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Gamma-Ray Spectra & Variability of Cygnus X-1 Observed by BATSE

J. C. Ling, A. Wheaton, P. Wallyn, W. A. Mahoney, W. Paciesas, B. A. Harmon, G. J. Fishman, S. N. Zhang, Xuefeng Hua

Abstract

We present new BATSE Earth occultation observations of the 25 keV-1.8 MeV spectrum and variability of Cygnus X-1 made between August 1993 and May 1994. We observed that the normal soft gamma-ray spectrum (gamma2) of Cygnus X-1 has two components: a Comptonized part seen below 30keV, and a high-energy tail in the 0.3-2 MeV range.

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Key concepts: Physics, Astrophysics, Spectral line, Gamma ray, Occultation, Range (aeronautics), Energy spectrum, Astronomy