1975•The Astrophysical JournalRequires access
Upper limits of hard gamma-ray emission from six X-ray sources
M. Campbell, J. K. Alexander, Jr. Ball S. E., K. Greisen, D. Koch, B. McBreen
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Abstract
The Cornell 100-inch gamma-ray telescope has been used to set upper limits for the gamma-ray flux above 400 MeV from the X-ray sources Cyg X-1, Cyg X-2, Cyg X-3, Cas A, Cas B, and Per X-1. An upper limit for the diffuse flux of the galactic disk was set which is consistent with OSO-3 and SAS-2 data. A new measurement of the atmospheric gamma-ray generation rate is presented.