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The nature of multiple-nucleus cluster galaxies
Merritt, D.
AA(California, University, Berkeley, CA)
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 280, May 1, 1984, p. L5-L8. (ApJL Homepage)
Publication Date:
NASA/STI Keywords:
Galactic Clusters, Galactic Evolution, Galactic Nuclei, Astronomical Models, Luminosity, Orbital Elements
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In models for the evolution of galaxy clusters which include dynamical friction with the dark binding matter, the distribution of galaxies becomes more concentrated to the cluster center with time. In a cluster like Coma, this evolution could increase by a factor of approximately 3 the probability of finding a galaxy very close to the cluster center, without decreasing the typical velocity of such a galaxy significantly below the cluster mean. Such an enhancement is roughly what is needed to explain the large number of first-ranked cluster galaxies which are observed to have extra 'nuclei'; it is also consistent with the high velocities typically measured for these 'nuclei'. Unlike the cannibalism model, this model predicts that the majority of multiple-nucleus systems are transient phenomena, and not galaxies in the process of merging.

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Database: Astronomy
arXiv e-prints