Broad-Band Gamma-Ray Spectra of Cygnus X-1

Astronomy and Astrophysics – Astronomy

Scientific paper

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Black Holes (Astronomy), Energy Spectra, X Ray Binaries, Spaceborne Astronomy, Gamma Ray Astronomy, Gamma Ray Observatory

Scientific paper

The data collected by the COMPTEL experiment on CGRO provides an unprecedented opportunity to study the high energy spectrum of the galactic black hole candidate Cygnus X-1. A proper interpretation of the high energy spectrum, however, requires simultaneous knowledge of the spectrum at lower energies. Taken collectively, the instruments on CGRO afford the capability to study the nature of the broad band high energy spectrum of Cygnus X-1. This program is intended to more fully analyze the numerous observations of Cygnus X-1 that have been conducted during the course of the CGRO mission. In the past, these studies have been somewhat hindered by discrepancies between the spectra measured with BATSE and OSSE. We have recently been able to move beyond this problem to provide a more detailed analysis of the Cygnus X-1 spectrum and its variability at MeV energies.

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