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High energy galactic gamma radiation from cosmic rays concentrated in spiral armsA model for the emission of high energy ( 100 MeV) gamma rays from the galactic disk was developed and compared to recent SAS-2 observations. In the calculation, it is assumed that (1) the high energy galactic gamma rays result primarily from the interaction of cosmic rays with galactic matter; (2) on the basis of theoretical and experimental arguments the cosmic ray density is proportional to the matter density on the scale of galactic arms; and (3) the matter in the galaxy, atomic and molecular, is distributed in a spiral pattern consistent with density wave theory and the experimental data on the matter distribution.
Document ID
19750007509
Acquisition Source
Legacy CDMS
Document Type
Preprint (Draft being sent to journal)
Authors
Bignami, G. F. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Fichtel, C. E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Thompson, D. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kniffen, D. A. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 3, 2013
Publication Date
December 1, 1974
Subject Category
Space Radiation
Report/Patent Number
NASA-TM-X-70818
X-662-75-2
Report Number: NASA-TM-X-70818
Report Number: X-662-75-2
Meeting Information
Meeting: High energy galactic gamma radiation from commic rays concentrated in spiral arms
Location: Greenbelt, MD
Country: United States
Start Date: December 1, 1974
Accession Number
75N15581
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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