AAS 204th Meeting, June 2004
Session 9 Clusters of Galaxies
Poster, Monday, May 31, 2004, 9:20am-6:30pm, Ballroom

## [9.02] Do Groups of Galaxies at Intermediate Redshift Contain Hot Gas?

D. S. Spiegel, F. Paerels, C. Scharf (Columbia University)

Rich clusters of galaxies can be clearly identified in X-ray images from the \textsl{Chandra} and \textsl{XMM-Newton} X-ray observatories, consistent with their containing a large fraction of their baryonic mass as hot, highly ionized, diffuse gas. Some small groups of galaxies in the local universe have also been seen to contain a hot-gas component. Preliminary results from a 50 ksec \textsl{XMM} observation of a field with 40 optically-identified galaxy-groups between redshift 0.1 and 0.6, however, indicate almost no spatial or spectral correlation between groups and X-ray emission. Several of the groups suggest interesting results and merit further study.

Bulletin of the American Astronomical Society, 36 #2
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