Gamma-Ray Spectral Variability of Cygnus X-1

Details Gamma-Ray Spectral Variability of Cygnus X-1 Gamma-Ray Spectral Variability of Cygnus X-1

2001-06-04

arxiv.org/abs/astro-ph/0106045v1

Astronomy and Astrophysics

Astrophysics

5 pages, submitted to the proceedings of the GAMMA 2001 High Energy Astrophysics Symposium (Baltimore, April 4-6, 2001)

Scientific paper

10.1063/1.1419379

We have used observations from CGRO to study the variation in the MeV emission of Cygnus X-1 between its low and high X-ray states. These data provide a measurement of the spectral variability above 1 MeV. The high state MeV spectrum is found to be much harder than that of the low state MeV spectrum. In particular, the power-law emission seen at hard X-ray energies in the high state spectrum (with a photon spectral index of 2.6) is found to extend out to at least 5 MeV, with no evidence for any cutoff. Here we present the data and describe our efforts to model both the low state and high state spectra using a hybrid thermal/nonthermal model in which the emission results from the Comptonization of an electron population that consists of both a thermal and nonthermal component.

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