Fluxes of diffuse gamma rays and neutrinos from cosmic-ray interactions with the circumgalactic gas
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.
Physical Review D
- Pub Date:
- September 2016
- Astrophysics - High Energy Astrophysical Phenomena
- 17 pages, 7 figures, revtex. V2: minor changes, version accepted by PRD