Arrival directions of cosmic rays above 32 EeV from phase one of the Pierre Auger Observatory

0562633 - FZÚ 2023 RIV GB eng J - Journal Article
Abreu, A. - Aglietta, M. - Albury, J.M. - Bakalová, Alena - Blažek, Jiří - Boháčová, Martina - Chudoba, Jiří - Ebr, Jan - Hamal, Petr - Janeček, Petr - Juryšek, Jakub - Mandát, Dušan - Müller, Ana Laura - Palatka, Miroslav - Pech, Miroslav - Prouza, Michael - Řídký, Jan - dos Santos, Eva M. Martins - Schovánek, Petr - Stadelmaier, Maximilian Klaus - Tobiška, Petr - Trávníček, Petr - Vícha, Jakub - Yushkov, Alexey
Arrival directions of cosmic rays above 32 EeV from phase one of the Pierre Auger Observatory.
Astrophysical Journal. Roč. 935, č. 2 (2022), č. článku 170. ISSN 0004-637X. E-ISSN 1538-4357
R&D Projects: GA MŠMT LM2015038; GA MŠMT LTT18004; GA MŠMT EF16_013/0001402; GA MŠMT(CZ) EF18_046/0016010
Grant - others:OP VVV - AUGER-CZ(XE) CZ.02.1.01/0.0/0.0/16_013/0001402
Research Infrastructure: AUGER-CZ II - 90102
Institutional support: RVO:68378271
Keywords : Pierre Auger Observatory * cosmic rays * highest energies
OECD category: Particles and field physics
Impact factor: 4.9, year: 2022
Method of publishing: Open access

A promising energy range to look for angular correlations between cosmic rays of extragalactic origin and their sources is at the highest energies, above a few tens of EeV (1 EeV equivalent to 10(18) eV). Despite the flux of these particles being extremely low, the area of similar to 3000 km(2) covered at the Pierre Auger Observatory, and the 17 yr data-taking period of the Phase 1 of its operations, have enabled us to measure the arrival directions of more than 2600 ultra-high-energy cosmic rays above 32 EeV. We publish this data set, the largest available at such energies from an integrated exposure of 122,000 km(2) sr yr, and search it for anisotropies over the 3.4 pi steradians covered with the Observatory. Evidence for a deviation in excess of isotropy at intermediate angular scales, with similar to 15 degrees Gaussian spread or similar to 25 degrees top-hat radius, is obtained at the 4 sigma significance level for cosmic-ray energies above similar to 40 EeV.
Permanent Link: https://hdl.handle.net/11104/0335826