AAS 207th Meeting, 8-12 January 2006
Session 139 Entropy, Convection and Cluster Properties
Poster, Wednesday, 9:20am-6:30pm, January 11, 2006, Exhibit Hall

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[139.09] Breaking Self-Similarity in Poor Clusters of Galaxies

J. C. Kempner (Bowdoin College), L. P. David (Harvard-Smithsonian Center for Astrophysics)

The large scatter in the LX--TX relation among poor clusters in the ~2--4 keV range indicates that the self-similarity seen among hotter clusters does not apply to their cooler siblings. Many forms of non-gravitational heating have been proposed to break this self-similarity, including cluster mergers, AGN heating, and supernova ``pre-heating.'' We present an analysis of a sample of poor clusters from the Chandra and XMM archives that suggests a cycle of heating and cooling in the cores of these clusters is responsible for the departures from self-similarity. That these differences exist only in the core is strongly suggestive of AGN heating as the dominant mechanism. Support for this work was provided by the National Aeronautics and Space Administration through Chandra Award Number G05-5138A issued by the Chandra X-ray Observatory Center, which is operated by the Smithsonian Astrophysical Observatory for and on behalf of NASA under contract NAS8-39073, and by NASA contract NAG5-12933.

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Bulletin of the American Astronomical Society, 37 #4
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