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Title:
Galaxy clusters with multiple components. I - The dynamics of Abell 98
Authors:
Beers, T. C.; Geller, M. J.; Huchra, J. P.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AB(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA)
Publication:
Astrophysical Journal, Part 1, vol. 257, June 1, 1982, p. 23-32. (ApJ Homepage)
Publication Date:
06/1982
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Dynamic Models, Galactic Clusters, Galactic Evolution, Red Shift, Velocity Distribution, Astronomical Models, Astronomical Spectroscopy, Cosmology, Line Of Sight, Star Distribution, Two Body Problem, Virial Theorem, X Ray Sources
DOI:
10.1086/159958
Bibliographic Code:
1982ApJ...257...23B

Abstract

The nature and evolution of rich galaxy clusters containing multiple condensations is studied. Velocities for 13 members of A98 are presented and the determination of dynamical properties of the individual subclusters is substantially improved. The application of techniques for quantifying gravitational scale lengths are stressed without invocation of the symmetry arguments demanded by the usual parameter fitting procedures. The entire A98 cluster is modeled as a two-body system. The probability that A98 is bound is found to be 98 percent. From this model and the results of previous N-body simulations, it is shown that the most likely description of the system is that it reached maximum expansion about 3.5 billion years ago and is presently in a state of collapse. The subclusters will merge in another three billion years.

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