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The gamma-ray spectrum of Centaurus A: A high-resolution observation between 70 keV and 8 MeVThe NASA/Goddard Space Flight Center Low Energy Gamma ray Spectrometer (LEGS) observed the nearby active nucleus galaxy Centaurus A (NGC 5128) during a balloon flight on 1981 November 19. There is no evidence of a break in the spectrum or of any line features. The 1.6 MeV limit is a factor of 8 lower than the 1974 line flux, indicating that, if the 1974 feature was real, and, if it was narrow, then the line intensity decreased significantly between 1974 and 1981. The lack of observed annihilation radiation from Cen A, combined with the temporal variations that are seen in the X-ray and gamma-ray intensities, constrain the size of the emission region to be between 10 to the 13th power and 5 x 10 to the 17th power cm.
Document ID
19830027719
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
Gehrels, N. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Cline, T. L. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Teegarden, B. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Paciesas, W. S. (Maryland Univ. College Park, United States)
Tueller, J. (Maryland Univ. College Park, United States)
Durouchoux, P. (CEA Gif-sur-Yvette, France)
Hameury, J. M. (CEA Gif-sur-Yvette, France)
Date Acquired
September 4, 2013
Publication Date
August 1, 1983
Subject Category
Space Radiation
Report/Patent Number
NAS 1.15:85081
NASA-TM-85081
Accession Number
83N35990
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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