Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...291...45t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 291, April 1, 1985, p. 45-51.
Astronomy and Astrophysics
Astrophysics
38
Celestial Mechanics, Galactic Clusters, Galactic Evolution, Galactic Nuclei, Galactic Structure, Orbital Mechanics, Astronomical Models, Brightness, Circular Orbits, Density Distribution, Eccentric Orbits, Orbital Velocity
Scientific paper
Multiple nuclei in brightest cluster galaxies have two traits that are difficult to understand: (1) they are often moving very rapidly with respect to the central galaxy, and (2) their frequency suggests an immense rate of cannibalism if they are bound in circular orbits. The properties and evolution of orbits in a model rich cluster of galaxies are examined in order to determine the implications and consequences of these traits. Both of these observations can be explained if more than 50 percent of multiple nuclei are on eccentric orbits within the core of the cluster, rising a few hundred kpc from the center (20 percent would then be random projections, and fewer than 30 percent are circular orbits). A consequence of this is that the density distribution of galaxies in a cluster will have a cusp in the center, and the dispersion of the velocities of galaxies near the center of a cluster may fall with radius.
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