Astroparticle Colloquia

IceCube: Opening a New Window on the Universe from the South Pole

by Prof. Francis Halzen (Wisconsin IceCube Particle Astrophysics Center and the Department of Physics, University of Wisconsin–Madison)

Online (GSSI)

Online (GSSI)

Online (GSSI)

We will review the scientific motivation and the early R&D that eventually led the IceCube project to transform a cubic kilometer of natural Antarctic ice into a neutrino detector. The instrument detects more than 100,000 neutrinos per year in the GeV to 10 PeV energy range. Among those, we have isolated a flux of high-energy neutrinos of cosmic origin, with an energy density in the extreme universe similar to that of high-energy photons and cosmic rays. We identified their first source: on September 22, 2017, several astronomical telescopes pinpointed a flaring active galaxy, powered by a supermassive black hole, as the source of a cosmic neutrino with an energy of 290 TeV. We will review subsequent developments in neutrino multimessenger astronomy.

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