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Title:
The Early-Type Dwarf-to-Giant Ratio and Substructure in the Coma Cluster
Authors:
Secker, Jeff; Harris, William E.
Publication:
Astrophysical Journal v.469, p.623 (ApJ Homepage)
Publication Date:
10/1996
Origin:
APJ; NED
Astronomy Keywords:
GALAXIES: CLUSTERS: INDIVIDUAL NAME: COMA, GALAXIES: EVOLUTION, GALAXIES: FORMATION, GALAXIES: LUMINOSITY FUNCTION, MASS FUNCTION
DOI:
10.1086/177810
Bibliographic Code:
1996ApJ...469..623S

Abstract

We have obtained new CCD photometry for a sample of ~800 early-type galaxies (dwarf and giant ellipticals) in the central 700 arcmin^2^ of the Coma cluster, complete in color and in magnitude to R = 22.5 mag (M_R_ ~ -12 mag for H_0_ = 86 km s^-1^ Mpc^-1^). The composite luminosity function for all galaxies in the cluster core (excluding NGC 4874 and NGC 4889) is modeled as the sum of a Gaussian distribution for the giant galaxies and a Schechter function for the dwarf elliptical galaxies. We determine that the early-type dwarf-to-giant ratio (EDGR) for Coma is identical to that measured for the less rich Virgo cluster; i.e., the EDGR does not increase as predicted by the EDGR-richness correlation. We postulate that the presence of substructure is an important factor in determining the cluster's EDGR; that is, the EDGR for Coma is consistent with the Coma cluster being built up from the merger of multiple less- rich galaxy clusters.

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