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

Abstract : We show in this letter that estimates of the local emissivity of {\gamma}-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 {\gamma}-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 {\gamma}-ray emissivity -- is no longer a relevant quantity given the latest measurements of the primary cosmic ray proton and helium spectra.
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http://hal.in2p3.fr/in2p3-00652858
Contributor : Claudine Bombar <>
Submitted on : Friday, December 16, 2011 - 2:41:10 PM
Last modification on : Tuesday, November 17, 2020 - 2:36:03 PM

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  • HAL Id : in2p3-00652858, version 1
  • ARXIV : 1109.0834

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T. Delahaye, P. Salati, A. Fiasson, M. Pohl. Systematic effects in the estimate of the local gamma-ray emissivity. 2011. ⟨in2p3-00652858⟩

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