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Title:
Interpretation of the gamma-ray bump from Cygnus X-1
Authors:
Liang, Edison P.; Dermer, Charles D.
Affiliation:
AA(Lawrence Livermore National Laboratory, Livermore, CA), AB(Lawrence Livermore National Laboratory, Livermore, CA)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 325, Feb. 15, 1988, p. L39-L42. (ApJL Homepage)
Publication Date:
02/1988
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Gamma Ray Spectra, Spectrum Analysis, Stellar Spectra, X Ray Binaries, X Ray Sources, Accretion Disks, Black Holes (Astronomy), High Temperature Plasmas, Spectral Energy Distribution
DOI:
10.1086/185106
Bibliographic Code:
1988ApJ...325L..39L

Abstract

The strong 0.5-2 MeV gamma-ray bump of Cyg X-1 recently reported by HEAO 3 observers can be interpreted self-consistently as the emission from a hot (kT of about 400 keV) pair-dominated plasma. The emission region parameters are uniquely determined by the spectral fit and observed luminosity via the pair-balance condition, suggesting that the gamma rays are produced in the inner region of the accretion flow at the expense of the normal power-law hard X-rays.

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