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Limit on galactic 6.13 MeV gamma-ray lineThe University of New Hampshire large gamma-ray detector observed the galactic center region during a balloon flight from Alice Springs, Australia on 1977 November 21-22. The absence of any observable line at 6.13 MeV or its escape-peak energy makes it possible to place an upper limit of 8.1 x 10 to the -4th photons/(sq cm s) at the 99% confidence level on the 0-16 de-excitation line at this energy from the galactic disk in the direction of the center. This limit restricts the interpretation given by Willett et al. (1979) of the line at 6.13 MeV which they observed while viewing the galactic anticenter. The present results indicate that it is highly unlikely that the line which these authors report is due to dark nebulae or the quiet sun. Possible explanations for their observation are atmospheric background, local production in the detector, a localized cosmic source in the direction of the galactic anticenter, or a statistical fluctuation.
Document ID
19810046945
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Dunphy, P. P.
(New Hampshire Univ. Durham, NH, United States)
Forrest, D. J.
(New Hampshire Univ. Durham, NH, United States)
Chupp, E. L.
(New Hampshire, University Durham, N.H., United States)
Date Acquired
August 11, 2013
Publication Date
March 15, 1981
Publication Information
Publication: Astrophysical Journal
Subject Category
Astrophysics
Accession Number
81A31349
Funding Number(s)
CONTRACT_GRANT: NGL-30-002-021
Distribution Limits
Public
Copyright
Other

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