Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...381...72b&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 381, Nov. 1, 1991, p. 72-78. Research supported by MURST, CNR, and Blancefl
Astronomy and Astrophysics
Astronomy
5
Andromeda Galaxy, Black Holes (Astronomy), Galactic Nuclei, Spiral Galaxies, Angular Momentum, Galactic Evolution, Momentum Transfer
Scientific paper
The formation of a stationary black hole is constrained by the conditions M above 3 solar masses and cJ/GM-squared = a/m below 1, J and M being the total angular momentum and mass of the configuration which has collapsed to the hole. Recent observations indicate that some spiral galaxies, like M31, harbor a massive black hole in their center. In the case of M31, for example, the mass of the hole is estimated to be of the order of 1-10 million solar masses. The a/m content of a fluid model is calculated for the bulge of a spiral galaxy and search for the limiting mass and angular momentum distributions which would be compatible with the formation of a massive black hole in the center. The model is then compared with the data available for the nucleus of M31 to see how far the observed properties differ from this hypothetical initial condition.
Bradley Michael
Curir Anna
de Felice Fernando
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