Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244.1081d&link_type=abstract
Astrophysical Journal, Part 1, vol. 244, Mar. 15, 1981, p. 1081-1086.
Astronomy and Astrophysics
Astronomy
4
Astronomical Spectroscopy, Galactic Nuclei, Gamma Ray Astronomy, Balloon Flight, Gamma Ray Telescopes, Radiant Flux Density
Scientific paper
The 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.
Chupp Edward L.
Dunphy Philip P.
Forrest David J.
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