Speaker
Description
IceCube is the current largest neutrino observatory with an instrumented detection volume of 1 km³ in the ice-sheet below the antarctic South Pole station. With a 4π field of view and an uptime of >99% it is constantly monitoring the full sky to find astrophysical neutrinos. With the detection of an astrophysical neutrino flux in 2013, IceCube opened a new observation window to the non-thermal universe. On September 22, 2017 the IceCube online system sent out an alert reporting on a high-energy neutrino event which is spatially and timely correlated at the 3σ level with a high-energy gamma-ray flare of the blazar TXS 0506+056. Multi-wavelength follow-up observation by several observatories revealed a coincident flare in very-high-energy gamma-rays. In addition, IceCube found an independent 3.5 σ excess of a time-variable neutrino flux in the direction of TXS 0506+056 in 9.5 years of previous data. These finding mark the first evidence for a multi-messenger observation of an astrophysical source, including neutrino emission. In this talk I will present the latest astrophysical IceCube results, focusing on the multi-messenger program of IceCube.
