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Spectral Modeling of the EGRET 3EG Gamma Ray Sources Near the Galactic PlaneThe third EGRET catalog lists 84 sources within 10 deg of the Galactic Plane. Five of these are well-known spin-powered pulsars, 2 and possibly 3 others are blazars, and the remaining 74 are classified as unidentified, although 6 of these are likely to be artifacts of nearby strong sources. Several of the remaining 68 unidentified sources have been noted as having positional agreement with supernovae remnants and OB associations. Others may be radio-quiet pulsars like Geminga, and still others may belong to a totally new class of sources. The question of the energy spectral distributions of these sources is an important clue to their identification. In this paper, the spectra of the sources within 10 deg of Galactic Plane are fit with three different functional forms; a single power law, two power laws, and a power law with an exponential cutoff. Where possible, the best fit is selected with statistical tests. Twelve, and possibly an additional 5 sources, are found to have spectra that are fit by a breaking power law or by the power law with exponential cutoff function.
Document ID
20000026340
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Bertsch, D. L. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Hartman, R. C. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Hunter, S. D. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Thompson, D. J. (NASA Goddard Space Flight Center Greenbelt, MD United States)
Lin, Y. C. (Stanford Univ. Stanford, CA United States)
Kniffen, D. A. (NASA Headquarters Washington, DC United States)
Kanbach, G. (Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Mayer-Hasselwander, H. A. (Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Reimer, O. (Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Sreekumar, P. (Indian Space Research Organization Bangalore, India)
Date Acquired
August 19, 2013
Publication Date
January 1, 1999
Publication Information
Publication: EGRET Team Papers to be Published in the Proceedings of the Fifth Compton Symposium
Subject Category
Space Radiation
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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IDRelationTitle20000026337Collected WorksEGRET Team Papers to Be Published in the Proceedings of the Fifth Compton Symposium
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