Constraints on the origin of the UHECR dipole anisotropy outside the Galaxy
January 24, 2021
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.
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