Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.212..553s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 212, Feb. 1, 1985, p. 553-564.
Astronomy and Astrophysics
Astronomy
15
Active Galactic Nuclei, Cosmic Plasma, Gamma Ray Astronomy, Radiation Sources, Accretion Disks, Bremsstrahlung, Quasars, Stellar Mass Accretion, X Ray Sources
Scientific paper
Recent studies by Lightman (1982), Svensson (1984), an others on the pair-equilibrium states of mildly relativistic thermal plasma, including magnetic fields and optical sources are considered. Resulting constraints on luminosities and proton densities together with observational data permit the selection of an accretion scenario in which a high-energy spectrum, similar to that of NGC 4151, is produced. It is shown that soft gamma-ray production via thermal bremsstrahlung can occur in the central region of the two-temperature, geometrically thick part of the disc. On the other hand, the power-law X-ray spectrum is expected to be generated in the intermediate region due to Comptonization of optical photons coming from an outer, geometrically thin part of the disc. Implications for the relation between quasars and Seyfert galaxies are discussed.
Sikora Marcin
Zbyszewska Magda
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