Department of Physics
Research, teaching and outreach in Physics at UW–Madison

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Multi-messenger astronomy with high-energy neutrinos
Date: Tuesday, February 15th
Time: 2:00 pm
Place: Join Zoom Meeting Meeting ID: 912 3071 4547
Speaker: Anna Franckowiak , DESY/Ruhr University Bochum
Abstract: Cosmic rays are charged particles (mainly protons) that bombard the Earth from all directions reaching energies up to 10 million times what can be achieved by the most powerful man-made accelerator, the LHC. Their origin is difficult to trace, because cosmic rays are deflected by magnetic fields on their journey from their source to Earth. However, cosmic rays produce gamma-ray photons and neutrinos in interactions with matter and photon fields in or close to their source. Being neutral those secondary particles can travel undeflected and ultimately point back to the source. While gamma rays are not solely produced in interactions of cosmic ray protons, neutrinos provide a smoking-gun signature for acceleration of protons (or heavier nuclei).

A diffuse flux of cosmic neutrinos was first discovered by the cubic-kilometer-sized IceCube detector located at the South Pole in 2013. I will present the ongoing search for the origin of those neutrinos using multi-messenger studies and discuss promising candidate sources with a focus on the new promising neutrino source class of tidal disruption events.

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Meeting ID: 912 3071 4547
Host: Baha Balantekin
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