NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-22 T13:43:35 PDT
Help | Comment | NED Home

For refcode 1979AJ.....84...27S:
Retrieve 137 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1979AJ.....84...27S Velocity dispersion profiles of clusters of galaxies M. F. Struble Abstract. Line-of-sight velocity dispersion profiles (sigma profiles) are presented for 13 clusters of galaxies having at least 30 radial velocities. The clusters considered include A2151, A1367, Virgo, A426, A1656, A2199, Cancer, A194, Fornax, A262, Centaurus, A2319, and Pegasus I. All the sigma profiles are fitted to simple power laws over the radial interval from 0.1 to 2.0 times the virial radius and are found to fall into four classifications. In view of the amount of mass segregation implied, the amount of central concentration observed, and the predominant galaxy morphology, it is suggested that these classifications represent a dynamical age sequence. Statistical tests are applied to two features appearing in some sigma profiles: the presence of a local minimum that coincides with the local minimum noted in surface density or surface brightness profiles and a decrease in line-of-sight velocity dispersion in the cores of certain clusters. Possible dynamical implications of these features are discussed in terms of Wielen's (1974) N-body simulations. Keywords: GALACTIC CLUSTERS, VELOCITY DISTRIBUTION, WAVE DISPERSION, HISTOGRAMS, RADIAL VELOCITY, STATISTICAL ANALYSIS
Retrieve 137 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home