On the nature of quasars and active galactic nuclei

Details On the nature of quasars and active galactic nuclei On the nature of quasars and active galactic nuclei

May 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ap%26ss..48..401g&link_type=abstract

Astrophysics and Space Science, vol. 48, no. 2, May 1977, p. 401-420. In Russian.

Astronomy and Astrophysics

Astronomy

6

Active Galactic Nuclei, Astronomical Models, Cosmology, Quasars, Black Holes (Astronomy), Earth Magnetosphere, Galactic Evolution, Optical Thickness, Rotating Plasmas, Seyfert Galaxies, Star Clusters, Stellar Mass Accretion, Supernovae

Scientific paper

Some universal properties of quasars and active galactic nuclei are reviewed, and three hypotheses on the nature of the central object in active nuclei are evaluated. These include a supermassive rotating magnetoplasma body (a magnetoid), an accreting supermassive black hole, and a compact star cluster undergoing multiple supernovae. The models are examined in relation to observational data on the regular optical variability of four quasars, two N galaxies, and two Seyfert galaxies. It is concluded that: (1) the compact-star-cluster model is unlikely in the light of these data; (2) the simplest model of a black hole with a hot spot on the surface of a thin accretion disk cannot explain the observed regularity of the brightness variations; (3) a more complex model with an optically thick corona around the black hole may be compatible with the observations; (4) the magnetoid model is the least vulnerable one; and (5) a choice between the magnetoid and black-hole models must await further development of the models as well as additional observational data.

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