High-Energy Spectral Complexity from Thermal Gradients in Black Hole Atmospheres

Details High-Energy Spectral Complexity from Thermal Gradients in Black Hole Atmospheres High-Energy Spectral Complexity from Thermal Gradients in Black Hole Atmospheres

1995-10-03

arxiv.org/abs/astro-ph/9510007v1

Astronomy and Astrophysics

Astrophysics

11 pages, uuencoded gziped postscript, ApJ Letters in press

Scientific paper

10.1086/309809

We show that Compton scattering of soft photons with energies near 100 eV in thermally stratified black-hole accretion plasmas with temperatures in the range 100 keV - 1 MeV can give rise to an X-ray spectral hardening near 10 keV. This could produce the hardening observed in the X-ray spectra of black holes, which is generally attributed to reflection or partial covering of the incident continuum source by cold optically thick matter. In addition, we show that the presence of very hot (kT=1 MeV) cores in plasmas leads to spectra exibiting high energy tails similar to those observed from Galactic black-hole candidates.

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