Hidden Cosmic-Ray Accelerators as an Origin of TeV-PeV Cosmic Neutrinos
by
D. Guetta
→
Europe/Rome
Aula Conversi (Dipartimento di Fisica - Ed. G. Marconi)
Aula Conversi
Dipartimento di Fisica - Ed. G. Marconi
Description
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 -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 (pp) scenarios. We further show that, if the IceCube neutrinos have a photohadronic (p) 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 -ray counterparts are encouraged, and TeV-PeV neutrinos themselves will serve as special probes of dense source environments.
