First Results from the XMM/IMACS Groups Project

Details First Results from the XMM/IMACS Groups Project First Results from the XMM/IMACS Groups Project

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.7706m&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #77.06; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

We present the first results of the XI (XMM/IMACS) Groups Project, a study targeting a redshift-selected, statistically unbiased sample of galaxy groups with the goal of understanding how the properties and dynamics of group galaxies relate to global group properties. Here, we present X-ray and optical data for the first nine groups observed. We detect a diffuse intragroup medium in three of the nine groups. In two of these groups, the luminosity of the diffuse gas is among the lowest found for any X-ray group thus far. Compared to typical X-ray selected groups of similar velocity dispersion, the XI groups tend to be X-ray faint. The lack of significant X-ray emission in these groups is consistent with the idea that they are collapsing for the first time. The XMM and IMACS data have also been used to study the AGN population. We find that unlike rich clusters, optically-selected groups do not contain a large population of X-ray bright, optically-dull AGN. We suggest that the differences in the AGN populations of groups and clusters can be understood in terms of differences in the accretion rates for supermassive blackholes in these two environments.

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