Speaker
Description
The IceCube Neutrino Observatory is a cubic kilometer detector instrumented in the ice at the South Pole and has been operating for over a decade. In 2013, IceCube first announced the detection of an astrophysical flux of neutrinos, but the source of most of those neutrinos remains unknown. Since then, IceCube has performed a number of searches for neutrinos from astrophysical sources. IceCube sends high-energy, high-signalness alert events in real time to the astrophysical community, which led to the observation of a multimessenger flare from the blazar TXS 0506+056 in 2017. In addition, follow-up of transients has led to constraints on neutrino emission, including for the case of the brightest of all time GRB 221009A. Time-integrated analyses of Seyfert galaxies, including NGC 1068, has transformed our understanding of their high energy emission. This talk will focus on how neutrino observations by IceCube have been the key to understanding the physical mechanisms occurring in these astrophysical sources.