Velocity dispersions in galaxy clusters

Details Velocity dispersions in galaxy clusters Velocity dispersions in galaxy clusters

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...404...38g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 404, no. 1, p. 38-50.

Statistics

Computation

108

Galactic Clusters, Velocity Distribution, Astronomical Models, Computational Astrophysics, Correlation Coefficients, Distribution Functions, Red Shift, Statistical Correlation

Scientific paper

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.

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