Galaxy Associations within the Coma Cluster

V. G. Gurzadyan; A. Mazure

doi:10.1016/s1384-1076(01)00043-4

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arXiv · astro-ph/0102136

Galaxy Associations within the Coma Cluster

V. G. Gurzadyan·A. Mazure

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Abstract

The mean redshift of the core of the Coma cluster - cz = 6953 km s^{-1} and its dispersion σ=949 km s^{-1} are obtained by means of the analysis of the substructures of this cluster by using the S-tree method. The existence of three subgroups of galaxies is revealed, one of them is associated with the cD galaxy NGC 4874, the other -- with NGC 4889. It is argued that these subgroups are {\it galaxy associations}, i.e. galactic dynamical entities moving within the main cluster. Thus we conclude that the non-stationarity of the dynamical processes ongoing in the Coma core is due to the merging of small-scale galaxy associations, rather than of two equal sized clusters. We provide the lists of the galaxies of the associations, the observational study of which can be of particular interest.

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V. G. Gurzadyan, A. Mazure. 2001-02-08. Galaxy Associations within the Coma Cluster. https://doi.org/10.1016/s1384-1076(01)00043-4

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