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)