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The source and distribution of Galactic positronsThe oriented scintillation spectrometer experiment (OSSE) observations of the Galactic plane and the Galactic center region were combined with observations acquired with other instruments in order to produce a map of the Galactic 511 keV annihilation radiation. Two mapping techniques were applied to the data: the maximum entropy method, and the basis pursuit inversion method. The resulting maps are qualitatively similar and show evidence for a central bulge and a weak galactic disk component. The weak disk is consistent with that expected from positrons produced by the decay of radioactive Al-26 in the interstellar medium. Both maps suggest an enhanced region of emission near l = -4 deg, b = 7 deg, with a flux of approximately 50 percent of that of the bulge. The existence of this emission appears significant, although the location is not well determined. The source of this enhanced emission is presently unknown.
Document ID
19970025733
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Purcell, W. R.
(Northwestern Univ. Evanston, IL United States)
Dixon, D. D.
(California Univ. Riverside, CA United States)
Cheng, L.-X.
(Maryland Univ. College Park, MD United States)
Leventhal, M.
(Maryland Univ. College Park, MD United States)
Kinzer, R. L.
(Naval Research Lab. Washington, DC United States)
Kurfess, J. D.
(Naval Research Lab. Washington, DC United States)
Skibo, J. G.
(Naval Research Lab. Washington, DC United States)
Smith, D. M.
(California Univ. Berkeley, CA United States)
Tueller, J.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Date Acquired
August 17, 2013
Publication Date
March 1, 1997
Publication Information
Publication: Proceedings of 2nd INTEGRAL Workshop 'The Transparent Universe'
Subject Category
Space Radiation
Accession Number
97N25203
Funding Number(s)
CONTRACT_GRANT: NAG5-2822
CONTRACT_GRANT: NASA Order S-10987-C
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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