Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980ap%26ss..70..263b&link_type=abstract
Astrophysics and Space Science, vol. 70, no. 2, July 1980, p. 263-279.
Astronomy and Astrophysics
Astrophysics
4
Astronomical Models, Disk Galaxies, Galactic Evolution, Galactic Nuclei, Galactic Structure, Gas Density, Cores, Galactic Rotation, Gas Flow, Gas Viscosity, High Energy Interactions, Interstellar Magnetic Fields, Radial Flow
Scientific paper
A model for the formation of superdense gaseous cores by accretion in the nuclei of disk galaxies is presented. Equations for radial flow of gas into the nucleus in the presence of a weak galactic magnetic field were solved, and time scales for the accretion of an exploding mass in the nucleus were obtained under several situations in the absence of rotation. The time scales were in the range between a few times 10 to the 7th/yr and 10 to the 8th/yr; such time scales have been previously proposed for repeated explosions in the nuclei of galaxies. It was shown that the presence of rotational velocities in the infalling gas practically destroys the efficiency of the accretion process unless such velocities are dissipated by frictional forces within the system.
Basu Baidyanath
Bhattacharyya Tanaya
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