SIMBAD references

2021ApJ...907L..11P - Astrophys. J., 907, L11-L11 (2021/January-3)

Probing the cosmic-ray density in the inner Galaxy.

PERON G., AHARONIAN F., CASANOVA S., YANG R. and ZANIN R.

Abstract (from CDS):

The galactic diffuse γ-ray emission, as seen by Fermi Large Area Telescope (LAT), shows a sharp peak in the region around 4 kpc from the Galactic center, which can be interpreted either as due to an enhanced density of cosmic-ray accelerators or to a modification of the particle diffusion in that region. Observations of γ-rays originating in molecular clouds are a unique tool to infer the cosmic-ray density point by point, in distant regions of the Galaxy. We report here the analysis of 11 yr Fermi-LAT data, obtained in the direction of nine molecular clouds located in the 1.5-4.5 kpc region. The cosmic-ray density measured at the locations of these clouds is compatible with the locally measured one. We demonstrate that the cosmic-ray density gradient inferred from the diffuse gamma-ray emission is the result of the presence of cosmic-ray accelerators rather than a global change of the sea of Galactic cosmic rays due to their propagation.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Gamma-rays - Interstellar medium - Giant molecular clouds - Cosmic rays

Simbad objects: 13

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2021.06.25-09:19:23

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