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- W2016034250 abstract "We simulate propagation of cosmic ray nucleons above ${10}^{19}$ eV in scenarios where both the source distribution and magnetic fields within about 50 Mpc from us are obtained from an unconstrained large scale structure simulation. We find that a consistency of predicted sky distributions with current data above $4ifmmodetimeselsetexttimesfi{}{10}^{19}$ eV requires magnetic fields of $ensuremath{simeq}0.1ensuremath{mu}mathrm{G}$ in our immediate environment, and a nearby source density of $ensuremath{sim}{10}^{ensuremath{-}4}ensuremath{-}{10}^{ensuremath{-}3}{mathrm{Mpc}}^{ensuremath{-}3}.$ Radio galaxies could provide the required sources, but only if both high- and low-luminosity radio galaxies are very efficient cosmic ray accelerators. Moreover, at $ensuremath{simeq}{10}^{19}$ eV an additional isotropic flux component, presumably of cosmological origin, should dominate over the local flux component by about a factor of 3 in order to explain the observed isotropy. This argues against the scenario in which local astrophysical sources of cosmic rays above $ensuremath{simeq}{10}^{19}$ eV reside in a strongly magnetized $(Bensuremath{simeq}0.1ensuremath{mu}mathrm{G})$ and structured intergalactic medium. Finally we discuss how future large scale full-sky detectors such as the Pierre Auger project will allow us to put much more stringent constraints on source and magnetic field distributions." @default.
- W2016034250 created "2016-06-24" @default.
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- W2016034250 date "2003-08-12" @default.
- W2016034250 modified "2023-09-25" @default.
- W2016034250 title "Ultrahigh energy cosmic rays in a structured and magnetized universe" @default.
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- W2016034250 doi "https://doi.org/10.1103/physrevd.68.043002" @default.
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