NOAO >   Observing Info >   Approved Programs >   2001B-0398

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Proposal Information for 2001B-0398


PI: Wayne A. Barkhouse, University of Toronto, barkhous@astro.utoronto.ca
Address: 60 St. George Street, Toronto, Ontario M5S 3H8, Canada

CoI: Howard K.C. Yee, University of Toronto

Title: Brightest Cluster Galaxy Formation in Low-Redshift Galaxy Clusters

Abstract: We have recently completed a comprehensive photometric survey of low- redshift Abell clusters that showed that the faint end of the luminosity function (LF) is strongly correlated with cluster environment. In particular, the data indicate significantly smaller dwarf-to-giant ratios in rich clusters dominated by a cD-like diffuse central brightest cluster galaxy (BCG). Hence, we have suggested that disrupted dwarf galaxies (dGs) are responsible for the origin of the BCGs extended stellar halo and, in part, for the intracluster gas (Lopez-Cruz et al. 1997). We have recently acquired R band data for a sample of 27 Abell clusters, eleven of which were also observed in B using the KPNO 0.9- meter + MOSA with engineering grade CCDs. We propose to observe 10 Abell clusters in B with the KPNO 0.9-meter + MOSA to further investigate this dwarf galaxy disruption model. The large field of view of the MOSA will us to definitively test the disruption scenario by accurately estimating the LFs by galaxy type as a function of cluster- centric radius to a depth of M_R=-14 (H_o=50 km/s/Mpc) for a sample of low-redshift (0.02<=z<=0.04) galaxy clusters, and further investigate the relationship between the possible gradient in the colors of dwarf galaxies as a function of cluster-centric radius and the properties of the BCGs.


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