Spectral energy distributions of active galactic nuclei from an accretion disk with advective coronal flow

To explain the broad-band spectral energy distributions (SED) of Seyfert nuclei and QSOs, we study the emission spectrum emerging from a vertical disk–corona structure composed of a two-temperature plasma by solving hydrostatic equilibrium and radiative transfer self-consistently. Our model can nice...

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Bibliographic Details
Published in:New astronomy reviews 2000-09, Vol.44 (7), p.443-445
Main Authors: Kawaguchi, Toshihiro, Shimura, Toshiya, Mineshige, Shin
Format: Article
Language:English
Subjects:
Accretion
Accretion disks
Radiation mechanisms: miscellaneous
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Summary:To explain the broad-band spectral energy distributions (SED) of Seyfert nuclei and QSOs, we study the emission spectrum emerging from a vertical disk–corona structure composed of a two-temperature plasma by solving hydrostatic equilibrium and radiative transfer self-consistently. Our model can nicely reproduce the soft X-ray excess with α ( L ν ∝ ν − α ) of about 1.5 and the hard tail extending to ∼50 keV with α∼0.5. The different spectral slopes ( α∼1.5 below 2 keV and ∼0.5 above) are the results of different emission mechanisms: unsaturated Comptonization in the former and a combination of Comptonization, bremsstrahlung, and reflection of the coronal radiation at the disk–corona boundary in the latter.
ISSN:1387-6473
1872-9630
DOI:10.1016/S1387-6473(00)00077-4