Taxonomical analysis of superclusters - II. The A 1367/Coma supercluster.

The nonhierarchical taxonomical method has been applied to a sample of 185 galaxies, complete to m not greater than 15, in the A1367/Coma region. Once the fore- and background galaxies have been identified, the analysis of the A1367 cluster shows it composed by two gravitationally bound clumps at essentially the same redshift, 6396 km/s and 6562 km/s, respectively. Central Coma is traced by three different groups whose gravitational binding does not appear clearly. However, accepting the unique dynamical entity of Central Coma, some other neighboring groups would be part of the cluster. In that case, the average radial velocity and dispersion of the Coma cluster would be 7013 and 423 km/s, respectively. The M/L ratios for the groups evidenced by the taxonomy range from 13 to 170. The missing mass problem only appears when all the galaxies in the sample are considered as members of a unique dynamical structure. The relationship found in other systems between the redshift, the morphological type and the radioemissivity is also present in the sample.