On the origin of power-law X-ray spectra of active galactic nuclei

Details On the origin of power-law X-ray spectra of active galactic nuclei On the origin of power-law X-ray spectra of active galactic nuclei

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...287..534s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 287, Dec. 15, 1984, p. 534-537. Research supported by the L. Deutch Researc

Astronomy and Astrophysics

Astrophysics

9

Accretion Disks, Active Galactic Nuclei, Optical Thickness, Quasars, Seyfert Galaxies, X Ray Spectra, Bl Lacertae Objects, Luminosity, Power Spectra, Schwarzschild Metric

Scientific paper

In the present analytical model for a power law X-ray continuum production in active galactic nuclei, the dissipation of turbulent energy flux above the accretion disk forms an optically thin transition layer with an inverted temperature gradient. The emitted thermal radiation has a power law spectrum in the 0.1-100 keV range, with a photon energy spectral index gamma of about 0.4-1.0. Thermal X-ray contribution from the layer is 5-10 percent of the total disk luminosity. The gamma value of 0.75 is suggested as a 'natural' power law index for Seyfert galaxies and QSOs.

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