Revisiting the distance to the nearest ultrahigh energy cosmic ray source: Effects of extragalactic magnetic fields

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We update the constraints on the location of the nearest ultrahigh energy cosmic ray (UHECR) source. By analyzing recent data from the Pierre Auger Observatory using state-of-the-art CR propagation models, we reaffirm the need of local sources with a distance less than 25-100 Mpc, depending on mass composition. A new fast semianalytical method for the propagation of UHECR in environments with turbulent magnetic fields is developed. The onset of an enhancement and a low-energy magnetic horizon of cosmic rays from sources located within a particular distance range is demonstrated. We investigate the distance to the nearest source, taking into account these magnetic field effects. The results obtained highlight the robustness of our constrained distances to the nearest source.

Original languageEnglish
Article number063012
JournalPhysical Review D
Issue number6
Number of pages11
Publication statusPublished - 11 Sep 2020

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