S-tree Analysis of the Substructure of the Coma Cluster
Abstract
Description
The S-tree method is used to estimate the redshift of the core of Coma cluster - $cz = 6953$ km s$^{-1}$ and dispersion $σ=949$ km s$^{-1}$. The existence of three subgroups of galaxies is revealed, one of them is associated with the cD galaxy NGC 4874, another - with NGC 4889. It is argued that these subgroups are 'galaxy associations', i.e. galactic dynamical entities moving through the main cluster. The non-stationarity of the dynamical processes ongoing in the Coma core is concluded.
to appear in the proceedings of Coma Cluster meeting (Marseille, June, 1997)
to appear in the proceedings of Coma Cluster meeting (Marseille, June, 1997)