The redshift-space neighborhoods of 36 loose groups. 2: Analysis

Details The redshift-space neighborhoods of 36 loose groups. 2: Analysis The redshift-space neighborhoods of 36 loose groups. 2: Analysis

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109.1469r&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 109, no. 4, p. 1469-1475

Astronomy and Astrophysics

Astronomy

23

Galactic Clusters, Kinematics, Red Shift, Velocity Distribution, Algorithms, Astronomical Catalogs, Stability, Stellar Models

Scientific paper

We explore the kinematics of 36 rich RGH89 groups identified from the first two complete slices of the CfA redshift survey. These groups have more than five members identified by a friends-of-friends algorithm at a number density contrast delta rho/rho greater than or equal to 80. To examine the stability of the determination of the velocity dispersion for these systems, we compare results for the original 232 members with results for a larger redshift sample, including 334 fainter members in the redshift neighborhoods. On average, we double the number of group members in each system. The observed distribution of velocity dispersions is stable. In fact, the velocity dispersion based on the original members identified in the CfA redshift survey is a reliable predictor of the value for the enlarged sample in an individual group. The velocity dispersion is thus a stable physical parameter for discrimination among systems galaxies. A larger sample of groups, particularly one selected from a distance limited catalog, should provide an interesting constraint on models for the formation of large-scale structure. We take H0 = km/s/Mpc.

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