Dynamical friction and evolution of the luminosity function in clusters of galaxies

Details Dynamical friction and evolution of the luminosity function in clusters of galaxies Dynamical friction and evolution of the luminosity function in clusters of galaxies

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...312..497k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 312, Jan. 15, 1987, p. 497-502.

Mathematics

12

Functions (Mathematics), Galactic Clusters, Galactic Evolution, Kinetic Friction, Mass To Light Ratios, Angular Momentum, Galactic Rotation

Scientific paper

It is suggested that observed variations in the luminosity function from one cluster to another, as well as from the inner to outer regions of the same cluster, are produced by the dynamical friction force acting on galaxies as they move through the cluster. Dynamical friction makes galaxies lose their energy, sink from outer regions to inner ones, and eventually be "swallowed" by the center. The force depends on the galaxy's energy and angular momentum as well as on its mass, thus making decay of galactic orbits non-self-similar in mass, leading to a change in the shape of luminosity function.

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