Séminaire Hautes Energies / |
| « Hunting the origin of ultrahigh-energy cosmic rays through neutrinos and gamma-rays » |
|
Saikat Das |
|
Ultrahigh-energy cosmic rays (UHECRs) are the highest-energy particles observed in the Universe, with their energy spectrum extending beyond a few times 1e20 eV. Their unknown sources can also contribute to the diffuse astrophysical neutrino flux measured by IceCube in the TeV-PeV energy range. By modeling their multi-wavelength energy spectrum, we probe cosmic ray acceleration in high-energy gamma-ray sources such as active galactic nuclei and gamma-ray bursts. In particular, I will discuss models explaining the correlation of a high-energy neutrino event from the direction of the Fermi-LAT gamma-ray blazar TXS 0506+056 and the >10 TeV afterglow emission in GRB 221009A. I will also present the PeV-EeV diffuse neutrino flux from the entire blazar population using a luminosity-dependent density evolution. For a generic source distribution, the detection of cosmogenic neutrinos beyond ~0.1 EeV is favorable by upcoming detectors, such as IceCube Gen-2, GRAND, and POEMMA, depending on the UHECR mass composition.
|
|
mercredi 11 octobre 2023 - 14:00 Salle 281 Institut d'Astrophysique de Paris |
| Pages web du séminaire / Seminar's webpage |