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Observation and search for gamma rays 1-20 MeV from the Crab, NGC 4151, Cyg X-1, Cyg X-3, CG 135+1 and 3C 273Observations and limiting values for the flux of 1-20 MeV gamma rays from the Crab, the Seyfert galaxy NGC 4151, the black hole candidate Cyg X-1, Cyg X-3 and the two nearest quasars CG 135+1 and 3C 273 are reported. Measurements of the energy and scatter angle of gamma rays at zenith angles between 10 and 30 deg were obtained by a balloon-borne double-scatter gamma-ray telescope. The flux from the Crab from 1.2 to 10 MeV is found to be 0.0039 + or - 0.0020 photons/sq cm per sec, and the energy distribution of the flux from 1.2 to 20 MeV is determined. Two-standard-deviation upper limits to the gamma-ray flux in the intervals 1.2-3, 3-5, 5-10 and 10-20 MeV of 0.0003, 0.0002, 0.00006 and 0.00004 photons/sq cm/sec are found for NGC 4151, Cyg X-1 and Cyg X-3, while those of 0.0005, 0.0003, 0.0001 and 0.00004 photons/sq cm per sec are determined for both quasars. These upper limits are interpreted as restricting confirmed gamma-ray sources to the Crab and NP 0532, and as evidence against Seyfert galaxies as the source of cosmic diffuse radiation.
Document ID
19800047683
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
White, R. S.
(California Univ. Riverside, CA, United States)
Gibbons, R.
(California Univ. Riverside, CA, United States)
Long, J. L.
(California Univ. Riverside, CA, United States)
Zanrosso, E. M.
(California Univ. Riverside, CA, United States)
Zych, A. D.
(California, University Riverside, Calif., United States)
Dayton, B.
(California State University Los Angeles, Calif., United States)
Date Acquired
August 10, 2013
Publication Date
April 17, 1980
Publication Information
Publication: Nature
Volume: 284
Subject Category
Astrophysics
Accession Number
80A31853
Distribution Limits
Public
Copyright
Other

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