Generalized Comptonization models and application to the recent high-energy observations

Details Generalized Comptonization models and application to the recent high-energy observations Generalized Comptonization models and application to the recent high-energy observations

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...434..570t&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 434, no. 2, p. 570-586

Astronomy and Astrophysics

Astronomy

416

Astronomical Models, Compton Effect, Opacity, Optical Thickness, Plasma Clouds, Plasma Temperature, Radiative Transfer, X Ray Sources, X Ray Spectra, Active Galactic Nuclei, Doppler Effect, Exosat Satellite, Fokker-Planck Equation, Gamma Function, Ginga Satellite, Seyfert Galaxies, X Ray Astronomy

Scientific paper

The theory of spectral formation in thermal X-ray sources, where the effects of Comptonization and Klein-Nishina corrections are important, is presented. Analytical expressions are obtained for the produced spectrum as a function of such input parameters as the plasma temperature, the optical depth of the plasma cloud and the injected soft photon spectrum. The analytical theory developed here takes into account the dependence of the scattering opacity on the photon energy. It is shown that the plasma temperature as well as the asymptotic rate of photon escape from the plasma cloud determine the shape of the upscattered hard tail in the emergent spectra, even in the case of very small optical depths. The escape distributions of photons are given for any optical depth of the plasma cloud and their asymptotic dependence for very small and large optical depths are examined. It is shown that this new generalized approach can fit spectra for a large variety of hard X-ray sources and determine the plasma temperature in the region of main energy release in Cyg X-1 and the Seyfert galaxy NGC 4151.

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