Large-scale cosmic-ray anisotropies above 4 EeV measured by the Pierre Auger observatory

0499841 - FZÚ 2019 RIV US eng J - Článek v odborném periodiku
Aab, A. - Abreu, A. - Aglietta, M. - Blažek, Jiří - Boháčová, Martina - Chudoba, Jiří - Ebr, Jan - Juryšek, Jakub - Mandát, Dušan - Palatka, Miroslav - Pech, Miroslav - Prouza, Michael - Řídký, Jan - dos Santos, Eva M. Martins - Schovánek, Petr - Trávníček, Petr - Vícha, Jakub - Yushkov, Alexey … celkem 376 autorů
Large-scale cosmic-ray anisotropies above 4 EeV measured by the Pierre Auger observatory.
Astrophysical Journal. Roč. 868, č. 1 (2018), s. 1-12, č. článku 4. ISSN 0004-637X. E-ISSN 1538-4357
Grant CEP: GA MŠMT LG15014; GA MŠMT EF16_013/0001402
Grant ostatní: OP VVV - AUGER-CZ(XE) CZ.02.1.01/0.0/0.0/16_013/0001402
Výzkumná infrastruktura: AUGER-CZ - 90038
Institucionální podpora: RVO:68378271
Klíčová slova: astroparticle physics * cosmic rays
Obor OECD: Particles and field physics
Impakt faktor: 5.580, rok: 2018
Způsob publikování: Omezený přístup
https://doi.org/10.3847/1538-4357/aae689

We present a detailed study of the large-scale anisotropies of cosmic rays with energies above 4 EeV measured using the Pierre Auger Observatory. For the energy bins [4, 8] EeV and E >= 8 EeV, the most significant signal is a dipolar modulation in R.A. at energies above 8 EeV, as previously reported. In this paper we further scrutinize the highest-energy bin by splitting it into three energy ranges. We find that the amplitude of the dipole increases with energy above 4 EeV. The growth can be fitted with a power law with index beta = 0.79 +/- 0.19. The directions of the dipoles are consistent with an extragalactic origin of these anisotropies at all the energies considered. Additionally, we have estimated the quadrupolar components of the anisotropy: they are not statistically significant. We discuss the results in the context of the predictions from different models for the distribution of ultrahigh-energy sources and cosmic magnetic fields.

Trvalý link: http://hdl.handle.net/11104/0292087