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Date and Time of the Query: 2019-06-25 T17:43:33 PDT
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For refcode 1988A&A...199...67M:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1988A&A...199...67M Subclustering and evolution of the Coma cluster Y. Mellier, G. Mathez, A. Muzure, B. Chauvineau, and D. Proust Observatoire de Toulouse, 14 Avenue E. Belin, F-31400 Toulouse, France Laboratoire d'Astrophysique, CNRS et Universite Paris 7, Observatoire de Meudon, F-92195 Meudon Principal Cedex, France Received August 6, accepted November 20,1987 Summary. In this paper we investigate how the dynamical youth, indicated by the substructure recently established in the centre of the Coma cluster, may be compatible with the advanced evolution stage suggested by the observed luminosity segregation. It is verified that the latter does not result from a spurious effect such as field contamination. From high resolution contour density map of a sample of 1630 presumed Coma members, we show that this cluster exhibits 9 density peaks. We study the correlation between the positions of bright galaxies and of these density peaks, as well as Monte-Carlo simulations to establish the significance level of these subsystems. A composite sample is then constructed, consisting of velocities with respect to the brightest galaxy in each subsystem. The histogram is not consistent with the predictions based on a single Gaussian. Two Gaussians are needed of respective widths 300 and 1400 km s^-1^. The composite sample shows a strong dependence on magnitude of the velocity dispersion. All these results are interpreted in terms of mass segregation instability inside the subclusters, the cluster as a whole being likely by far younger than its subsystems. Key words: Clusters of galaxies - galaxies: redshifts
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