Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....97..122a&link_type=abstract
Astronomy and Astrophysics, vol. 97, no. 1, Apr. 1981, p. 122-127. Research supported by the Conselho Nacional de Desenvolvimen
Astronomy and Astrophysics
Astronomy
8
Active Galaxies, Black Holes (Astronomy), Emission Spectra, Galactic Radiation, Photoionization, Quasars, Stellar Mass Accretion, Supermassive Stars, Abundance, H Beta Line, Radio Galaxies, Ultraviolet Astronomy, Ultraviolet Radiation, X Ray Sources
Scientific paper
The UV radiation emitted by the accretion disk onto a supermassive black hole is considered as the source of ionization and heating for the emission line regions of the active nuclei of galaxies and quasi-stellar objects. It is shown that the observed H-beta luminosity and the He II 4686/H-beta intensity ratio determine the accretion of rate and the black hole mass for each object. Standard photoionization models have been constructed by assuming this type of energy source. For two objects, Mrk 34, a Seyfert type 2 nucleus, and 3C 98, a narrow line radio galaxy, the photoionization models reproduce quite well the observed line intensities.
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