Testing the hadronuclear origin of PeV neutrinos observed with IceCube

@article{Murase2013TestingTH,
  title={Testing the hadronuclear origin of PeV neutrinos observed with IceCube},
  author={Kohta Murase and Markus Ahlers and Brian C. Lacki},
  journal={Physical Review D},
  year={2013},
  volume={88},
  pages={121301}
}
We consider implications of the IceCube signal for hadronuclear (pp) scenarios of neutrino sources such as galaxy clusters/groups and star-forming galaxies. Since the observed neutrino flux is comparable to the diffuse γ-ray background flux obtained by Fermi, we place new, strong upper limits on the source spectral index, Γ≲2.1–2.2. In addition, the new IceCube data imply that these sources contribute at least 30%–40% of the diffuse γ-ray background in the 100 GeV range and even ∼100% for… 

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