Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84...27s&link_type=abstract
Astronomical Journal, vol. 84, Jan. 1974, p. 27-39.
Astronomy and Astrophysics
Astronomy
35
Galactic Clusters, Velocity Distribution, Wave Dispersion, Histograms, Radial Velocity, Statistical Analysis
Scientific paper
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.
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