Sources of astrophysical neutrinos

IceCube neutrino telescope recently discovered astrophysical neutrinos in the energy range from 10 TeV to 10 PeV. This discovery challenged existed theoretical models due to unexpected observation of soft 1/E^{2.5} neutrino spectrum for cascade data and at the same time $1/E^{2.1}$ spectrum for muon neutrinos. Together with limits from diffuse gamma-ray flux measured with Fermi LAT this excluded most of existed theoretical predictions. In my talk I'll review theoretical models, which can explain observed data both with Galactic and extra-galactic sources of neutrinos.