Diffuse Neutrino and Gamma-ray Emissions of the Galaxy above the TeV

Abstract

We simulate the neutrino and $\gamma$-ray emissions of the Galaxy which are originated from the hadronic scattering of cosmic rays (CR) with the interstellar medium (ISM). Rather than assuming a uniform CR density, we estimate the spatial distribution of CR nuclei by means of numerical simulations. We consider several models of the galactic magnetic field and of the ISM distribution finding only a weak dependence of our results on their choice. We found that by extrapolating the predicted $\gamma$-ray spectra down to few GeV we get a good agreement with EGRET measurements. Then, we can reliably compare our predictions with available observations above the TeV both for the $\gamma$-rays and the neutrinos. We confirm that the excesses observed by MILAGRO in the Cygnus region and by HESS in the Galactic Centre Ridge cannot be explained without invoking significant CR over-densities in those regions. Finally, we discuss the perspectives that a km${}^3$ neutrino telescope based in the North hemisphere has to measure the diffuse emission from the inner Galaxy.

27 pages, 13 figures. Several figures have been added or replaced. A new model for the ISM distribution has been considered. Accepted for publication in JCAP

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• The gamma-ray and neutrino sky: A consistent picture of Fermi-LAT, Milagro, and IceCube results
• Unified interpretation of cosmic-ray nuclei and antiproton recent measurements
• Galactic Neutrinos in the TeV to PeV Range
• Dark Matter capture and annihilation on the First Stars: preliminary estimates
• Study of TeV Neutrinos with Upward Showering Muons in Super-Kamiokande
• Pulsar TeV Halos Explain the TeV Excess Observed by Milagro
• Escape model for Galactic cosmic rays and an early extragalactic transition
• Explaining the Spectra of Cosmic Ray Groups above the Knee by Escape from the Galaxy
• Stringent constraint on neutrino Lorentz-invariance violation from the two IceCube PeV neutrinos
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• Neutrinos and Cosmic Rays Observed by IceCube
• High Energy neutrino signals from the Epoch of Reionization
• Origin of Galactic sub-PeV diffuse gamma-ray emission: Constraints from high-energy neutrino observations
• High-energy neutrinos from Galactic superbubbles
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• Neutrino signal from extended Galactic sources in IceCube
• Galactic Diffuse Neutrino Emission from Sources beyond the Discovery Horizon
• Identifying Galactic Sources of High-Energy Neutrinos
• Unveiling the nature of galactic TeV sources with IceCube results
• Searching for High Energy Neutrino counterpart signals; The case of the Fermi Bubbles signal and of Dark Matter annihilation in the inner Galaxy
• Diffuse flux of galactic neutrinos and gamma rays
• A Hadronic Scenario for the Galactic Ridge
• Origin of the high energy neutrino flux at IceCube