Velocity Dispersions in Galaxy Clusters
Abstract
We analyze the velocity dispersions of 79 galaxy clusters having at least 30 galaxies with available redshifts. We show that different estimates of velocity dispersion give similar results on cluster samples of at least ~20 galaxies each. However. only robust estimates of velocity dispersion seem to be efficient on cluster samples with ~10 galaxies each. A significant correlation is found to exist between the velocity dispersion and the cluster richness. We provide the distribution function of cluster velocity dispersions, normalized to the complete sample by Abell, Corwin. & Olowin (1989). Available theoretical models are compared with this distribution function.
 Publication:

The Astrophysical Journal
 Pub Date:
 February 1993
 DOI:
 10.1086/172256
 Bibcode:
 1993ApJ...404...38G
 Keywords:

 Galactic Clusters;
 Velocity Distribution;
 Astronomical Models;
 Computational Astrophysics;
 Correlation Coefficients;
 Distribution Functions;
 Red Shift;
 Statistical Correlation;
 Astrophysics;
 GALAXIES: CLUSTERING;
 GALAXIES: DISTANCES AND REDSHIFTS