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Spectrum and variation of gamma-ray emission from the galactic center regionContinuum emission at 60-300 keV from the galactic center region was observed to decrease in intensity by 45 percent and to show a spectrum steepening between fall 1979 and spring 1980. At the same time 511 keV positron annihilation radiation decreased by a comparable fraction. No variations over shorter time scales were detected. The observations are consistent with a model where positrons and hard X-rays are produced in an electromagnetic cascade near a massive black hole.
Document ID
19820046860
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Riegler, G. R.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Ling, J. C.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Mahoney, W. A.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Wheaton, W. A.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Jacobson, A. S.
(California Institute of Technology, Jet Propulsion Laboratory, Pasadena CA, United States)
Date Acquired
August 10, 2013
Publication Date
January 1, 1982
Subject Category
Astronomy
Meeting Information
Meeting: International Cosmic Ray Conference
Location: Paris
Country: France
Start Date: July 13, 1981
End Date: July 25, 1981
Accession Number
82A30395
Funding Number(s)
CONTRACT_GRANT: NAS7-100
Distribution Limits
Public
Copyright
Other

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