0617849 - FZÚ 2025 RIV IT eng C - Konferenční příspěvek (zahraniční konf.)
Caccianiga, L. - Anchordoqui, L. - Bianciotto, M. - Urban, Federico R. - Abdul Halim, A. - Abreu, P. - Bakalová, Alena - Blažek, Jiří - Boháčová, Martina - Chudoba, Jiří - Denner, Nikolas - Ebr, Jan - Hamal, Petr - Janeček, Petr - Jílek, Vlastimil - Juryšek, Jakub - Majerčáková, Margita - Mandát, Dušan - Müller, Ana Laura - Negi, Shefali - Palatka, Miroslav - Panja, Shayoni - Pech, Miroslav - Prouza, Michael - Řídký, Jan - dos Santos, Eva M. Martins - Schovánek, Petr - Stadelmaier, Maximilian Klaus - Svozilíková, Zuzana - Tobiška, Petr - Trávníček, Petr - Vícha, Jakub - Yushkov, Alexey … celkem 300 autorů
Update on the searches for anisotropies in UHECR arrival directions with the Pierre Auger Observatory and the Telescope Array.
Proceedings of Science. Vol. 444. Trieste: Sissa Medilab srl, 2024 - (Saito, T.), č. článku 521. ISSN 1824-8039.
[International Cosmic Ray Conference ICRC2023 /38./. Nagoya (JP), 26.07.2023-03.08.2023]
Grant CEP: GA MŠMT LM2023032; GA MŠMT LM2015038; GA MŠMT LTT18004; GA MŠMT(CZ) LM2018102; GA MŠMT EF16_013/0001402; GA MŠMT(CZ) EF18_046/0016010
Institucionální podpora: RVO:68378271
Klíčová slova: UHECR
Obor OECD: Astronomy (including astrophysics,space science)
Web výsledku:
https://pos.sissa.it/444/521/pdf
DOI: https://doi.org/10.22323/1.444.0521

The origin of ultra-high-energy cosmic rays (UHECRs), particles from outer space with energies~E≥1EeV, is still unknown, though the near-isotropy of their arrival direction distribution excludes a dominant Galactic contribution, and interactions with background photons prevent them from travelling cosmologically large distances. This suggests that their sources must be searched for in nearby galaxy groups and clusters. Deflections by intergalactic and Galactic magnetic fields are expected to hinder such searches but not preclude them altogether. So far, the only anisotropy detected with statistical significance ≥5σ is a modulation in right ascension in the data from the Pierre Auger Observatory at~E≥8EeV interpretable as a 7% dipole moment. Various hints for higher-energy, smaller-scale anisotropies have been reported. UHECR arrival direction data from both the Pierre Auger Observatory and the Telescope Array experiment have been searched for anisotropies by a working group with members from both collaborations, combining the two datasets requires a cross-calibration procedure due to the different systematic uncertainties on energy measurements but allows us to perform analyses that are less model-dependent than what can be done with partial sky coverage. We report a significant dipole pointing away from the Galactic Center and a ∼4.6σ anisotropy found when comparing the directions of UHECRs with a catalog of starburst galaxies.
Trvalý link: https://hdl.handle.net/11104/0364699