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Update on the searches for anisotropies in UHECR arrival directions with the Pierre Auger Observatory and the Telescope Array
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SYSNO ASEP 0617849 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Update on the searches for anisotropies in UHECR arrival directions with the Pierre Auger Observatory and the Telescope Array Author(s) Caccianiga, L. (AR)
Anchordoqui, L. (US)
Bianciotto, M. (IT)
Urban, Federico (FZU-D) ORCID
Abdul Halim, A. (AU)
Abreu, P. (PT)
Bakalová, Alena (FZU-D) ORCID
Blažek, Jiří (FZU-D) ORCID, RID
Boháčová, Martina (FZU-D) RID, ORCID
Chudoba, Jiří (FZU-D) RID, ORCID
Denner, Nikolas (FZU-D) ORCID
Ebr, Jan (FZU-D) RID, ORCID
Hamal, Petr (FZU-D) ORCID
Janeček, Petr (FZU-D) RID, ORCID
Jílek, Vlastimil (FZU-D)
Juryšek, Jakub (FZU-D) ORCID
Majerčáková, Margita (FZU-D) ORCID
Mandát, Dušan (FZU-D) RID, ORCID
Müller, Ana Laura (FZU-D)
Negi, Shefali (FZU-D)
Palatka, Miroslav (FZU-D) RID, ORCID, SAI
Panja, Shayoni (FZU-D)
Pech, Miroslav (FZU-D) RID, ORCID
Prouza, Michael (FZU-D) RID, ORCID
Řídký, Jan (FZU-D) RID, ORCID
dos Santos, Eva M. Martins (FZU-D) ORCID
Schovánek, Petr (FZU-D) RID, ORCID
Stadelmaier, Maximilian Klaus (FZU-D) ORCID
Svozilíková, Zuzana (FZU-D) ORCID
Tobiška, Petr (FZU-D) ORCID
Trávníček, Petr (FZU-D) RID, ORCID
Vícha, Jakub (FZU-D) RID, ORCID
Yushkov, Alexey (FZU-D) ORCIDNumber of authors 300 Article number 521 Source Title Proceedings of Science, 444. - Trieste : Sissa Medilab srl, 2024 / Saito T. - ISSN 1824-8039 Number of pages 15 s. Publication form Online - E Action International Cosmic Ray Conference ICRC2023 /38./ Event date 26.07.2023 - 03.08.2023 VEvent location Nagoya Country JP - Japan Event type WRD Language eng - English Country IT - Italy Keywords UHECR Subject RIV BF - Elementary Particles and High Energy Physics OECD category Astronomy (including astrophysics,space science) R&D Projects LM2023032 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LM2015038 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LTT18004 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) LM2018102 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) EF16_013/0001402 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) EF18_046/0016010 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support FZU-D - RVO:68378271 DOI https://doi.org/10.22323/1.444.0521 Annotation 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. Workplace Institute of Physics Contact Kristina Potocká, potocka@fzu.cz, Tel.: 220 318 579 Year of Publishing 2025 Electronic address https://pos.sissa.it/444/521/pdf
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