Aachen 2019 – scientific programme

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T: Fachverband Teilchenphysik

T 24: Hauptvorträge II

T 24.2: Invited Talk

Tuesday, March 26, 2019, 11:45–12:30, H01

Neutrinos from Distant Galaxies — •Christopher Wiebusch — III. Physikalisches Insitut B, RWTH Aachen

Modern astronomy is seen in a multi-messenger context. Neutrinos, charged cosmic rays, and also gravitational waves supplement photons as additional messengers. The universe is transparent to neutrinos at all energies. They maintain their directional information and trace hadronic processes. Therefore since many decades, the observation of high-energy neutrinos has been considered of outstanding importance for the exploration of the high energy universe, e.g. for the search for the sources of cosmic rays. However, the observation of high-energy cosmic neutrinos is challenging because the small flux and small interaction cross section requires huge detection volumes. In 2013, the IceCube Neutrino Observatory reported the first observation of high-energy cosmic neutrinos. Being largely isotropic in their arrival directions, an extragalactic origin is likely but their sources remain unidentified to date. With the help of multi-wavelength photon observations, in 2018 neutrinos have been associated for the first time with a source, the Blazar TXS 0506+056. The talk reviews the detection of high-energy cosmic neutrinos, exciting recent observations and future developments.