Comptonization-softening and the hard X-ray spectrum of CYG X-1

Details Comptonization-softening and the hard X-ray spectrum of CYG X-1 Comptonization-softening and the hard X-ray spectrum of CYG X-1

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985ap%26ss.109..155g&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 109, no. 1, Feb. 1985, p. 155-173.

Astronomy and Astrophysics

Astrophysics

1

Compton Effect, X Ray Sources, X Ray Spectra, Annihilation Reactions, Bremsstrahlung, Electron Scattering, Energy Spectra, Pair Production, Photons, Radiant Flux Density

Scientific paper

The Comptonization-softening of very hard X-ray photons with E less than about m(0) c-squared in the 'cold' electron gas is discussed. The frequency diffusion equation for Comptonization of hard X-rays has been derived to the zero-temperature approximation. By use of this equation, and under the assumption of pair-annihilation origin of hard X-rays, the energy spectrum with E over 80 keV is calculated for Cyg X-1, in good fit with observation. The high-energy edge of about 400 keV of the observed spectrum and the small bump in the range 100-200 keV also can be explained this way.

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