Photometric Determination of R_200 for SDSS Galaxy Clusters

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  • 20 October 2004
Abstract
We use imaging data from the Sloan Digital Sky Survey to measure the empirical size-richness relation for a large sample of galaxy clusters. Using population subtraction methods, we determine the radius at which the cluster galaxy density is 200/Omega_m times the mean galaxy density, without assuming a model for the radial distribution of galaxies in clusters. If the bias of these galaxies on Mpc scales is one, this galaxy-density R_200 reflects the characteristic radii of clusters. In this paper we examine the radial profiles of galaxy clusters and present results for R_200 and concentration c_gal as a function of cluster richness, and examine the behavior of the cluster luminosity function as a function of richness and radius.

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