Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976svphu.120..309o&link_type=abstract
Uspekhi Fizicheskikh Nauk, vol. 120, Oct. 1976, p. 309-318. In Russian.
Astronomy and Astrophysics
Astrophysics
Astronomical Models, Black Holes (Astronomy), Energy Sources, Galactic Nuclei, Quasars, Star Clusters, Active Galactic Nuclei, Astrophysics, Stellar Evolution, Supernovae
Scientific paper
Three different models for the central energy source in quasars and active galactic nuclei are considered: a compact star cluster, a 'magnetoid' (in its simplest form, a supermassive oblique rotator), and a supermassive accreting black hole. Two variants of the compact-cluster model are described, one involving stellar collisions during a late stage of nuclear evolution and the other involving supernovae during an early evolutionary stage. Energy-production mechanisms in each model are examined, and difficulties in fitting the models to the observed regularity of quasar and galactic-nucleus brightness variations are discussed. Based on observational data, it is argued that the central energy source must be a single body rather than a cluster of randomly and independently flaring stars. Possible tests are proposed for distinguishing between an uncollapsed supermassive rotator and a supermassive black hole.
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