Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...383...72g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 383, Dec. 10, 1991, p. 72-89.
Astronomy and Astrophysics
Astrophysics
47
Galactic Clusters, Galactic Nuclei, Red Shift, Velocity Distribution, Kinematics, Low Speed, Statistical Analysis
Scientific paper
Recent claims in the literature for the existence of a low-velocity dispersion population of galaxies in the cores of rich clusters are investigated, with emphasis on an examination of five clusters suggested to possess bound populations of galaxies associated with the D/cD. An improved statistical test, the Indicator test, developed to compare the number of galaxies with relative velocities less than a given fraction of the cluster scale to the number expected for an assumed parent velocity distribution, is presented. Strong supporting kinematic evidence is found for the existence of a bound population in only one of the five clusters investigated, Klemola 44. Marginal kinematic evidence in support of the bound population hypothesis is found for two clusters, A1991 and A2589. No strong supporting kinematic evidence is found for a bound population in two clusters, A2107 and A2593.
Beers Timothy C.
Gebhardt Karl
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