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Kinematic evidence of satellite galaxy populations in the potential wells of first-ranked cluster galaxiesThe velocities of 38 centrally positioned galaxies (r much less than 100 kpc) were measured relative to the velocity of the first-ranked galaxy in 14 rich clusters. Analysis of the velocity distribution function of this sample and of previous data shows that the population cannot be fit by a single Gaussian. An adequate fit is obtained if 60 percent of the objects lie in a Gaussian with sigma = 250 km/s and the remainder in a population with sigma = 1400 km/s. All previous data sets are individually consistent with this conclusion. This suggests that there is a bound population of galaxies in the potential well of the central galaxy in addition to the normal population of the cluster core. This is taken as supporting evidence for the galactic cannibalism model of cD galaxy formation.
Document ID
19860058579
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Cowie, L. L. (Space Telescope Science Institute; Johns Hopkins University Baltimore, MD, United States)
Hu, E. M. (Space Telescope Science Institute Baltimore, MD, United States)
Date Acquired
August 12, 2013
Publication Date
June 15, 1986
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters to the Editor
Volume: 305
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAGW-464
Distribution Limits
Public
Copyright
Other