The kinematics of Abell clusters

• Published in: The Astrophysical journal. Supplement series Vol. 74; no. 1; pp. 1 - 36
• Main Authors: Zabludoff, Ann I., Huchra, John P., Geller, Margaret J.
• Format: Journal Article
• Language: English
• Published: Legacy CDMS University of Chicago Press 01.09.1990
• Subjects: 640105 - Astrophysics & Cosmology- Galaxies; Astronomy; Astrophysics; CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COORDINATES; COSMOLOGICAL MODELS; COSMOLOGY; DYNAMICS; Earth, ocean, space; Exact sciences and technology; GALACTIC EVOLUTION; GALAXY CLUSTERS; Galaxy groups, clusters, and superclusters. Large-scale structure of the universe; MATHEMATICAL MODELS; MECHANICS; MONTE CARLO METHOD; NONLUMINOUS MATTER; RED SHIFT; Stellar systems. Galactic and extragalactic objects and systems. The universe; VELOCITY; Galaxies cluster; Data analysis; Cosmological redshift; Galaxies clustering; Position; Kinematics; Data table; Velocity distribution; Velocity dispersion
• ISSN: 0067-0049; 1538-4365
• DOI: 10.1086/191492

Velocity histograms, galaxy positions, and velocity dispersions are presented for 69 nearby Abell clusters. The shape of the cumulative distribution for R = 1 or more clusters does not match the predictions of standard CDM models for any biasing parameter b. The only models consistent with the median and maximum dispersions of the sample are those of b about 1.6-2.0 and in which clusters are identified in three dimensions. Velocity dispersions of high-redshift systems appear fundamentally different from those of nearby clusters. The median dispersion of the subset of 25 cD clusters is similar to that of non-cD systems. A substantial fraction of the cD galaxies have velocities significantly different from the mean of their parent clusters. Three of these have 4 s or more measured redshifts. These last two results suggest that the formation of cD galaxies is dominated by the local, rather than global, cluster environment.