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An observation of the Galactic center region with the HEXAGONE high resolution gamma-ray spectrometerThe Galactic center region was observed for 6 hours on May 22, 1989 from a high altitude balloon with the HEXAGONE high resolution gamma-ray spectrometer. The instrument had a 285 sq/cm array of cooled germanium detectors with an energy resolution of 2.2 keV at 511 keV and an 18 deg FWHM field of view. The 511 keV gamma-rays from electron-positron annihilation and 1809 keV gamma-rays from the radioactive decay of Al-26 were observed to have fluxes of 8.9 x 10 exp -4 and 1.9 x 10 exp -4 ph/cm-s, respectively. Continuum emission was detected from 20 to 800 keV and preliminary results have been obtained for the spectrum. Below 120 keV this is well described by power law with a slope of -2.6. In the 120-250 keV band the spectrum contains a broad linelike feature. This is interpreted as the result of Compton backscattering of about 511 keV photons from a compact source of electron-positron annihilation radiation.
Document ID
19920061000
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Matteson, J.
(NASA Headquarters Washington, DC United States)
Pelling, M.
(NASA Headquarters Washington, DC United States)
Bowman, B.
(NASA Headquarters Washington, DC United States)
Briggs, M.
(NASA Headquarters Washington, DC United States)
Gruber, D.
(NASA Headquarters Washington, DC United States)
Lingenfelter, R.
(NASA Headquarters Washington, DC United States)
Peterson, L.
(California, University La Jolla, United States)
Lin, R.
(NASA Headquarters Washington, DC United States)
Smith, D.
(NASA Headquarters Washington, DC United States)
Feffer, P.
(California, University Berkeley, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Subject Category
Astrophysics
Meeting Information
Meeting: International Symposium on Gamma-Ray Line Astrophysics
Location: Paris
Country: France
Start Date: December 10, 1990
End Date: December 13, 1990
Accession Number
92A43624
Funding Number(s)
CONTRACT_GRANT: NAGW-449
Distribution Limits
Public
Copyright
Other

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