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arXiv · 1710.11082

Galactic Cosmic-Rays in a Breeze

Gwenael Giacinti·Andrew M. Taylor
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Abstract

We study a scenario in which the Fermi bubbles are formed through a Galactocentric outflow of gas and pre-accelerated cosmic-rays (CR). We take into account CR energy losses due to proton-proton interactions with the gas present in the bubbles, and calculate the associated gamma-ray emission. We find that CRs diffusing and advecting within a breeze outflow result in an approximately flat surface brightness profile of the gamma-ray emission, as observed by Fermi satellite. Finally, we apply similar outflow profiles to larger Galactocentric radii, and investigate their effects on the CR spectrum and boron-to-carbon ratio. Hardenings can appear in the spectrum, even in cases with equal CR diffusion coefficients in the disk and halo.

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Gwenael Giacinti, Andrew M. Taylor. 2017-10-30. Galactic Cosmic-Rays in a Breeze. https://doi.org/10.1016/j.nuclphysbps.2018.07.010

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