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@INPROCEEDINGS{Palladino:436456,
      author       = {Palladino, Andrea},
      title        = {{O}n the sources of high energy neutrinos},
      journal      = {Proceedings of Science / International School for Advanced
                      Studies},
      volume       = {357},
      issn         = {1824-8039},
      address      = {Trieste},
      publisher    = {SISSA},
      reportid     = {PUBDB-2020-00933},
      pages        = {058},
      year         = {2019},
      comment      = {Proceedings of The New Era of Multi-Messenger Astrophysics
                      — PoS(Asterics2019) - Sissa Medialab Trieste, Italy, 2019.
                      - ISBN - doi:10.22323/1.357.0058},
      booktitle     = {Proceedings of The New Era of
                       Multi-Messenger Astrophysics —
                       PoS(Asterics2019) - Sissa Medialab
                       Trieste, Italy, 2019. - ISBN -
                       doi:10.22323/1.357.0058},
      abstract     = {The discovery of a diffuse flux of high energy neutrinos
                      has opened a new era in the field of neutrino astronomy. Up
                      to now only one high energy neutrino has an identified
                      astrophysical counterpart, the blazar TXS 0506+056. However
                      the origin of the diffuse neutrino flux remains still a
                      mystery, even if many possible explanations have been
                      proposed in the last few years. The most natural hypothesis
                      was that high energy neutrinos are produced by blazars,
                      since these powerful objects dominate the γ-ray sky above
                      100 TeV. However the IceCube stacking limit shows that
                      resolved blazars cannot contribute more than $20\\%.$ Other
                      natural sources are the ones rich of gas, in which the
                      proton-proton interaction dominates. In this scenario an
                      issue would be the over-production of γ-rays associated to
                      neutrinos, if the neutrino spectrum were too soft. In this
                      work we summarize the present knowledge and we discuss the
                      role of low luminosity BL Lacs, showing that it is still
                      possible to power the sub-PeV neutrino flux with blazars.
                      Moreover we also discuss the role of pp sources, showing
                      that they are still into the game and they can saturate the
                      sub-PeV neutrino emission, giving also a contribution larger
                      than $50\\%$ in the energy range between 10 TeV and 100
                      TeV.},
      month         = {Mar},
      date          = {2019-03-25},
      organization  = {The New Era of Multi-Messenger
                       Astrophysics, Groningen (The
                       Netherlands), 25 Mar 2019 - 29 Mar
                       2019},
      cin          = {$Z_THAT$},
      ddc          = {530},
      cid          = {$I:(DE-H253)Z_THAT-20210408$},
      pnm          = {613 - Matter and Radiation from the Universe (POF3-613) /
                      NEUCOS - Neutrinos and the origin of the cosmic rays
                      (646623) / AUGER2FUTURE - Towards a New Giant Detector for
                      Ultra High Energy Cosmic Rays (328826) / EPLANET - European
                      Particle physics Latin American NETwork (246806) / ASTERICS
                      - Astronomy ESFRI and Research Infrastructure Cluster
                      (653477) / ULTRAS - Ultra-luminous supernovae :
                      understanding their nature and cosmic evolution (291222) /
                      SPCND - Supernovae: Physics and Cosmology in the Next Decade
                      (615929) / imbh - Do intermediate-mass black holes exist?
                      (647208) / Fireworks - Celestial fireworks: revealing the
                      physics of the time-variable sky (725161) / GLORIA - GLObal
                      Robotic telescopes Intelligent Array for e-Science (283783)},
      pid          = {G:(DE-HGF)POF3-613 / G:(EU-Grant)646623 /
                      G:(EU-Grant)328826 / G:(EU-Grant)246806 / G:(EU-Grant)653477
                      / G:(EU-Grant)291222 / G:(EU-Grant)615929 /
                      G:(EU-Grant)647208 / G:(EU-Grant)725161 /
                      G:(EU-Grant)283783},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)16 / PUB:(DE-HGF)8 / PUB:(DE-HGF)7},
      doi          = {10.22323/1.357.0058},
      url          = {https://bib-pubdb1.desy.de/record/436456},
}