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

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(Sep 2, 2015)

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 astrophysical sources of the TeV-PeV neutrinos are transparent to gamma rays with respect to two-photon annihilation, a large fraction of the isotropic diffuse gamma-ray background should originate from hadronic emission of such sources, independently of the production mechanism. Strong tensions with the diffuse gamma-ray data are unavoidable especially in hadronuclear scenarios. We further show that, if the IceCube neutrinos have a photohadronic 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 may indicate a population of CR accelerators hidden in GeV-TeV gamma rays. 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.

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