Should a self-gravitating system relax towards an isothermal distribution?

Details Should a self-gravitating system relax towards an isothermal distribution? Should a self-gravitating system relax towards an isothermal distribution?

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ap%26ss.112..215k&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 112, no. 2, May 1985, p. 215-223. Research supported by the University of

Statistics

Computation

5

Computational Astrophysics, Globular Clusters, Gravitation, Isothermal Processes, Star Distribution, Collisions, Maxwell-Boltzmann Density Function, Thermal Instability

Scientific paper

In light of calculations presented by Prigogine and Severne (1966, 1968), whose possible physical implications for real astrophysical systems, such as globular clusters, have not yet been given adequate attention, it is noted that a self-gravitating system of stars need not tend toward the complete relaxation of an isothermal distribution. Even the neglect of evaporation and gravithermal instability does not preclude deviations from a Maxwellian distribution of velocities manifest on a time scale t(s) of about (log N)t(r), where t(r) is the ordinary binary relaxation time and N is the number of stars.

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