Observations of medium-energy gamma-ray emission from the galactic center region

Details Observations of medium-energy gamma-ray emission from the galactic center region Observations of medium-energy gamma-ray emission from the galactic center region

Oct 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225..591k&link_type=abstract

Astrophysical Journal, Part 1, vol. 225, Oct. 15, 1978, p. 591-598.

Astronomy and Astrophysics

Astronomy

12

Balloon-Borne Instruments, Cosmic Rays, Galactic Nuclei, Gamma Ray Astronomy, Milky Way Galaxy, Spectral Energy Distribution, Bremsstrahlung, Calibrating, Cerenkov Counters, Galactic Radiation, Interstellar Gas

Scientific paper

Measurements of the gamma-ray emission in the medium-energy range between 15 and 100 MeV, obtained during two balloon flights from Brazil, are presented. The importance of this energy region in determining whether neutral-pion decay or electron bremsstrahlung is the most likely dominant source mechanism is discussed, along with the implications of such observations. Specifically, the data from this experiment suggest that emission from the galactic plane is similar to the theoretical spectrum calculated by Fichtel et al. (1976), including both source mechanisms but with the bremsstrahlung component enhanced by a factor of about 2. A spectral distribution of gamma-rays produced in the residual atmosphere above the instrument is also presented and compared with other data. A rather smooth spectral variation from high to low energies is found for the atmospheric spectrum.

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