AAS 207th Meeting, 8-12 January 2006
Session 112 Going Shallow, Going Deep: Clusters
Poster, Wednesday, 9:20am-6:30pm, January 11, 2006, Exhibit Hall

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[112.04] X-ray Selected Galaxy Groups at Intermediate Redshift

J. S. Mulchaey (Carnegie Observatories), L.M. Lubin (UC Davis), T.E. Jeltema (Carnegie Observatories), C. Fassnacht (UC Davis), P. Rosati (ESO)

We present results from a multiwavelength study of a sample of galaxy groups selected from the ROSAT Deep Cluster Survey. The groups span the redshift range z ~ 0.23--0.59 and have between 4 and 20 confirmed members. The velocity dispersions of these groups range from ~ 125 km/s to 650 km/s. Similar to X-ray groups at low redshift, these systems contain a significant population of early-type galaxies. In most cases, the X-ray emission is peaked on the most luminous elliptical galaxy in the group. However, there are a few prominent exceptions where the X-ray emission is not centered on any particular galaxy. These systems may be groups in the process of collapsing for the first time.

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