Do Small Groups of Galaxies Contain Hot Gas?

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

Rich Clusters of galaxies can be clearly identified in X-ray images from \textsl{Chandra} and \textsl{XMM-Newton}, consistent with their containing a large fraction of their baryonic mass as hot, highly ionized, diffuse gas. Some small groups of gaalxies 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 23 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. This is in startling contrast to the observed properties of nearby groups, and raises important questions about structure evolution.

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