Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...104..218r&link_type=abstract
Astronomy and Astrophysics, vol. 104, no. 2, Dec. 1981, p. 218-228.
Astronomy and Astrophysics
Astronomy
101
Active Galactic Nuclei, Black Holes (Astronomy), Coalescing, Galactic Evolution, Active Galaxies, Astronomical Models, Beams (Radiation), Galactic Clusters, Galactic Structure, Luminous Intensity
Scientific paper
Using a merging rate consistent with observational data and cosmological simulations, the fraction of galaxies active at a given level of total luminosity is estimated. The agreement between the model prediction and the observed luminosity functions of active galactic nuclei is considered promising. The cosmological evolution of active galaxies is briefly discussed in the context of the merger model. It is pointed out that if both merging galaxies contain a central black hole, a binary black hole system will be formed at the center of the combined galaxy. Numerical three-body experiments are performed to investigate the evolution of the binary caused by three-body interactions with galactic stars. It is concluded that the minimum separation distance that the binary may reach by way of interactions with these stars is probably sufficiently small so that gravitational damping can take over and ensure merging of the holes within a Hubble time.
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