Active galactic nuclei. I - Central source as a cluster of accreting black holes

Details Active galactic nuclei. I - Central source as a cluster of accreting black holes Active galactic nuclei. I - Central source as a cluster of accreting black holes

Apr 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...303...76p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 303, April 1, 1986, p. 76-86.

Astronomy and Astrophysics

Astronomy

14

Accretion Disks, Active Galactic Nuclei, Astronomical Models, Black Holes (Astronomy), Quasars, Galactic Structure, Periodic Variations

Scientific paper

A generalization of an accreting supermassive black hole model for the central nuclear engine of QSOs and active galactic nuclei (AGNs) is suggested in terms of a dense cluster of many black holes and compact objects. In this scenario, the cluster possesses a mass spectrum, with each hole surrounded by an accretion disk. The fitting of the thermal radiation spectrum of such a cluster to the observed optical-X-ray power-law spectrum of QSOs and AGNs determines the total mass, number of black holes, and mass spectrum index for the cluster. Their dynamics are also discussed, and the consumption and evaporation rates of member holes are estimated under the approximation of many stellar-size holes in the field of a single large central black hole. Finally, the variability of a QSO or AGN modeled in terms of a cluster of accreting holes is investigated, and it is shown that such a model allows the same time scales of variability as, or even shorter ones than, a model involving a single hole of the same mass. The shorter time scales are allowed when rapid variations are limited to a longer waveband, as is observed for sources in contrast with the single-hole model.

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