Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.197..339r&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 197, Oct. 1981, p. 339-350.
Astronomy and Astrophysics
Astronomy
13
Black Holes (Astronomy), Emission Spectra, Galactic Nuclei, Line Spectra, Quasars, Spectral Line Width, Active Galactic Nuclei, Astronomical Models, Disks (Shapes), Electron Scattering, Stellar Mass Accretion, Stellar Spectra
Scientific paper
Numerical computations of line profiles from a 'scattering illumination' black hole accretion disk model of quasars and active galactic nuclei are reported. Several models are proposed, and those with outflowing clouds are preferred, although they may have some difficulties with regard to line asymmetries. At low inclinations, when Doppler broadening dominates internal broadening mechanisms, and for appropriate choices of black hole mass and accretion rate, the model yields the observed range of slightly asymmetric line profiles. At moderate inclinations, the red-blue asymmetry is reduced, although the range of basic profiles is unchanged. When the scattered flux is not significant, a bell-shaped profile is obtained, which is in agreement with analytical results, and a triangular profile is obtained if scattering into the line of sight is important. In addition, internal broadening by electron scattering is found to improve agreement with observed logarithmic profiles.
Raine Derek J.
Smith Aaron
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