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- W3120223812 abstract "Ultra-high-energy cosmic rays (UHECRs) are atomic nuclei from space with vastly higher energies than any other particles ever observed. Their origin and chemical composition remain a mystery. As we show here, the large- and intermediate-angular-scale anisotropies observed by the Pierre Auger Observatory are a powerful tool for understanding the origin of UHECRs. Without specifying any particular production mechanism, but only postulating that the source distribution follows the matter distribution of the local Universe, a good accounting of the magnitude, direction and energy dependence of the dipole anisotropy at energies above $8 times 10^{18}$ eV is obtained, after taking into account the impact of energy losses during propagation (the GZK horizon), diffusion in extragalactic magnetic field and deflections in the Galactic magnetic field (GMF). This is a major step toward the long-standing hope of using UHECR anisotropies to constrain UHECR composition and magnetic fields. The observed dipole anisotropy is incompatible with a pure proton composition in this scenario. With a more accurate treatment of energy losses, it should be possible to further constrain the cosmic-ray composition and properties of the extragalactic magnetic field, self-consistently improve the GMF model, and potentially expose individual UHECR sources." @default.
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- W3120223812 date "2021-05-01" @default.
- W3120223812 modified "2023-10-05" @default.
- W3120223812 title "The Imprint of Large-scale Structure on the Ultrahigh-energy Cosmic-Ray Sky" @default.
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- W3120223812 doi "https://doi.org/10.3847/2041-8213/abf11e" @default.
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