Study of the Structure of the Coma Cluster Based on a Hierarchical Force Clustering Method |
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Authors: | N G Kogoshvili T M Borchkhadze A T Kalloghlian |
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Institution: | (1) E. K. Kharadze Abastumani Astrophysical Observatory, Georgia;(2) V. A. Ambartsumyan Byurakan Astrophysical Observatory, Armenia |
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Abstract: | Six subclusters in the Coma cluster have been selected on the basis of a hierarchical clustering method that takes the gravitational
interaction among galaxies into account. Of these, 3 central subclusters around the galaxies NGC 4889, NGC 4874, and NGC 4839
have been singled out. We have used the objective statistical criterion applied by Vennik and Anosova in studies of close
groups of galaxies to evaluate each member included in a subcluster with a high probability. Galaxies with a significant deficit
of hydrogen HI, including objects from the Bravo-Alfaro list, have been identified with members of the subclusters, with the
greatest number of them in the subclusters around NGC 4874 and NGC 4839. A quantitative estimate of the hydrogen deficit using
the HI index in the RCG3 catalog reveals a statistically significant excess value for those galaxies that are members of the
subclusters compared to galaxies with a hydrogen deficit in the overall Coma cluster field. A substantial number of the spiral
galaxies with a hydrogen deficit in the subclusters turned out to be radio galaxies as well.
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Translated from Astrofizika, Vol. 48, No. 4, pp. 515–528 (November 2005). |
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Keywords: | Galaxies: clusters galaxies: structure individual: Coma |
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