REVIEWS OF TOPICAL PROBLEMS: Gamma rays and the structure of the Galaxy

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Scientific paper

The observations and theoretical interpretations of galactic γ rays in the energy region 107-1010 eV are reviewed. Galactic γ rays consist of a diffuse component and radiation from discrete sources. The diffuse component, which is formed as the result of interaction of cosmic rays with interstellar gas, reflects the large-scale structure of the Galaxy. Recent observations have revealed the existence of a belt of molecular hydrogen at a distance 4-8 kpc from the Galactic Center and indicate a nonuniformity of the distribution of cosmic rays over the disk and in the halo of the Galaxy. Information on the small-scale structure of the Galaxy in the γ region is obtained from the discrete γ-ray sources, of which more than twenty have now been observed. The best known of these are the pulsars in the Crab Nebula, Vela-X, Cygnus X-3, and the region of the Galactic Center. Possible mechanisms for the γ radiation of discrete sources are discussed.

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