http://arxiv.org/abs/1907.03102
Various studies firmly establish the fact that gamma-ray observations can act as a unique probe to detect the possible cosmic ray (CR) sources, study the CR density distribution and explore the average properties of interstellar medium (ISM) such as the gas density profile of ISM. We use the DRAGON code to study different propagation models by incorporating realistic source distribution, Galactic magnetic field (GMF) and gas density profile, and finally obtain the proton distribution (both spatial and energy) in the Galaxy by fitting the locally observed CR spectra. This distribution of protons is used to calculate the diffuse gamma-ray flux produced by proton-proton interactions in the Galactic halo. Our calculated diffuse gamma-ray flux is compared with the isotropic gamma-ray background (IGRB) at sub-TeV energy regime measured by Fermi-LAT. It is found to be much less than IGRB, which suggests IGRB is mostly of extragalactic origin.
S. Biswas and N. Gupta
Tue, 9 Jul 19
62/81
Comments: 15 pages, 7 figures
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