Comparison of high-energy galactic and atmospheric tau neutrino flux

Abstract

We compare the tau neutrino flux arising from the galaxy and the earth atmosphere for 10(3) <= E/GeV <= 10(11). The intrinsic and oscillated tau neutrino fluxes from both sources are calculated. The intrinsic galactic v(tau) flux (E >= 10(3) GeV) is calculated by considering the interactions of high-energy cosmic-rays with the matter present in our galaxy, whereas the oscillated galactic v, flux is coming from the oscillation of the galactic v(mu), flux. For the intrinsic atmospheric v, flux, we extend the validity of a previous calculation from E <= 10(6) GeV up to E <= 10(11) GeV. The oscillated atmospheric v, flux is, on the other hand, rather suppressed. We find that, for 10(3) <= E/GeV <= 5.10(7), the oscillated v(tau) flux along the galactic plane dominates over the maximal intrinsic atmospheric v(tau) flux, i.e., the flux along the horizontal direction.