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05 February 2025

» arxiv » astro-ph/0106045

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Gamma-Ray Spectral Variability of Cygnus X-1
M. L. McConnell ; K. Bennett ; H. Bloemen ; W. Collmar ; W. Hermsen ; L. Kuiper ; W. Paciesas ; B. Phlips ; J. Poutanen ; J. M. Ryan ; V. Schoenfelder ; H. Steinle ; A. W. Strong ; A. A. Zdziarski ;
Date:	4 Jun 2001
Subject:	astro-ph
Abstract:	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.
Source:	arXiv, astro-ph/0106045
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