Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2011-10-26
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
4 pages, 7 figures, 1 table, 2011 Fermi Symposium proceedings - eConf C110509
Scientific paper
The spectral data on the diffuse Galactic gamma-rays, at medium and high latitudes (|b| > 10) and energies of 1-100 GeV, recently published by the Fermi Collaboration are used to produce a novel study on the gamma-ray emissivity in the Galaxy. We focus on analyzing the properties of propagation of cosmic rays (CRs), using the publicly available DRAGON code. We critically address some of the models for the interstellar HI and H2 gas distributions commonly used in the literature, as well as test a variety of propagation models. Each model assumes a distinct global profile for the diffusion and the re-acceleration of CRs. Fitting propagation parameters to well measured local CRs such as, the B/C ratio, protons, antiprotons and electron, positron fluxes, we evaluate the gamma-ray spectra at medium and high latitudes in order to place further constraints on these propagation models.
Cholis Ilias
Evoli Carmelo
Tavakoli Maryam
Ullio Piero
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