Radial orbit instability as a mechanism of the formation of elliptical galaxies

Details Radial orbit instability as a mechanism of the formation of elliptical galaxies Radial orbit instability as a mechanism of the formation of elliptical galaxies

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992azh....69..934p&link_type=abstract

Astronomicheskij Zhurnal (ISSN 0004-6299), vol. 69, no. 5, p. 934-951.

Astronomy and Astrophysics

Astronomy

Elliptical Galaxies, Equilibrium Equations, Galactic Evolution, Orbit Perturbation, Distribution Functions, Galactic Structure, Radial Distribution

Scientific paper

Theoretical and observational data confirming radial orbit instability as the cause of galactic ellipticity are presented. Besides the principal, shape-forming function, this instability possibly plays the definitive role in establishing the equilibrium distribution function of stars in their finite state. The universal character of radial orbit instability is chiefly associated with the fact that strongly elongated (nearly radial) orbits naturally dominate in various collisionless collapses. The latter are in turn necessary features in present-day cosmogonic scenarios. The role of fire-hose instability in accounting for the phenomenon of maximal flattening of elliptical galaxies is also briefly considered.

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