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Observation of a Large-scale Anisotropy in the Arrival Directions of Cosmic Rays above \(8 \times 10^{18}\) eV

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      Abstract

      Cosmic rays are atomic nuclei arriving from outer space that reach the highest energies observed in nature. Clues to their origin come from studying the distribution of their arrival directions. Using \(3 \times 10^4\) cosmic rays above \(8 \times 10^{18}\) electron volts, recorded with the Pierre Auger Observatory from a total exposure of 76,800 square kilometers steradian year, we report an anisotropy in the arrival directions. The anisotropy, detected at more than the 5.2\(\sigma\) level of significance, can be described by a dipole with an amplitude of \(6.5_{-0.9}^{+1.3}\)% towards right ascension \(\alpha_{d} = 100 \pm 10\) degrees and declination \(\delta_{d} = -24_{-13}^{+12}\) degrees. That direction indicates an extragalactic origin for these ultra-high energy particles.

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      Most cited references 31

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      Evidence for a Primary Cosmic-Ray Particle with Energy1020eV

       John Linsley (1963)
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        An Apparent Effect of Galactic Rotation on the Intensity of Cosmic Rays

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          Cosmological Magnetic Fields: Their Generation, Evolution and Observation

           R Durrer,  A Neronov (2013)
          We review the possible mechanisms for the generation of cosmological magnetic fields, discuss their evolution in an expanding Universe filled with the cosmic plasma and provide a critical review of the literature on the subject. We put special emphasis on the prospects for observational tests of the proposed cosmological magnetogenesis scenarios using radio and gamma-ray astronomy and ultra high energy cosmic rays. We argue that primordial magnetic fields are observationally testable. They lead to magnetic fields in the intergalactic medium with magnetic field strength and correlation length in a well defined range. We also state the unsolved questions in this fascinating open problem of cosmology and propose future observations to address them.
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            Author and article information

            Journal
            21 September 2017
            1709.07321
            10.1126/science.aan4338

            http://creativecommons.org/licenses/by-sa/4.0/

            Custom metadata
            FERMILAB-PUB-17-354
            Science 357 (22 September 2017) 1266
            19 pages (with supplementary material), 8 figures
            astro-ph.HE

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