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Abstract: Astrophysical neutrinos can be produced in proton interactions of chargedcosmic rays with ambient photon or baryonic fields. Cosmic rays are observed inballoon, satellite and air shower experiments every day, from below 1e9 eV upto macroscopic energies of 1e21 eV. The observation of different photon fieldshas been done ever since, today with detections ranging from radio wavelengthsup to very high-energy photons in the TeV range. The leading question forneutrino astronomers is now which sources provide a combination of efficientproton acceleration with sufficiently high photon fields or baryonic targets atthe same time in order to produce a neutrino flux that is high enough to exceedthe background of atmospheric neutrinos. There are only two confirmedastrophysical neutrino sources up to today: the sun and SuperNova 1987A emitand emitted neutrinos at MeV energies. The aim of large underground Cherenkovtelescopes like IceCube and KM3NeT is the detection of neutrinos at energiesabove 100 GeV. In this paper, recent developments of neutrino flux modeling forthe most promising extragalactic sources, gamma ray bursts and active galacticnuclei, are presented.

Autor: Julia K. Becker



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