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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