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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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              Depth of maximum of air-shower profiles at the Pierre Auger Observatory. II. Composition implications

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                Author and article information

                Journal
                21 September 2017
                Article
                10.1126/science.aan4338
                1709.07321

                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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