High Energy Neutrinos from Astrophysical Sources: An Upper Bound
Abstract
We show that cosmic-ray observations set a model-independent upper bound to the flux of high-energy, > 1014 eV, neutrinos produced by photo-meson (or p-p) interactions in sources of size not much larger than the proton photo-meson (or pp) mean-free-path. The bound applies, in particular, to neutrino production by either AGN jets or GRBs. This upper limit is two orders of magnitude below the flux predicted in some popular AGN jet models, but is consistent with our predictions from GRB models. We discuss the implications of these results for future km2 high-energy neutrino detectors.
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