Compttonization-softening and the hard X-ray spectrum of CYG X-1 |
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| Authors: | Ye Zhong Guo You Junhan |
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| Institution: | (1) Center for astrophysics, University of Science and Technology of China, Hefei, Anhui, China;(2) Present address: Kapteyn Laboratory, Groningen, The Netherlands |
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| Abstract: | The Comptonization-softening of very hard X-ray photons withE m
0
c
2 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, we calculated the energy spectrum withE>80 keV, for Cyg X-1, which is in good fit with the observation. The high-energy edge  400 keV of the observed spectrum and the small bump in the range 100–200 keV also can be explained by this way. |
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