Comparison of Simulated and Observed Density Profiles in Galaxy Clusters

Abstract

Introduction We have undertaken a detailed study of density profiles of compact groups of galaxies and rich clusters of galaxies. Some preliminary results will be presented here. We attack two problems in the study -- how to define a quantity connected with the density profiles of the Hickson compact groups (HCG) and how to verify the existence of the secondary maxima in density profiles of some rich clusters of galaxies. We assume H 0 = 100 km/s/Mpc. 2 Density profiles of HCG It is very difficult if possible to define any radial distribution of galaxies in groups, especially for the compact ones. Our effort leads to a proposal to use only one median characteristic r mm . Supposing M=L = const for HCG galaxies we estimate weighted group centers and define the median distance r m to the center of each group. Then a median distance r mm o