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A New Determination of the Extragalactic Diffuse X-Ray Background from EGRET DataWe use the GALPROP model for cosmic-ray propagation to obtain a new estimate of the Galactic component of gamma rays, and show that away from the Galactic plane it gives an accurate prediction of the observed EGRET intensities in the energy range 30 MeV - 50 GeV. On this basis we re-evaluate the extragalactic gamma-ray background. We find that for some energies previous work underestimated the Galactic contribution at high latitudes and hence overestimated the background. Our new background spectrum shows a positive curvature similar to that expected for models of the extragalactic emission based on the blazar population.
Document ID
20040081217
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Strong, Andrew W.
(Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Moskalenko, Igor V.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Reimer, Olaf
(Ruhr Univ. Bochum, Germany)
Date Acquired
September 7, 2013
Publication Date
January 1, 2004
Subject Category
Space Radiation
Funding Number(s)
CONTRACT_GRANT: B<BF-QV0002
Distribution Limits
Public
Copyright
Public Use Permitted.
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