PeV neutrinos from intergalactic interactions of cosmic rays emitted by active galactic nuclei.

@article{Kalashev2013PeVNF,
  title={PeV neutrinos from intergalactic interactions of cosmic rays emitted by active galactic nuclei.},
  author={O E Kalashev and Alexander Kusenko and Warren Essey},
  journal={Physical review letters},
  year={2013},
  volume={111 4},
  pages={
          041103
        }
}
The observed very high energy spectra of distant blazars are well described by secondary gamma rays produced in line-of-sight interactions of cosmic rays with background photons. In the absence of the cosmic-ray contribution, one would not expect to observe very hard spectra from distant sources, but the cosmic ray interactions generate very high energy gamma rays relatively close to the observer, and they are not attenuated significantly. The same interactions of cosmic rays are expected to… 

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