Merging of two galaxies with central black holes

Details Merging of two galaxies with central black holes Merging of two galaxies with central black holes

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991natur.354..212e&link_type=abstract

Nature (ISSN 0028-0836), vol. 354, Nov. 21, 1991, p. 212-214. Research supported by MOESC.

Statistics

Computation

120

Black Holes (Astronomy), Elliptical Galaxies, Galactic Mass, Galactic Structure, Luminous Intensity, Computational Astrophysics, Galactic Evolution, Many Body Problem

Scientific paper

Simulations are presented of the merging of identical galaxies with and without central black holes. It is found that, when black holes are included, the merged galaxy acquires an isothermal core comparable in mass to the sum of the two initial black holes. Furthermore, the ratio of the core radius to the half-mass radius is about the same as the ratio of the black hole mass to the total galaxy mass, a result also consistent with observational evidence. These results, which can be understood by means of simple analytical arguments, suggest that most elliptical galaxies contain central black holes with masses comparable to the mass of their cores.

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