Galaxy associations within the Coma cluster

✍ Scribed by V.G Gurzadyan; A Mazure

• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 131 KB
• Volume: 6
• Category: Article
• ISSN: 1384-1076
• DOI: 10.1016/s1384-1076(01)00043-4

✦ Synopsis

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The mean redshift of the core of the Coma cluster -cz 5 6953 km s and its dispersion s 5 949 km s 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 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.