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IceCube has measured a diffuse astrophysical flux of TeV-PeV neutrinos. Themost plausible sources are unique high energy cosmic ray accelerators likehypernova remnants (HNRs) and remnants from gamma ray bursts in star-burstgalaxies, which can produce primary cosmic rays with the required energies andabundance. In this case, however, ordinary supernova remnants (SNRs), which arefar more abundant than HNRs, produce a comparable or larger neutrino flux inthe ranges up to 100-150 TeV energies, implying a spectral break in the IceCubesignal around these energies. The SNRs contribution in the diffuse flux up tothese hundred TeV energies provides a natural baseline and then constrains theexpected PeV flux.

Diffuse neutrinos from extragalactic supernova remnants: Dominating the 100 TeV IceCube flux