Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.3104s&link_type=abstract
American Astronomical Society, 187th AAS Meeting, #31.04; Bulletin of the American Astronomical Society, Vol. 27, p.1327
Astronomy and Astrophysics
Astronomy
Scientific paper
We show that Comptonization in thermally stratified black-hole accretion plasmas can give rise to a spectral hardening above ~ 10 keV as observed in the X-ray spectra of black holes and which is generally attributed to reprocessing of the incident continuum by cold optically thick matter. The presence of the hardening in the incident continuum results in Fe Kalpha line emission with an equivalent width larger than that produced by a simple power law continuum. We also show that energy equipartition in two-temperature plasmas naturally produces power law X-ray spectra with energy indices alpha =~ 0.9 below 10 keV and cut offs near ~ 100 keV as are observed in the spectra of Seyfert AGNs. We model the high energy spectra from black holes in a self-consistent manner including primary and reprocessed radiation from the accretion disk in addition to the Comptonized emission from the thermally stratified accretion plasma.
Dermer Carles D.
Skibo Jeffery G.
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