A new variant of gravitational theory for the spiral structure of galaxies

Details A new variant of gravitational theory for the spiral structure of galaxies A new variant of gravitational theory for the spiral structure of galaxies

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pazh...15..890p&link_type=abstract

Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 15, Oct. 1989, p. 890-896. In Russian. In Russian.

Statistics

Computation

7

Computational Astrophysics, Gravitation Theory, Spiral Galaxies, Galactic Rotation, Galactic Structure, Stellar Orbits, Stellar Systems

Scientific paper

A classification of galaxies with a regular spiral structure (grand design) based on the properties of their central regions, where a bar (barotropic mode) may develop, is considered. Along with the usual mechanism of bar mode excitation, associated with rapid rotation, another possibility for bar formation occurs when a large enough percentage of the stars have radially elongated orbits. Roughly speaking, the two mechanisms are complementary: a new bar mode is excited in disks rotating on the average slower than disks with the usual bar instability. Characteristics for classification of spiral galaxy disks should include mean rotational velocity (in units of circular velocity) and a parameter defining the predominant orbit type in the central region.

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