Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pazh....9..707d&link_type=abstract
(Pis'ma v Astronomicheskii Zhurnal, vol. 9, Nov.-Dec. 1983, p. 707-711) Soviet Astronomy Letters (ISSN 0360-0327), vol. 9, Nov.-
Astronomy and Astrophysics
Astronomy
Astronomical Spectroscopy, Eddington Approximation, Galactic Nuclei, Line Spectra, Luminosity, Seyfert Galaxies, Doppler Effect, Emission Spectra, H Beta Line, Radial Velocity, Spectral Line Width, X Ray Sources
Scientific paper
Characteristic parameters of the spectra of the two types of Seyfert galaxies are explored. Attention is given to Doppler half-widths of the H-beta emission line, the forbidden O III/H-beta intensity ratio and the ratio of X-ray and optical luminosities. The study covered 25 type 2 and 60 type 1 Seyfert objects. The parameters are demonstrated to be distinctly different for the two kinds of galaxies, underscoring that transitions from one type to the other must be abrupt. Broad emission lines appear when a critical threshold velocity is reached. It is suggested that the entire range of morphological characteristics which identify galaxies with active nuclei could be replaced by a single benchmark: the luminosity/Eddington luminosity ratio.
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