Gamma rays of 1-30 MeV from the Galactic Center Region

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Spectroscopy, Galactic Nuclei, Gamma Ray Spectra, Milky Way Galaxy, Radiant Flux Density, Compton Effect, Particle Collisions, Positron Annihilation, Spectral Energy Distribution

Scientific paper

Preliminary results are reported for gamma rays from the Galactic Center Region at 1-30 MeV made with a balloon-borne double Compton scatter gamma ray telescope. The Compton scatter angle, energy, and arrival time of the incident gamma ray and direction of the Compton scattered secondary for downward-moving gamma rays were measured. The handling of the data is described, and the results of Monte Carlo simulation angular resolutions and absolute efficiencies for different zenith angles of incident gamma rays are given. A contour sky map of the weighted fluxes for a southern sky region is shown whose primary feature is a significant enhancement in the Galactic Center Region. It is concluded that several discrete sources contribute to broaden the maximum in the horizontal or RA direction. Less broadening is indicated along the galactic plane.

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