The Ursa Major supercluster of galaxies: II. The structure and peculiar velocities

Kormendy's relation (mu (e)-log R-e) is used to investigate the structure o f the compact Ursa Major supercluster of galaxies (11(h)30(m) + 55 degrees, cz = 18 000 km s(-1)); this relation allows the distances of early-type ga laxies to be estimated. The relative distances of 13 clusters in the superc luster and their peculiar velocities are determined with a mean statistical accuracy of 6%. In general, the supercluster obeys the Hubble relation bet ween radial velocity and distance. However, there is reason to suggest that the supercluster consists of two subsystems with mean radial velocities of 16 200 and 19 700 km s(-1). For a velocity dispersion in the subsystems of similar to 1100 km s(-1), the fact that each of them is gravitationally bo und is not ruled out. (C) 2001 MAIK "Nauka/Interperiodica".