11–15 Jul 2022
Niels Bohr Institute
Europe/Copenhagen timezone
Zoom room: https://ucph-ku.zoom.us/j/61850277164?pwd=bW9yN3ltTkFXOXRacjNBSUYvWHZYZz09

Deciphering Cosmic Neutrinos

11 Jul 2022, 14:00
12m
Auditorium A (NBI)

Auditorium A

NBI

Speaker

Kathrine Mørch Groth (Niels Bohr Institute, University of Copenhagen)

Description

High-energy neutrino astronomy is rapidly evolving: After the discovery of a largely diffuse astrophysical TeV-PeV neutrino flux, the IceCube Neutrino Observatory has more recently found indications of associations between blazar emission and high-energy neutrinos. However, different analyses show that blazars are only expected to make up a subdominant contribution to the total observed diffuse flux. We are thus in the remarkable situation that we have firmly detected a diffuse astrophysical neutrino flux but at the same time, we have so far no (well-established) neutrino point sources. Neutrinos are produced along with $\gamma$-rays in the interactions of Ultra High-Energy Cosmic Rays (UHECRs) and radiation and gas. But as with UHECRs, the sources of the high-energy neutrinos are as yet unknown. The close relations between the emission of the different messengers: cosmic rays, neutrinos and gamma-rays make it possible to study the neutrino flux with a multi-messenger approach. Our work investigates the viable source populations responsible for the high-energy largely diffuse neutrino flux that IceCube has observed. Using multi-messenger data, we seek to derive a set of necessary conditions on neutrino source candidates. Once we have the resulting candidate neutrino source populations, the aim is to test them in an IceCube data analysis.

Primary author

Kathrine Mørch Groth (Niels Bohr Institute, University of Copenhagen)

Presentation materials