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Comptes Rendus Physique
Volume 15, n° 4
pages 309-317 (avril 2014)
Doi : 10.1016/j.crhy.2014.02.014
Ultra-high-energy cosmic neutrinos: at   energies and above
Neutrinos cosmiques d'ultra haute énergie :   et au-delà

Shigeru Yoshida
 Department of Physics, Graduate School of Science, Chiba University, Chiba 263-8522, Japan 


The high-energy neutrino astronomy has finally bloomed. The discovery of the first   (PeV or  ) neutrino events by the IceCube Collaboration followed by the dedicated search for   events exhibited the evidence of an astrophysical neutrino flux. The estimated flux level is around  , consistent with the intensity expected from the energetics of extragalactic cosmic rays. The strong bound of neutrino flux in the   range, which amounts to   at   provided by IceCube has reached the flux region predicted for some ultra-high-energy cosmic-ray source class candidates, leading to astrophysically meaningful constraints on the origin of cosmic rays. It disfavors strong cosmological evolution of the highest energy cosmic ray sources such as the Fanaroff–Riley type-II class of radio Galaxies. We live in an era when neutrinos provide clues to resolve long-standing mystery of ultra-high-energy cosmic rays.

The full text of this article is available in PDF format.

L'astronomie neutrino est enfin ouverte. La découverte des premiers événements neutrino de   (PeV ou  ) par la collaboration IceCube suivie d'une recherche fructueuse d'événements dans la gamme des   a démontré l'existence d'un flux de neutrinos astrophysiques. Le flux est estimé à environ  , en accord avec l'intensité déduite du bilan énergétique des rayons cosmiques extragalactiques. Au-dessus de  , la limite sévère obtenue par IceCube,   à  , a atteint la région de flux prédite pour certaines classes de sources de rayons cosmiques d'ultra-haute énergie, fournissant ainsi des limites contraignantes du point de vue astrophysique sur l'origine des rayons cosmiques. Cette limite défavorise une forte évolution cosmologique de sources telles que celle des radio-galaxies Fanaroff–Riley de type II. Nous entrons dans l'ère où les neutrinos fournissent des indices pour résoudre le sempiternel mystère des rayons cosmiques.

The full text of this article is available in PDF format.

Keywords : Cosmic rays, Neutrino, Ultra high energy, Cosmic ray sources

Mots-clés : Rayons cosmiques, Neutrino, Ultra-haute énergie, Sources des rayons cosmiques

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