Flattening of galaxies of different morphological types in subclusters of Coma |
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| Authors: | N G Kogoshvili T M Borchkhadze A T Kalloghlian |
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| Institution: | (1) E. K. Kharadze Abastumani National Astrophysical Observatory, Georgia;(2) V. A. Ambartsumyan Byurakan Astrophysical Observatory, Armenia |
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| Abstract: | This paper deals with the observed variation in the flattening of galaxies with the density of galaxies in the subclusters
of Coma surrounding NGC 4889, NGC 4874, and NGC 4839 based on data from the Abastumani Combined Catalog of Galaxies. The mean
values of the observed ratios of the diameters of the galaxies, as well as histograms of their distributions, indicate that
in the central, dense regions of the subclusters within a volume of 0.5h
75
−1
Mpc3, E and S0 type galaxies are close to spheroidal. A significant reduction in the mean values of the diameters of the galaxies
in the subclusters is noted, regardless of their morphology relative to the galaxies in the halo of the Coma cluster. In the
subclusters, spiral galaxies are found with a hydrogen deficit that is more than 5 times the hydrogen deficit in spirals within
the halo of the cluster. According to their 3-D coordinates, most of the galaxies with a hydrogen deficit are located closer
to the south-east edge of the subcluster surrounding NGC 4874 near an extended gas filament in the x-ray region. This may
indicate that the subcluster is moving toward a central condensation of faint galaxies in the Coma cluster and a possible
merger with it.
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Translated from Astrofizika, Vol. 50, No. 3, pp. 355–368 (August 2007). |
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| Keywords: | galaxies clusters subclusters |
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