The Ursa Major Supercluster of Galaxies: II. The Structure and Peculiar Velocities

Details The Ursa Major Supercluster of Galaxies: II. The Structure and Peculiar Velocities The Ursa Major Supercluster of Galaxies: II. The Structure and Peculiar Velocities

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001astl...27..345k&link_type=abstract

Astronomy Letters, vol. 27, p. 345-352 (2001)

Astronomy and Astrophysics

Astronomy

9

Galaxies, Groups And Clusters Of Galaxies

Scientific paper

Kormendy's relation (mu_e - log R_e) is used to investigate the structure of the compact Ursa Major supercluster of galaxies (11h30m +55deg, cz = 18000 km/s); this relation allows the distances of early-type galaxies to be estimated. The relative distances of 13 clusters in the supercluster and their peculiar velocities are determined with a mean statistical accuracy of 6%. In general, the supercluster obeys the Hubble relation between radial velocity and distance. However, there is reason to suggest that the supercluster consists of two subsystems with mean radial velocities of 16200 and 19700 km/s. For a velocity dispersion in the subsystems of about 1100 km/s, the fact that each of them is gravitationally bound is not ruled out.

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