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The redshift-space neighborhoods of 36 loose groups. 2: AnalysisWe 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 H(sub 0) = km/s/Mpc.
Document ID
19950063698
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Ramella, Massimo
(Osservatorio Astronomico di Trieste Trieste, Italy)
Geller, Margaret J.
(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA United States)
Hurchra, John P.
(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA United States)
Thorstensen, John R.
(Dartmouth College, Hanover, NH United States)
Date Acquired
August 17, 2013
Publication Date
April 1, 1995
Publication Information
Publication: Astronomical Journal
Volume: 109
Issue: 4
ISSN: 0004-6256
Subject Category
Astrophysics
Accession Number
95A95297
Funding Number(s)
CONTRACT_GRANT: NAGW-201
Distribution Limits
Public
Copyright
Other

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