The kinematics of dense clusters of galaxies. II - The distribution of velocity dispersions

Details The kinematics of dense clusters of galaxies. II - The distribution of velocity dispersions The kinematics of dense clusters of galaxies. II - The distribution of velocity dispersions

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aj....106.1301z&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 106, no. 4, p. 1301-1313.

Astronomy and Astrophysics

Astronomy

64

Galactic Clusters, Red Shift, Star Distribution, Velocity Distribution, Astronomical Catalogs, Galactic Rotation, Sky Surveys (Astronomy), X Ray Sources

Scientific paper

From the survey of 31 Abell R above 1 cluster fields within z of 0.02-0.05, we extract 25 dense clusters with velocity dispersions omicron above 300 km/s and with number densities exceeding the mean for the Great Wall of galaxies by one deviation. From the CfA Redshift Survey (in preparation), we obtain an approximately volume-limited catalog of 31 groups with velocity dispersions above 100 km/s and with the same number density limit. We combine these well-defined samples to obtain the distribution of cluster velocity dispersions. The group sample enables us to correct for incompleteness in the Abell catalog at low velocity dispersions. The clusters from the Abell cluster fields populate the high dispersion tail. For systems with velocity dispersions above 700 km/s, approximately the median for R = 1 clusters, the group and cluster abundances are consistent. The combined distribution is consistent with cluster X-ray temperature functions.

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