@article{763191f91559440ca09c7ac4722b7942,
title = "Observation of a large-scale anisotropy in the arrival directions of cosmic rays above 8 × 1018 eV",
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 × 104 cosmic rays with energies above 8 × 1018 electron volts, recorded with the Pierre Auger Observatory from a total exposure of 76,800 km2 sr year, we determined the existence of anisotropy in arrival directions. The anisotropy, detected at more than a 5.2σ level of significance, can be described by a dipole with an amplitude of 6.5+1.3 -0.9 percent toward right ascension αd = 100 ± 10 degrees and declination δd = -24+12 -13 degrees. That direction indicates an extragalactic origin for these ultrahighenergy particles.",
author = "{Pierre Auger Collaboration} and A. Aab and P. Abreu and M. Aglietta and Samarai, {I. Al} and Albuquerque, {I. F.M.} and I. Allekotte and A. Almela and Castillo, {J. Alvarez} and J. Alvarez-Mu{\~n}iz and Anastasi, {G. A.} and L. Anchordoqui and B. Andrada and S. Andringa and C. Aramo and F. Arqueros and N. Arsene and H. Asorey and P. Assis and J. Aublin and G. Avila and Badescu, {A. M.} and A. Balaceanu and F. Barbato and Luz, {R. J.Barreira} and Beatty, {J. J.} and Becker, {K. H.} and Bellido, {J. A.} and C. Berat and Bertaina, {M. E.} and X. Bertou and Biermann, {P. L.} and P. Billoir and J. Biteau and Blaess, {S. G.} and A. Blanco and J. Blazek and C. Bleve and M. Boh{\'a}cov{\'a} and D. Boncioli and C. Bonifazi and N. Borodai and Botti, {A. M.} and J. Brack and I. Brancus and T. Bretz and A. Bridgeman and Briechle, {F. L.} and P. Buchholz and A. Bueno and R. Pelayo",
year = "2017",
month = sep,
day = "22",
doi = "10.1126/science.aan4338",
language = "Ingl{\'e}s",
volume = "357",
pages = "1266--1270",
journal = "Science",
issn = "0036-8075",
number = "6357",
}