Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.263..641s&link_type=abstract
In ESA Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE p 641-64
Astronomy and Astrophysics
Astrophysics
9
Accretion Disks, Active Galactic Nuclei, Astronomical Models, Galaxies, Quasars, Electron Scattering, Emission Spectra, Relativistic Effects, Stellar Atmospheres
Scientific paper
The authors present new calculations of the predicted spectra of accretion disks hypothesized to produce the strong optical and ultraviolet flux in quasars and active galactic nuclei. Two improvements make the new spectra more realistic than previous calculations by Malkan. The spectrum of radiation leaving the disk surface is now described by non-LTE stellar atmospheres with high effective temperatures (15.000 - 150.000K) and low gravities rather than local blackbody approximations. The dominance of electron scattering opacity in the stellar atmospheres leads to spectra significantly harder than blackbodies of the same effective temperatures. The authors have also included the strong general relativistic effects of disk inclination on the spectrum seen by distant observers. Both of the effects considered here lead to significantly lower estimates of accretion rates in quasars observed with IUE.
Malkan Matthew A.
Sun Wei-hsin
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