Astrophysical neutrinos was discovered by IceCube experiment in 2013. More then 100 of such neutrinos was detected by IceCube in last years in several detection channels including all flavours of electron, muon and tau neutrinos. Fast construction of GVD detector in lake Baikal give hope to make first detection of astrophysical neutrinos in the North hemisphere already 2019-2020.
In this talk I’ll review theoretical models which attempt to describe neutrino data. I’ll argue that only combined analysis of neutrino, gamma-ray and cosmic ray data can allow to study origin of astrophysical neutrinos. Finally, I’ll show that present data can be described with two components, which have galactic and extragalactic origin and present several models for each of those components.