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Preprints, Working Papers, ... Year : 2011

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

T. Delahaye
  • Function : Author
A. Fiasson
M. Pohl
  • Function : Author

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.

Dates and versions

in2p3-00652858 , version 1 (16-12-2011)

Identifiers

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

Cite

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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