Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....59..127c&link_type=abstract
Astronomy and Astrophysics, vol. 59, no. 1, July 1977, p. 127-131.
Astronomy and Astrophysics
Astrophysics
15
Astronomical Models, Disks (Shapes), Luminous Intensity, Mass Flow Rate, Quasars, Emission Spectra, Galactic Radiation, Mass Transfer, Optical Properties, Stellar Mass Accretion, Thermal Emission
Scientific paper
The accretion-disk model for the optical continuum of QSOs has been investigated using the standard viscous-stress ('alpha-P') formalism. It is found that with a maximum allowable mass of 10 billion solar masses, the standard model with sub-Eddington flow falls a factor of 10 short of the luminosity of the brightest QSOs. Models with the higher mass-flow rates required to reach the maximum luminosities produce most of their energy in an optically thin region which has not yet been self-consistently treated. The disk model with sub-Eddington flow has difficulty in producing a power law of the correct slope over the optical band. It is suggested that nonthermal processes may be needed to explain the optical properties of QSOs.
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