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Systematic effects in the estimate of the local gamma-ray emissivity

We show in this letter that estimates of the local emissivity of γ-rays in the GeV-TeV range suffer uncertainties which are of the same order of magnitude as the current Fermi results. Primary cosmic-ray fluxes, cosmic-ray propagation, interstellar helium abundance and γ-ray production crosssections all affect the estimate of this quantity. We also show that the so-called nuclear enhancement factor -- though widely used so far to model the γ-ray emissivity -- is no longer a relevant quantity given the latest measurements of the primary cosmic ray proton and helium spectra.

preprint2011arXivOpen access
Timur DelahayePierre SalatiArmand FiassonMartin Pohl
astro-ph.GAastro-ph.HE
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Timur DelahayePierre SalatiArmand FiassonMartin Pohl

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