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

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.

17 pages, 7 figures, revtex. V2: minor changes, version accepted by PRD

References in corpus (8)

• The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV
• Constraining the Milky Way's Hot Gas Halo with OVII and OVII Emission Lines
• A Galactic Halo Origin of the Neutrinos Detected by IceCube
• Star Formation and Stellar Mass Assembly in Dark Matter Halos: From Giants to Dwarfs
• Neutrino yield from Galactic cosmic rays
• IceCube astrophysical neutrinos without a spectral cutoff and (10^15-10^17) eV cosmic gamma radiation
• Enhanced Pomeron diagrams: re-summation of unitarity cuts
• Density and metallicity of the Milky-Way circumgalactic gas

Cited by in corpus (7)

• Constraints on Galactic Neutrino Emission with Seven Years of IceCube Data
• Giant cosmic ray halos around M31 and the Milky Way
• Carpet-2 search for PeV gamma rays associated with IceCube high-energy neutrino events
• Measuring the Mass of Missing Baryons in the Halo of Andromeda Galaxy with Gamma-Ray Observations
• Upper limits on the isotropic diffuse flux of cosmic PeV photons from Carpet-2 observations
• On the contribution of cosmic-ray interactions in the circumgalactic gas to the observed high-energy neutrino flux
• New limit on high Galactic latitude PeV gamma-ray flux from Tibet AS-gamma data