Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ap%26ss.107..255s&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 107, no. 2, Dec. 1984, p. 255-270.
Astronomy and Astrophysics
Astrophysics
1
Accretion Disks, Disk Galaxies, Galactic Evolution, Galactic Nuclei, Interstellar Matter, Centrifugal Force, Galactic Rotation, Interstellar Gas, Interstellar Magnetic Fields, Magnetic Effects, Stellar Mass Ejection
Scientific paper
A model has been proposed to explain how the nucleus of a galaxy accumulates mass and becomes supermassive - ultimately giving way to gravitational instability leading to an explosion in the nucleus. The process may be repeated many times during the life-span of a galaxy. The mass shed by the evolved stars populating the central region of the galaxy can be attracted toward the nuclear core by gravitational pull. Since the incident gas possesses rotational velocity, the centrifugal repulsion of the gas may balance the gravitational pull of the nucleus; thus infall of mass into the nucleus will ordinarily be inhibited. But dissipative agents - such as the prevailing magnetic field and the viscosity of gas - may be sufficient to destroy the rotational velocity of the incident gas and keep the accretion process efficient. The correlation between rotational velocity of gas and its distance from the center of the galaxy has been deduced. The radial equation of motion has been solved and the time-scale during which the nucleus accumulates mass sufficient for explosion, has been estimated.
Basu Baidyanath
Bhattacharyya Tanaya
Saha Avishek
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