Hidden Cosmic-Ray Accelerators as an Origin of TeV-PeV Cosmic Neutrinos

Abstract

The latest IceCube data suggest that the all-flavor cosmic neutrino flux may be as large as 10^-7 GeV/cm^2/s/sr around 30 TeV. We show that, if sources of the TeV-PeV neutrinos are transparent to gamma rays with respect to two-photon annihilation, strong tensions with the isotropic diffuse gamma-ray background measured by Fermi are unavoidable, independently of the production mechanism. We further show that, if the IceCube neutrinos have a photohadronic (pgamma) origin, the sources are expected to be opaque to 1-100 GeV gamma rays. With these general multimessenger arguments, we find that the latest data suggest a population of cosmic-ray accelerators hidden in GeV-TeV gamma rays as a neutrino origin. Searches for x-ray and MeV gamma-ray counterparts are encouraged, and TeV-PeV neutrinos themselves will serve as special probes of dense source environments.

6+3 pages, 2+1 figures, version to appear in PRL, with expanded Supplementary Material

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