The Coma/A1367 supercluster and its environs

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Abstract

Redshifts for a total sample of 238 galaxies to a limiting magnitude of 15.0 are used to study the three-dimensional distribution of galaxies in the region of the sky ranging from approximately 11.5 h to 13.3 h right ascension between declinations of about 19 and 32 deg, within which lie the two rich clusters Coma and A1367. The results obtained demonstrate that the two clusters are embedded in a common supercluster of very large extent. It is found that there are three observationally distinct populations of galaxies within this supercluster, including galaxies located in the two rich cluster cores, those located in intermediate- or low-mass clusters, and a nearly homogeneously distributed population of isolated galaxies; in addition, a population of foreground galaxies located in low-mass clusters rather than being distributed in a homogeneous 'field' is also identified. The redshift of formation for the foreground groups is estimated to be no more than about 9, and the morphology of the galaxies is examined. It is suggested that every nearby very rich cluster is located in a supercluster and that all clusters of richness class greater than or equal to 2 will eventually be found to lie in superclusters.

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