Constraints on the origin of the UHECR dipole anisotropy outside the Galaxy

0548553 - FZÚ 2022 RIV IT eng C - Conference Paper (international conference)
Bakalová, Alena - Trávníček, Petr - Vícha, Jakub
Constraints on the origin of the UHECR dipole anisotropy outside the Galaxy.
PoS - Proceedings of Science. Vol. 390. Trieste: Sissa Medilab srl, 2021, č. článku 618. ISSN 1824-8039.
[40th International Conference on High Energy physics (ICHEP2020). virtual meeting (CZ), 28.07.2020-06.08.2020]
R&D Projects: GA MŠMT LTT18004; GA MŠMT EF16_013/0001402
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 : Galactic magnetic field * ultra-high energy cosmic rays * anisotropy
OECD category: Particles and field physics
https://pos.sissa.it/390/618/pdf

The dipole anisotropy of ultra-high energy cosmic rays above 8 EeV detected by the Pierre Auger Observatory indicates an extragalactic origin of these particles. However, these particles travel long time until they reach the Earth and they are deflected by magnetic fields they cross during their propagation. Therefore, the amplitude and direction of the observed dipole on Earth necessarily does not need to correspond to the anisotropy of the flux when it enters our Galaxy. We present an analysis of influence of the Galactic magnetic field on arrival directions of cosmic rays using numerical simulations within the CRpropa3 package. Jansson-Farrar model of the Galactic magnetic field is used to propagate particles inside the Galaxy. We investigate possible directions and amplitudes of the dipole outside the Galaxy for different mass composition scenarios so that the final direction and amplitude on Earth is compatible with the measured dipole.

Permanent Link: http://hdl.handle.net/11104/0324599