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Gamma-Ray Observations Of Cygnus X-1 And Cygnus X-3 Using A Coded-Aperture Telescope, Mark L. Mcconnell, D J. Forrest, A Owens, P. P. Dunphy, W T. Vestrand, E. L. Chupp

Physics & Astronomy

A balloon-borne coded-aperture telescope, measuring gamma-ray photons in the 160 keV to 9.3 MeV range, was used to observe the Cygnus region of the sky on October 1 and 2, 1984. In the 2-9.3-MeV band, evidence is found for a hard spectral component with a mean flux level at the top of the atmosphere of 7.4 + or - 2.5 x 10 to the -7th photons/sq cm per s per keV, inconsistent with the predictions of the inverse Compton models normally used to describe the X-ray emission. Both Cyg X-1 and Cyg X-3 could be observed simultaneously with the telescope. …