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CRA Seminar: Hans Niederhausen
December 1, 2022 @ 3:30 pm - 4:30 pm
Title: Neutrino astronomy with IceCube Connecting Photoelectrons to Supermassive Black Holes
Abstract: The IceCube Neutrino Observatory, deployed beneath the South Pole, is the largest optical neutrino telescope in the World. IceCube has been studying a diffuse flux of high-energy (>TeV) astrophysical neutrinos, ever since it reported the first evidence in 2013. However, the sources of the vast majority of these neutrinos, likely of extragalactic origin, remain elusive. Recent results, including evidence for neutrino emission from the nearby active galaxy NGC 1068, point to neutrino production in processes related to active galactic nuclei (AGN) powered by supermassive black holes at their centers. I will explain the crucial role of high-energy neutrinos as astrophysical messengers, the detection of neutrinos in IceCube, and recent progress in our searches for their sources. I will then discuss IceCube’s latest NGC 1068 result and what clues it gives us about the origin of the extragalactic neutrino flux.