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The dynamical evolution of poor clusters of galaxies: Growth and properties of the first-ranked galaxyWe report N-body simulations of the dynamical evolution of isolated clusters of 50 galaxies containing a dark matter component that comprises 90% of the cluster mass. For our adopted physical scaling, the line-of-sight velocity dispersion of the cluster is 310 km/s and the initial core radius is 250 kpc. Our results are applicable to (1) present-day poor clusters, (2) the small systems that may have merged to produce present-day rich clusters, and (3) virialized subclumps within larger systems, in between major substructure merger events. We have evolved a total of 10 cluster models, using N = 40,000 particles per model. The models are fully self-consistent in that each galaxy is represented as an extended structure containing many particles and the gravitational potential arises from the particles alone. Dark matter is apportioned between the galaxy halos and a smoothly distributed common group halo, the intracluster background (ICB). The percentage of cluster mass initially in the ICB, Beta, is chosen to be 50, 75, or 90. Increasing Beta has the effect of removing mass from dark halos around galaxies and distributing it throughout the cluster. The initial conditions were constructed by randomly sampling a King distribution with W(sub 0) = 6. The galaxies are also King models; the masses of the galaxies follow a Schechter distribution function.
Document ID
19950040848
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Bode, Paul W.
(Indiana University Bloomington, IN, United States)
Berrington, Robert C.
(Indiana University Bloomington, IN, United States)
Cohn, Haldan N.
(Indiana University Bloomington, IN, United States)
Lugger, Phyllis M.
(Indiana University Bloomington, IN, United States)
Date Acquired
August 16, 2013
Publication Date
October 1, 1994
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 433
Issue: 2
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
95A72447
Funding Number(s)
CONTRACT_GRANT: NSF AST-91-19965
CONTRACT_GRANT: NSF AST-91-0034N
CONTRACT_GRANT: NAGW-2400
Distribution Limits
Public
Copyright
Other

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