This thesis presents several multi-messenger analyses, searching for the long-sough sources of high-energy cosmic radiation. By combining data from the IceCube Neutrino Detector and other multi-frequency observatories, the first two significant neutrino point sources - the blazar TXS 0506+056 and the Seyfert 2 galaxy NGC 1068 - are identified. Furthermore, a correlation study of high-energy neutrinos with gamma-ray blazars finds 3.2σ evidence for an astrophysical neutrino flux contribution from IBL/HBL blazars. Finally, we present a deep neural network that helps to optimize IceCube’s event selection pipeline.
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This thesis presents several multi-messenger analyses, searching for the long-sough sources of high-energy cosmic radiation. By combining data from the IceCube Neutrino Detector and other multi-frequency observatories, the first two significant neutrino point sources - the blazar TXS 0506+056 and the Seyfert 2 galaxy NGC 1068 - are identified. Furthermore, a correlation study of high-energy neutrinos with gamma-ray blazars finds 3.2σ evidence for an astrophysical neutrino flux contribution from...
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