Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989esasp.296..981m&link_type=abstract
In ESA, The 23rd ESLAB Symposium on Two Topics in X Ray Astronomy. Volume 2: AGN and the X Ray Background p 981-984 (SEE N90-258
Astronomy and Astrophysics
Astronomy
Accretion Disks, Active Galactic Nuclei, Astronomical Models, Compton Effect, Temperature, Dynamic Models, Emission Spectra, Galactic Structure, Photon Density, Viscosity
Scientific paper
The standard model of an accretion disk is considered. The temperature in the inner region is computed. It is assumed that the radiated power derives from comptonized photons, produced in a homogeneous single temperature plasma, supported by radiation pressure. The photon production mechanisms are purely thermal. Three different approximations for the effects of comptonization on the energy loss are used. The maximum temperature is very sensitive to the accretion rate and viscosity parameters. For high viscosity and accretion rate the emission spectra show a flat component following a peak corresponding to the temperature of the innermost optically thick annulus. For 10 to the 8th power of the solar mass the peak is in the ultraviolet and the flat component appears above 1 keV. The model can thus potentially account for the ultraviolet excess as well as for the X-ray spectra observed in active galactic nuclei.
Maraschi Laura
Molendi Silvano
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