latitude, b = 29.8 degrees, and hence it is suitable for compiling
statistical samples of both Galactic and extragalactic objects. The authors
have made such a compilation in the 80.6 square degrees region surrounding
the NEP. Their sample fully exploits the properties of the RASS, since the
only criteria for inclusion are source position and significance, and it
yields the deepest large solid angle contiguous sample of X-ray sources to
date. They find 442 unique sources above a flux limit ~2 x 10-14 ergs
cm-2 s-1 in the 0.5-2.0 keV band. In this table, the X-ray properties of
these sources as determined from the RASS are presented. These include
positions, fluxes, spectral information in the form of hardness ratios, and
angular sizes.
ROSPRSPEC Catalog
The ROSPRSPEC table contains the proposal titles and abstracts
for all the accepted ROSAT proposals. Please refer to the ROSAO database table
for other proposal information.
ROSPSPC Catalog
The ROSPSPC database table contains a list of sources detected by the Standard
Analysis Software System (SASS) in public, unfiltered, pointed PSPC datasets.
In addition to the parameters returned by SASS (like position, count rate,
likelihood, etc.) each source in the table has associated with it a set of
source and sequence "flags." These flags are provided by the ROSAT data
centers in the US, Germany and the UK to help the user of the ROSPSPC
database table quickly judge the reliability of a given source.
The ROSPSPC table excludes sources that meet the following parameter criteria:
false_det = 'T' or deferred = 'T' or not_checked = 'T'. See the documentation
below for descriptions of these parameters.
The catalog consists of all primary source parameters from the automated
detection algorithm employed by the SASS. In addition each observation has
been quality checked, both by automatic algorithms and by detailed visual
inspection. The results of this quality checking are contained as a set of
logical-value flags for a set of principal source parameters. If a source
parameter is suspect, the associated flag is set to "TRUE"; parameters with
no obvious problems maintain the default, "FALSE", value.
ROSPSPCF Catalog
This table is derived from the Second ROSAT Source Catalog of Pointed
Observations with the ROSAT PSPC (Roentgen Satellite Position-Sensitive
Proportional Counter) Observed Using the Boron Filter, or the 2RXF Catalog.
2XRF contains arcsecond positions and count rates for 2,526 detected sources
from 258 ROSAT PSPC Filter observations covering 0.15% of the sky, including
704 high-confidence detections and 20 obvious sources which were not detected
by SASS.
The complete version of the list of detections (the HEASARC's
ROSPSPCFTOT) table contains 2,526 entries,
whereas the short 'high-confidence' version contained in this present table
has 704 detection. The ROSPSPCF table excludes sources that meet the
following parameter criteria: false_det = 'f' or deferred = 'D' or
not_checked = 'n'. See the documentation below for descriptions of these
parameters.
The catalog consists of all primary source parameters from the automated
detection algorithm employed by the SASS. In addition each observation has
been quality checked, both by automatic algorithms and by detailed visual
inspection. The results of this quality checking are contained as a set of
logical-value flags for a set of principal source parameters. If a source
parameter is suspect, the associated flag is set to a corresponding
alphabetical value; parameters with no obvious problems maintain the default,
'.', value.
The Second ROSAT Pointed PSPC Filter Source Catalog includes missing sources,
i.e. obvious sources which were not detected by the SASS source detection
software but which could be easily detected by visual inspection. Missed
sources are marked by negative values of their source identification number,
i.e. the parameter 'MPLSX_ID' has a negative value for these sources. The
only tabulated quantities for these visually identified missed sources are
source positions; other quantities (like count rates, hardness ratios, etc.)
are not available.
These data have been screened by ROSAT data centers in the US, Germany, and
the UK as a step in the production of the ROSAT Results Archive. The RRA
contains extracted source and associated products with an indication of
reliability for the primary parameters.
More information about the ROSAT mission and the SASS can be obtained from
the ROSAT User Handbook, available at
http://heasarc.gsfc.nasa.gov/docs/rosat/rosdocs.html
ROSPSPCFTOT Catalog
This table is derived from the Second ROSAT Source Catalog of Pointed
Observations with the ROSAT PSPC (Roentgen Satellite Position-Sensitive
Proportional Counter) Observed Using the Boron Filter, or the 2RXF Catalog.
2XRF contains arcsecond positions and count rates for 2,526 detected sources
from 258 ROSAT PSPC Filter observations covering 0.15% of the sky, including
704 high-confidence detections and 20 obvious sources which were not detected
by SASS.
This table contains the complete version of the list of detections (2,526
entries), whereas the short 'high-confidence' version (the HEASARC's
ROSPSPCF table) contains 704 detections. The
ROSPSPCFTOT table includes many questionable sources that meet the following
parameter criteria: false_det = 'f' or deferred = 'D' or not_checked = 'n'.
See the documentation below for descriptions of these parameters.
The catalog consists of all primary source parameters from the automated
detection algorithm employed by the SASS. In addition each observation has
been quality checked, both by automatic algorithms and by detailed visual
inspection. The results of this quality checking are contained as a set of
logical-value flags for a set of principal source parameters. If a source
parameter is suspect, the associated flag is set to a corresponding
alphabetical value; parameters with no obvious problems maintain the default,
'.', value.
The Second ROSAT Pointed PSPC Filter Source Catalog includes missing sources,
i.e. obvious sources which were not detected by the SASS source detection
software but which could be easily detected by visual inspection. Missed
sources are marked by negative values of their source identification number,
i.e. the parameter 'MPLSX_ID' has a negative value for these sources. The
only tabulated quantities for these visually identified missed sources are
source positions; other quantities (like count rates, hardness ratios, etc.)
are not available.
These data have been screened by ROSAT data centers in the US, Germany, and
the UK as a step in the production of the ROSAT Results Archive. The RRA
contains extracted source and associated products with an indication of
reliability for the primary parameters.
More information about the ROSAT mission and the SASS can be obtained from
the ROSAT User Handbook, available at
http://heasarc.gsfc.nasa.gov/docs/rosat/rosdocs.html
ROSPSPCTOTAL Catalog
The ROSPSPCTOTAL database table contains a list of sources detected by the Standard
Analysis Software System (SASS) in public, unfiltered, pointed PSPC datasets.
In addition to the parameters returned by SASS (like position, count rate,
likelihood, etc.) each source in the table has associated with it a set of
source and sequence "flags." These flags are provided by the ROSAT data
centers in the US, Germany and the UK to help the user of the ROSPSPCTOTAL
database table quickly judge the reliability of a given source.
The ROSPSPCTOTAL database table is a superset of the ROSPSPC database table.
The ROSPSPC table excludes sources that meet the following parameter criteria:
false_det = 'T' or deferred = 'T' or not_checked = 'T'. See the documentation
below for descriptions of these parameters.
The catalog consists of all primary source parameters from the automated
detection algorithm employed by the SASS. In addition each observation has
been quality checked, both by automatic algorithms and by detailed visual
inspection. The results of this quality checking are contained as a set of
logical-value flags for a set of principal source parameters. If a source
parameter is suspect, the associated flag is set to "TRUE"; parameters with
no obvious problems maintain the default, "FALSE", value.
ROSWFC2RE Catalog
The ROSWFC2RE database is the ROSAT Wide Field Camera 2RE Source
Catalogue. It contains 479 EUV sources found during the ROSAT all-sky
survey of July 1990 to January 1991. The information in this database is
based on what will be published by Pye et al. (1995, MNRAS, in press). It
supersedes the earlier Bright Source Catalogue (BSC; Pounds et al. 1993,
MNRAS, 260, 77).
ROXA Catalog
Although blazars are a small fraction of the overall AGN
population, they are expected to be the dominant population of extragalactic
sources in the hard X-ray and gamma-ray bands and have been shown to
be the largest contaminant of CMB fluctuation maps. So far the number
of known blazars is of the order of several hundreds, but the
forthcoming AGILE, GLAST and Planck space observatories will detect
several thousand of objects of this type. In preparation for these
missions it is necessary to identify new samples of blazars to study
their multi-frequency characteristics and statistical properties. The authors
have compiled a sample of objects with blazar-like properties via a
cross-correlation between large radio (NVSS, ATCAPMN) and X-ray
surveys (RASS) using the SDSS-DR4 and 2dF survey data to
spectroscopically identify their candidates and test the validity of the
selection method. They present the Radio-Optical-X-ray catalog built
at ASDC (ROXA), a list of 816 objects among which 510 are confirmed
blazars. Only 19% of the candidates turned out to be certainly
non-blazars, demonstrating the high efficiency of our selection method.
This catalog includes 173 new blazar identifications, or about 10% of
all presently known blazars. The relatively high flux threshold in the
X-ray energy band (given by the RASS survey) preferentially selects
objects with high F_X/F_r ratio, leading to the discovery of new High
Energy Peaked BL Lac (HBLs). This catalog therefore includes many new
potential targets for GeV-TeV observations.
The selection method consisted of three steps: 1) a first cross-correlation
between radio and X-ray surveys (the NRAO VLA Sky Survey, ATCAPMN
(ATCA catalogue of compact PMN sources) and ROSAT All Sky Survey; 2)
for each radio/X-ray match, optical magnitudes were retrieved from the
Guide Star Catalog; 3) for all radio/optical/X-ray matches the authors
calculated the X-ray to optical (alpha_ox) and radio to optical
(alpha_ro) spectral slopes and took only sources with alpha_ox and
alpha_ro values within the blazar area. For each object, redshift, B
and G magnitudes, radio fluxes at 1.4 GHz and at 5 GHz, X-ray flux,
F_X/F_r ratio, X-ray luminosity, radio luminosity, Ca H&K break and
classification are given.
SACY Catalog
The SACY (Search for Associations Containing Young Stars) Catalog
contains the results from a high-resolution optical spectroscopic survey
aimed to search for nearby young associations and young stars among
optical counterparts of ROSAT All-Sky Survey X-ray sources in the Southern
Hemisphere. 1953 late-type (B-V>=0.6), potentially young, optical counterparts
were selected out of a total of 9574 1RXS sources for follow-up observations.
At least one high-resolution spectrum was obtained for each of 1511 targets.
This paper is the first in a series presenting the results of the SACY
survey in which the sample of X-ray selected stars and the supporting
optical observations are described.
The SACY sample is defined by Hipparcos (CDS Cat. <I/239>) and Tycho-2
(CDS Cat. <I/259>) stars within an error radius of 2.6 times the positional
error of the ROSAT All-Sky Bright Source Catalogue (1RXS, CDS Cat. <IX/10>).
The used cut-off (B-V=0.6), corresponding approximately to a G0
dwarf, is near the hottest stars where the strength of the LiI line
can be used as an youth indicator. All Hipparcos stars having M_v < 2.0
have been excluded. The northern boundary limits of the survey are given in
Table 1 of the reference paper. In addition to the 1511 stars observed at
least once, 115 stars with data taken from the literature have been added
in order to complement the sample. In addition to these 1626 stars in the
SACY sample (sources with source number prefixes of 'S'), entries for 165
other observed stars (sources with source number prefixes of 'O') are also
included in this table.
Most of the spectroscopic observations (~70%) were performed with the
FEROS spectrograph at the 1.5m/ESO telescope at La Silla between
January 1999 and September 2002 (ON-ESO agreement and ESO program
identification 67.C-0123). Two more runs (ESO program identifications
072.C-0393 and 077.C-0138) were carried out at the 2.2m/ESO telescope.
Another set of data (~30%) was collected at the coude spectrograph
attached to 1.60m telescope at the Observatorio rio do Pico dos Dias
(OPD), LNA, Brazil. Some spectra are a re-analysis of the ones taken
for the PDS program. A few observations were collected using the
CORALIE attached to the Swiss Euler Telescope at La Silla.
UBV(RI)c photometry for part of the sample was obtained using FOTRAP
at the 0.60m Zeiss telescope of the OPD. When a star was not observed
photometrically by the authors, they tried to obtain some useful photometric
data from the Hipparcos and Tycho Catalogues or in the available literature
in the SIMBAD. For multiple stars, magnitudes and colors were
corrected in order to take into account the presence of the companion(s).
SDSSWHLGC Catalog
Clusters of galaxies in most of the previous catalogs have
redshifts z <= 0.3. Using the photometric redshifts of galaxies from the
Sloan Digital Sky Survey Data Release 6 (SDSS DR6), the authors identify
39,716 clusters in the redshift range 0.05 < z < 0.6 with more than eight
luminous (M_r <= -21) member galaxies. Cluster redshifts are estimated
accurately with an uncertainty of less than 0.022. The contamination rate
of member galaxies is found to be roughly 20%, and the completeness of
member galaxy detection reaches ~90%. Monte Carlo simulations show that the
cluster detection rate is more than 90% for massive (M_200 > 2 x 10^14
M_sun, where M_200 is the total mass within the radius in which the mean
mass density is 200 times the critical cosmic mass density) clusters of
z <= 0.42. The false detection rate is ~5%. The authors
obtain the richness, the summed luminosity, and the gross galaxy number
within the determined radius for identified clusters. They are tightly
related to the X-ray luminosity and temperature of the clusters. Cluster
mass is related to the richness and summed luminosity with M_200 ~
R^(1.90+/-0.04)^ and M_200 ~ L_r^(1.64+/-0.03)^, respectively. In addition,
790 new candidate X-ray clusters are found by cross-identification of
these clusters with the source list of the ROSAT X-ray All-Sky Survey.
SMCROSXRAY Catalog
This catalog presents the results of a systematic search for
point-like and moderately extended soft (0.1-2.4 keV) X-ray sources in a
raster of nine pointings covering a field of 8.95 square degrees which was
performed with the ROSAT PSPC between October 1991 and October 1993 in the
direction of the Small Magellanic Cloud (SMC). 248 objects were detected and
are included in this first version of the SMC catalog of soft X-ray sources.
The authors set up seven source classes defined by selections in the count
rate, hardness ratio and source extent parameters. They found five high
luminosity super-soft sources (1E 0035.4-7230, 1E 0056.8-7146,
RX J0048.4-7332, RX J0058.6-7146 and RX J0103-7254), one
low-luminosity super-soft source RX J0059.6-7138 correlating with the
planetary nebula L357, 51 candidate hard X-ray binaries including
eight bright hard X-ray binary candidates, 19 supernova remnants
(SNRs), 19 candidate foreground stars and 53 candidate background
active galactic nuclei (and quasars). Likely classifications are given
for about 60% of the catalogued sources. The total count rate of the
detected point-like and moderately extended sources in the catalog
is 6.9 +/- 0.3 counts s-1, comparable to the background subtracted total rate
from the integrated field of about 6.1 +/- 0.1 counts s-1.
SMCROSXRY2 Catalog
This is a catalogue of 517 discrete X-ray sources in a
6 degree by 6 degree field covering the Small Magellanic Cloud (SMC). The
catalogue was derived from the pointed ROSAT PSPC observations
performed between October 1991 and May 1994 and is complementary to
the Large Magellanic Cloud (LMC) catalogue published by Haberl &
Pietsch (1999, A&AS, 139, 277). The authors followed the same
identification scheme and used, among other information, X-ray
hardness ratios and spatial extent to classify unknown sources as
candidates for active galactic nuclei (AGN), foreground stars,
supernova remnants (SNRs), supersoft sources (SSSs) and X-ray
binaries. In Table 7 of the paper from which this catalog is taken (Haberl
et al. 2000, A&AS, 142, 41), for 158 of these 517 sources a likely source
type is given, from which 46 sources are suggested as background AGN
(including candidates resulting from a comparison of X-ray and radio
images). Nearly all of the X-ray binaries known in the SMC were detected
in the ROSAT PSPC observations; most of them with luminosities below
1036 erg/s, suggesting that the fraction of high-luminosity X-ray binary
systems in the Magellanic Clouds (MCs) is not significantly larger than
in our galaxy.
SPIDERSROS Catalog
This catalog aims to provide a detailed description of the SPectroscopic
IDentification of ERosita Sources (SPIDERS) survey, an SDSS-IV program aimed
at obtaining spectroscopic classification and redshift measurements for
complete samples of sufficiently bright X-ray sources.
The authors describe the SPIDERS X-Ray Point Source Spectroscopic Catalog,
considering its store of 11,092 observed spectra drawn from a parent sample
of 14,759 ROSAT and XMM sources over an area of 5,129 deg2 covered in
SDSS-IV by the eBOSS survey.
This catalog presents the SPIDERS ROSAT subsample of 21,288 sources which were
drawn from the Second ROSAT All-Sky Survey (2RXS), provided by the HEASARC in
RASS2RXS. The accompanying
SPIDERSXMM table contains the 3,196 sources
drawn from the XMM Slew Survey Source Catalog, version 2 (XMMSL2), provided
by the HEASARC in XMMSLEWFUL.
This program represents the largest systematic spectroscopic observation of
an X-ray selected sample. A total of 10,970 (98.9%) of the observed objects
are classified and 10,849 (97.8%) have secure redshifts. The majority of the
spectra (10,070 objects) are active galactic nuclei (AGN), 522 are cluster
galaxies, and 294 are stars.
The SDSS-IV/BOSS spectrographic observations are taken between 2014 and 2019.
W2RAGNCAT Catalog
The authors of this catalog have developed the SIX statistic to identify
bright, highly likely active galactic nucleus (AGN) candidates solely on the
basis of Wide-field Infrared Survey Explorer (WISE), Two-Micron All-Sky
Survey (2MASS), and ROSAT All-Sky Survey (RASS) data. This statistic was
optimized with data from the preliminary WISE survey and the Sloan Digital
Sky Survey, and tested with Lick 3 m Kast spectroscopy. The authors find that
sources with SIX < 0 have a >~ 95% likelihood of being an AGN (defined in
this paper as a Seyfert 1, quasar, or blazar). This statistic was then
applied to the full WISE/2MASS/RASS dataset, including the final WISE data
release, to yield the "W2R" sample of 4316 sources with SIX < 0. Only 2209
of these sources are currently in the Veron-Cetty and Veron (VCV) Catalog of
spectroscopically confirmed AGNs, indicating that the W2R sample contains
nearly 2000 new, relatively bright (J <~ 16) AGNs. The authors utilize the
W2R sample to quantify biases and incompleteness in the VCV Catalog. They
find that it is highly complete for bright (J < 14), northern AGNs, but the
completeness drops below 50% for fainter, southern samples and for sources
near the Galactic plane. This approach also led to the spectroscopic
identification of 10 new AGNs in the Kepler field, more than doubling the
number of AGNs being monitored by Kepler. The W2R sample contains better than
1 bright AGN every 10 deg2, permitting construction of AGN samples in any
sufficiently large region of sky. This table contains the 4316 sources
comprising the W2R sample.
WARPS Catalog
The Wide Angle ROSAT Pointed Survey, First Phase (WARPS-I) table is a catalog
which contains optical identifications for objects found in a serendipitous
survey of relatively deep, pointed ROSAT observations for clusters of
galaxies. The X-ray source detection algorithm used by WARPS is Voronoi
Tessellation and Percolation (VTP), a technique which is equally sensitive to
point sources and to extended sources of low surface brightness. WARPS-I is
based on the central regions of 86 ROSAT PSPC fields, covering an area of
16.2 square degrees. The X-ray source screening and optical identification
process for WARPS-I yielded 34 clusters at 0.06<z<0.75. Twenty-two of these
clusters form a complete, statistically well-defined sample drawn from 75 of
these 86 fields, covering an area of 14.1 square degrees, with a flux limit
of F(0.5-2.0keV) = 6.5x10-14 erg/cm2/s. This sample can be used to study
the properties and evolution of the gas, galaxy and dark matter content of
clusters and to constrain cosmological parameters.
WARPS2 Catalog
This table contains the galaxy cluster catalog from the second, larger phase
of the Wide Angle ROSAT Pointed Survey (WARPS), an X-ray selected survey for
high-redshift galaxy clusters. WARPS is among the largest deep X-ray cluster
surveys and is being used to study the properties and evolution of galaxy
clusters. The WARPS-II sample contains 125 clusters serendipitously detected
in a survey of 301 ROSAT PSPC pointed observations and covers a sky area of
56.7 deg2. Of these 125 clusters, 53 have not been previously reported in
the literature. The authors have nearly complete spectroscopic follow-up of
the clusters, which range in redshift from z = 0.029 to z = 0.92 with a
median redshift of z = 0.29 and they find 59 clusters with z >= 0.3 (29 not
previously reported in the literature) and 11 clusters with z >= 0.6 (6 not
previously reported). They also define a statistically complete subsample of
102 clusters above a uniform flux limit of 6.5 x 10-14 ergs/cm2/s (0.5 -
2.0 keV). In their paper, the authors also compare their redshifts, fluxes,
and detection methods to other similar published cluster surveys and state
that they find no serious issues with their measurements or completeness.
The list of ROSAT pointings used in WARPS-II is given in Table 1 of the
first reference paper. The WARPS-I cluster catalog (the second reference
listed below) is also available in Browse as the WARPS table.
WFCPOINT Catalog
The WFCPOINT database table contains the list of ROSAT-Wide Field Camera
calibration (CAL), performance verification (PV), and AO phase observations.
For each observation listed in WFCPOINT, the target name, celestial
co-ordinates, sequence number, PI name, and proposal title are given. The
date of the observation, date that the data were distributed, and the date
that the data will be released to the public are also given. The public
release date is nominally 1 year and 14 days after the distribution date;
however, because of some processing problems with a few datasets, the actual
release date will be delayed from the given date.
WGACAT Catalog
WGACAT is a point source catalog generated from all ROSAT PSPC pointed
observations. This catalog has been generated by N.E. White (HEASARC/GSFC),
P. Giommi (SDC/ASI) and L. Angelini (HEASARC/GSFC) and is a private research
effort, not related to the official catalogs generated by the ROSAT project.
The WGACAT was made first publicly available in November 1994 through the
HEASARC on-line service (White, Giommi and Angelini 1994), with a first
minor revision in March 1995 (WGACAT95 hereafter). It was generated using
all the public ROSAT PSPC pointed data available than, corresponding to
75 % of the entire set, and featured ~ 68000 detections of which 62000
were unique sources.
The current version, released in May 2000 (see also the update section),
is the final and complete version of WGACAT and includes the remaining
sequences not processed in the WGACAT95. WGACAT (May 2000) contains
about 88,000 detections, with more than 84,000 individual sources,
obtained from 4160 sequences.
The catalog was generated using an optimized sliding cell detect algorithm in
XIMAGE (first developed for the EXOSAT project). The inner and outer parts of
the images were run separately, to maximize the sensitivity to source
detection. This method is very sensitive in finding point sources, but can
also find spurious sources where there is extended emission. We have visually
inspected each detection, removed the obvious spurious cases and
assigned a quality flag to each detection.
