High-energy neutrinos from radio galaxies
  The IceCube experiment has recently reported the first observation of high-energy cosmic neutrinos. Their origin is still unknown. In this paper, we investigate the possibility that they originate in active galaxies. We show that hadronic interactions (pp) in the generally less powerful, more frequent, FR-I radio galaxies are one of the candidate source classes being able to accommodate the observation while the more powerful, less frequent, class of FR-II radio galaxies has too low of a column depths to explain the signal. 
J. Becker Tjus, B. Eichmann, F. Halzen, A. Kheirandish, S.M. Saba
astro-ph.HE