Cosmic Ray propagation in the Galaxy and diffuse gamma-ray emission

Details Cosmic Ray propagation in the Galaxy and diffuse gamma-ray emission Cosmic Ray propagation in the Galaxy and diffuse gamma-ray emission

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1085..380e&link_type=abstract

HIGH ENERGY GAMMA-RAY ASTRONOMY: Proceedings of the 4th International Meeting on High Energy Gamma-Ray Astronomy. AIP Conferenc

Astronomy and Astrophysics

Astronomy

Cosmic Rays, Gamma-Ray Sources, Gamma-Ray Bursts, Supernova Remnants

Scientific paper

We model the propagation of galactic cosmic-ray nuclei with energy above 1 GeV using DRAGON, a new numerical code. We test our code by considering the case of a uniform diffusion coefficient D along the Galactic Plane. Then, for the first time, we also study the case in which D traces the radial distribution of Galactic Supernova Remnants. In both cases we consistently match the observed B/C, as well as other primary/primary nuclide ratios, and the antiproton/proton spectrum. Moreover, we compute the hadronic contribution to the diffuse γ-ray emission of the Galaxy along the galactic plane, and we point out that the radial dependence of the diffusion coefficient may offer an alternative solution to the well-known gradient problem.

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