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2011MNRAS.412.2063C - Mon. Not. R. Astron. Soc., 412, 2063-2070 (2011/April-2)
Mid-infrared colour gradients and the colour–magnitude relation in Virgo early-type galaxies.
CLEMENS M.S., PANUZZO P., RAMPAZZO R., VEGA O. and BRESSAN A.
Abstract (from CDS):
We none the less find that the 16-µm emission is more centrally peaked than the near-infrared emission, implying a radial stellar population gradient. By comparing with independent evidence from studies at optical wavelengths, we conclude that a metallicity that falls with increasing radius is the principal driver of the observed gradient.
We also plot the mid-infrared colour-magnitude diagram and combine with similar work on the Coma cluster to define the colour-magnitude relation for absolute K-band magnitudes from -26 to -19. Because a correlation between mass and age would produce a relation with a gradient in the opposite sense to that observed, we conclude that the relation reflects the fact that passive ETGs of lower mass also have a lower average metallicity. The colour-magnitude relation is thus driven by metallicity effects.
In contrast to what is found in Coma, we do not find any objects with anomalously bright 16-µm emission relative to the colour-magnitude relation. Although there is little overlap in the mass ranges probed in the two clusters, this may suggest that observable `rejuvenation' episodes are limited to intermediate-mass objects.
Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): galaxies: clusters: general - galaxies: elliptical and lenticular cD - galaxies: evolution - galaxies: photometry - infrared: galaxies
Simbad objects: 35
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