Dr. Anatoli Fedynitch (ICRR)
"Multi-messenger signatures of high-energy neutrino and ultra-high energy cosmic ray sources"
Intensive searches for the sources of astrophysical high- energy neutrinos in the past decade revealed only one source candidate - the blazar TXS0506+056 (TXS). This first evidence was triggered by a real-time alert from the IceCube Neutrino Observatory that has been followed up by numerous "electromagnetic" observations. The available multiwavelength spectrum of TXS allowed us to constrain a remarkable number of possible source scenarios with only one observed neutrino. Although, a preceding neutrino burst from the same source was found in IceCube's archival the data, the absence of simultaneous multi- wavelength observations leaves numerous open questions and is significantly less restrictive. The identification of neutrino sources and their "hadronic signatures" in the electromagnetic spectrum will open a new window to the fundamental neutrino properties at extremely long base lines.