Stochastic model of ring structures in galaxies

Details Stochastic model of ring structures in galaxies Stochastic model of ring structures in galaxies

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990azh....67..897r&link_type=abstract

Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 67, Sept.-Oct. 1990, p. 897-907. In Russian.

Astronomy and Astrophysics

Astronomy

Galactic Structure, Gravitational Effects, Molecular Clouds, Ring Structures, Astronomical Models, Density Distribution, Inhomogeneity, Radial Velocity, Stochastic Processes

Scientific paper

The collective dynamics of an ensemble of density inhomogeneities in a rotating gravitating disk is examined, assuming that the inhomogeneities participate in the rotation of the disk and have small radial velocities. It is found that, if the contrasts of the inhomogeneities are positive, the isotropic geodesics are exponentially unstable. In this case, the collective gravitational field of the inhomogeneities is stochastic. It is shown that, with the passage of time, the inhomogeneities form a fragmented ring with nearly constant density contrast and position on the disk.

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