AAS 202nd Meeting, May 2003
Session 19 Galaxy Clusters and Intergalactic Medium
Oral, Monday, May 26, 2003, 2:00-3:30pm, 209/210

## [19.02] Forces of Low-Mass Destruction: The Harsh Cluster Environment

W. Barkhouse (Harvard-Smithsonian CfA)

The results of an ongoing survey of low-redshift galaxy clusters (z\leq 0.2) indicate that there is a deficiency of dwarf galaxies in the central cluster region. Examination of the luminosity function, dwarf-to-giant ratio, and the (Blue/Red) fraction (all as a function of cluster-centric radius --- normalized with respect to the virial radius), supports this conclusion. These results, along with the comparison of the color gradient of the dwarf galaxy population with the color gradient of the Brightest Cluster Galaxy (BCG) envelope, are consistent with the hypothesis that the tidal disruption of dwarf galaxies has contributed to the formation of the BCG halo.