Setting an upper limit for the total TeV neutrino flux from the disk of our Galaxy

Abstract

AbstractWe set an upper limit for the total TeV neutrino flux expected from the disk of our Galaxy in the region |l| < 30° and |b| < 2° probed by the ANTARES experiment. We include both the diffuse emission, due to the interaction of cosmic rays with the interstellar medium, and the possible contribution produced by gamma-ray Galactic sources. The neutrino diffuse emission is calculated under different assumptions for the cosmic ray spatial and energy distribution in our Galaxy. The source contribution is instead constrained by analysis of the gamma-ray TeV sources included in the H.G.P.S. catalog. In particular, we assume that the total gamma-ray flux produced by all the sources, resolved and unresolved by H.E.S.S., is produced via hadronic interaction and, hence, is coupled with neutrino emission. We compare our total neutrino flux with the recent ANTARES measurement of the neutrino from the Galactic Ridge. We show that the ANTARES best-fit flux requires the existence of a large source component, close to or even larger than the most optimistic predictions obtained with our approach.