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arxiv 1411.7623 v2 pith:33N2KB2I submitted 2014-11-27 astro-ph.HE hep-ph

Gamma-ray sky points to radial gradients in cosmic-ray transport

classification astro-ph.HE hep-ph
keywords galacticgamma-rayapproachcosmic-raylocaltransportaboveallowing
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The standard approach to cosmic-ray (CR) propagation in the Galaxy is based on the assumption that local transport properties can be extrapolated to the whole CR confining volume. Such models tend to underestimate the gamma-ray flux above few GeV measured by the Fermi Large Area Telescope towards the inner Galactic plane. We consider here for the first time a phenomenological scenario allowing for both the rigidity scaling of the diffusion coefficient and convective effects to be position-dependent. We show that within this approach we can reproduce the observed gamma-ray spectra at both low and mid Galactic latitudes - including the Galactic center - without spoiling any local CR observable.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

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