Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986azh....63..897l&link_type=abstract
Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 63, Sept.-Oct. 1986, p. 897-913. In Russian.
Astronomy and Astrophysics
Astronomy
7
Eclipsing Binary Stars, Galactic Nuclei, Galactic Radiation, Quasars, Radio Jets (Astronomy), Accretion Disks, Active Galactic Nuclei, Binary Stars, Black Holes (Astronomy), Seyfert Galaxies
Scientific paper
The modern observational data on the variability of galactic nuclei and quasars in all accessible spectral ranges (from radio to γ rays), as well as the data on the optical and radio jets observed in galactic nuclei and quasars are discussed. Analogy is drawn between the processes in galactic nuclei and quasars and those which have been observed in the supercritical precessing accretion disk around the probable black hole in the eclipsing binary system SS433. The recent data of various authors concerning the emission-line variability in the spectra of Seyfert galactic nuclei have confirmed the rapid variability discovered by the authors previously of the intensity of the broad permitted emission component which correlates with the variability of the optical continuum with the lag of some 2 - 4 weeks. This is the direct evidence that the excitation of the emission lines is due to radiation from central sources of active nuclei - presumably the inner parts of accretion disks. The similarity between the characteristics of the jets in galactic nuclei and quasars, on the one hand, and of the relativistic precessing jets in the SS433 object, on the other hand, suggests that in both types of objects disk accretion onto a compact object (probably a supermassive black hole in active nuclei) occurs. As a whole, the model of disk accretion of matter onto a supermassive black hole seems to be the most probable one in the case of galactic nuclei and quasars.
Cherepashchuk Anatol M.
Luytyj V. M.
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