Evolution of galaxies in clusters

Details Evolution of galaxies in clusters Evolution of galaxies in clusters

Jun 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...230..639d&link_type=abstract

Astrophysical Journal, Part 1, vol. 230, June 15, 1979, p. 639-647.

Astronomy and Astrophysics

Astrophysics

7

Galactic Clusters, Galactic Evolution, Galactic Structure, Astrodynamics, Astronomical Models, Boundary Value Problems, Dynamic Models, Fokker-Planck Equation, Halos, Star Distribution

Scientific paper

This paper investigates the dynamical evolution of galaxies in clusters arising from their mutual tidal interactions. For 'weak' interactions the resulting evolution may be described by a Fokker-Planck equation. A time integration of the resulting equation in energy space is employed. It is assumed that the initial distribution has a core-halo structure with only a small (about 10%) fraction of the core mass in the halo. The calculation is simplified by approximating the gravitational potential as that derived from a homogeneous mass distribution, whereby analytic expressions may be obtained for the orbit-averaged, diffusion coefficients. Calculations indicate that extended halos cannot be formed by this mechanism from originally compact systems.

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