Massive thin accretion discs. I - Calculated spectra

Details Massive thin accretion discs. I - Calculated spectra Massive thin accretion discs. I - Calculated spectra

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.238..897l&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 238, June 1, 1989, p. 897-916. Research supported by th

Statistics

Computation

222

Accretion Disks, Active Galactic Nuclei, Astronomical Spectroscopy, Computational Astrophysics, Eddington Approximation, Electron Scattering, Optical Thickness, Radiation Pressure, Radiative Transfer, Surface Temperature

Scientific paper

Detailed calculations of the structure and spectrum of massive geometrically thin 'bare' accretion disks were obtained, solving the radiative transfer equations using the Eddington approximation for an atmosphere with a vertical temperature gradient. The results show alpha disks to be radiation pressure dominated throughout the region where self-gravity dominates. In contrast to previous findings, the surface temperature is found to be close to the effective temperature, even for regions where electron scattering effects are significant. From the upper limit on the accretion rate it is inferred that thin disks without coronas do not have sufficient soft X-ray flux to explain the observations of bright quasars.

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