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Description Catalog Data Default Radius (arcmin) Mission Table Type
XMM-Newton Accepted Targets xmmaoY
15
 XMM-NEWTON Proposal

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 Parameter (Unit) Min Value Max Value Value Type
pno 10 94487 integer
name 0048-097 zeta Tau string
ra 00 00 00.00 23 59 55.70 position
dec -88 07 16.0 +89 15 51.0 position
proposal_type AO-1 JP string
priority A T string
exposure (s) 0 483000 integer
pi_lname ACERO ZYUZIN string
pi_fname A ZHU string
target_id 01389501 09448701 string
lii (degree) 0.00228 359.99998 float
bii (degree) -89.01808 89.58349 float
num_pointings 0 82 integer
obs_type C tS string
      abstract "Reflection-dominated" Seyfert 2 galaxies are usually interpreted in terms of an active nucleus covered by a Compton-thick absorber. However, recently discovered transitions between reflection- and transmission-dominated (Compton-thin) states are more convincingly explained as changes in the activity level of the Active Galactic Nucleus (AGN). In order to quantitatively address this issue, we propose to complete the observations of an optically defined, complete and unbiased sample of "Compton-thick" Seyfert 2 galaxies, to measure on a sound statistical basis the rate of reflection- to transmission-dominated state transitions. This requires the observation of still 3 objects - "priority C" targets for the AO2 - for a total allocation time of 60 ks. tau Boo is the first star other than the Sun which has been observed to have a global magnetic field with switching polarity. In contrast to the Sun, tau Boo's magnetic cycle has a duration of only two years. In the previous AO, we were awarded four EPIC pointings of 8 ks each to monitor tau Boo's activity in X-rays, backing up our observations with optical measurements of the chromospheric activity as well as Zeeman Doppler Imaging. We propose to continue monitoring the star during this AO with XMM-Newton for a total of 32 ks as well as with Chandra for a total of 10 ks to gain more insight into the stellar activity cycle by comparing X-ray luminosities and coronal temperatures derived from the CCD spectra to the chromospheric activity profile and the magnetic field configuration of tau Boo. string
title 1 MHZ VARIABILITY IN NOVA-LIKE V794 AQL [NE V]-SELECTED HEAVILY OBSCURED QSOS AT THE EPOCH OF THE X-RAY BACKGROUND string

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