Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.181..735b&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 181, Dec. 1977, p. 735-746. Research supported by the Lindemann Trust a
Astronomy and Astrophysics
Astrophysics
81
Astrophysics, Friction Drag, Galactic Clusters, Kinetic Friction, Star Distribution, Energy Distribution, Galactic Evolution, Globular Clusters, Relaxation (Mechanics), Relaxation Time, Two Body Problem, Velocity Distribution
Scientific paper
This paper investigates the way the morphologies of rich clusters of galaxies will be affected by the action of dynamical friction on the brighter galaxies. It is argued that rich clusters, which are often elongated on the sky although not rotating, owe their shapes to frozen-in velocity anisotropy. A calculation shows that if the velocity distributions of these clusters are anisotropic, the anisotropy of the distributions of the brighter galaxies will be increased by the action of dynamical friction. The time scale for the operation of this effect is precisely the time scale for the action of dynamical friction in spherical clusters, which is unknown due to uncertainty about the magnitude of the (M/L) values of bright galaxies. Evidence is reviewed which indicates that the distributions of bright galaxies in several clusters are more elongated on the sky than the distributions of less bright galaxies. Application of these ideas to the formation of cD galaxies and the capture of globular clusters by galactic nuclei is discussed.
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