Why are spherical stellar systems relaxed

Details Why are spherical stellar systems relaxed Why are spherical stellar systems relaxed

Jan 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977gregr...8....3l&link_type=abstract

General Relativity and Gravitation, vol. 8, Jan. 1977, p. 3-6.

Astronomy and Astrophysics

Astrophysics

4

Astrophysics, Compact Galaxies, Galactic Clusters, Galaxies, Globular Clusters, Relaxation (Mechanics), Star Clusters, Stellar Systems, Cosmology, Gravitational Fields, Tides

Scientific paper

Spherical stellar systems, from globular star clusters to compact galaxy clusters, appear to be dynamically relaxed. In galaxies and galaxy clusters, collisional relaxation acts too slowly to produce the observed result; and a new argument suggests that the same may be true of globular star clusters. 'Violent relaxation' requires special initial conditions and seems unable to produce sufficiently extended halos. It is here proposed that dynamical relaxation may result from tidal perturbations by external systems. If this explanation is correct, it has important implications for the early history of galaxies and galaxy clusters.

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