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Galactic plane gamma-radiationAnalysis of the SAS 2 data together with the COS B results shows that the distribution of galactic gamma-radiation has several similarities to that of other large-scale tracers of galactic structure. The radiation is primarily confined to a thin disc which exhibits offsets from b = 0 degrees similar to warping at radio frequencies. The principal distinction of the gamma-radiation is a stronger contrast in intensity between the region from 310 to 45 degrees in longitude and the regions away from the center that can be attributed to a variation in cosmic-ray density as a function of position in Galaxy. The diffuse galactic gamma-ray energy spectrum shows no significant variation in direction, and the spectrum seen along the plane is the same as that for the galactic component of the gamma-radiation at high altitudes. The uniformity of the galactic gamma-ray spectrum, the smooth decrease in intensity as a function of altitude, and the absence of any galactic gamma-ray sources at high altitudes indicate a diffuse origin for bulk of the galactic gamma-radiation rather than a collection of localized sources.
Document ID
19790053795
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Hartman, R. C.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kniffen, D. A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Thompson, D. J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Fichtel, C. E.
(NASA Goddard Space Flight Center Greenbelt, Md., United States)
Ogelman, H. B.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Tumer, T.
(Cukurova University Adana, Turkey)
Ozel, M. E.
(Middle East Technical University Ankara, Turkey)
Date Acquired
August 9, 2013
Publication Date
June 1, 1979
Publication Information
Publication: Astrophysical Journal
Subject Category
Space Radiation
Accession Number
79A37808
Distribution Limits
Public
Copyright
Other

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