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Fluxes of diffuse gamma rays and neutrinos from cosmic-ray interactions with the circumgalactic gas

Oleg Kalashev1,* and Sergey Troitsky1,2,†

  • 1Institute for Nuclear Research of the Russian Academy of Sciences, 60th October Anniversary Prospect 7a, Moscow 117312, Russia
  • 2Moscow Institute for Physics and Technology, Institutskii pereulok 9, 141700 Dolgoprudny, Moscow Region, Russia

  • *kalashev@ms2.inr.ac.ru
  • †st@ms2.inr.ac.ru
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Phys. Rev. D 94, 063013 – Published 30 September, 2016

DOI: https://doi.org/10.1103/PhysRevD.94.063013

Abstract

The Milky Way is surrounded by a gravitationally bound gas corona extending up to the Galaxy’s virial radius. Interactions of cosmic-ray particles with this gas give rise to energetic secondary gamma rays and neutrinos. We present a quantitative analysis of the neutrino and gamma-ray fluxes from the corona of the Milky Way together with a combined contribution of coronae of other galaxies. The high-energy neutrino flux is insufficient to explain the IceCube results, while the contribution to the FERMI-LAT diffuse gamma-ray flux is not negligible.

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Phys. Rev. D 94, 063013– Published 30 September, 2016
  • Received 3 September 2016

© 2016 American Physical Society

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