Journal
SCIENCE
Volume 357, Issue 6357, Pages 1266-1270Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aan4338
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- Direct For Mathematical & Physical Scien
- Division Of Physics [1460394, 1506232] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Physics [1506486, 1212538] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1153335] Funding Source: National Science Foundation
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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 x 10(4) cosmic rays with energies above 8 x 10(18) electron volts, recorded with the Pierre Auger Observatory from a total exposure of 76,800 km(2) sr year, we determined the existence of anisotropy in arrival directions. The anisotropy, detected at more than a 5.2s level of significance, can be described by a dipole with an amplitude of 6:5(-0.9)(+1.3) percent toward right ascension alpha(d) = 100 +/- 10 degrees and declination delta(d) = -24(-13)(+12) degrees. That direction indicates an extragalactic origin for these ultrahighenergy particles.
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