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 × 10^4 cosmic rays with energies above 8 × 10^18 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 5.2s level of significance, can be described by a dipole with an amplitude of 6.5+1.3-0.9 percent toward right ascension a = 100 ± 10 degrees and declination dd = 24+12-13 degrees. That direction indicates an extra-galactic origin for these ultra-highenergy particles.
Observation of a large-scale anisotropy in the arrival directions of cosmic rays above 8 × 1018 eV / A. Aab, P. Abreu, M. Aglietta, I..A..L. Samarai, I..F..M. Albuquerque, I. Allekotte, A. Almela, J..A. Castillo, J. Alvarez Muniz, G..A. Anastasi, L. Anchordoqui, B. Andrada, S. Andringa, C. Aramo, F. Arqueros, N. Arsene, H. Asorey, P. Assis, J. Aublin, G. Avila, A..M. Badescu, A. Balaceanu, F. Barbato, R..J..B. Luz, J..J. Beatty, K..H. Becker, J..A. Bellido, C. Berat, M..E. Bertaina, X. Bertou, P..L. Biermann, P. Billoir, J. Biteau, S..G. Blaess, A. Blanco, J. Blazek, C. Bleve, M. Bohã¡covã¡, D. Boncioli, C. Bonifazi, N. Borodai, A..M. Botti, J. Brack, I. Brancus, T. Bretz, A. Bridgeman, F..L. Briechle, P. Buchholz, A. Bueno, S. Buitink, M. Buscemi, K..S. Caballero mora, L. Caccianiga, A. Cancio, F. Canfora, L. Caramete, R. Caruso, A. Castellina, G. Cataldi, L. Cazon, A..G. Chavez, J..A. Chinellato, J. Chudoba, R..W. Clay, A. Cobos, R. Colalillo, A. Coleman, L. Collica, M..R. 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Observation of a large-scale anisotropy in the arrival directions of cosmic rays above 8 × 1018 eV
L. Caccianiga;L. Collica;M.G. Giammarchi;M. Mallamaci;L. Miramonti;
2017
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 × 10^4 cosmic rays with energies above 8 × 10^18 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 5.2s level of significance, can be described by a dipole with an amplitude of 6.5+1.3-0.9 percent toward right ascension a = 100 ± 10 degrees and declination dd = 24+12-13 degrees. That direction indicates an extra-galactic origin for these ultra-highenergy particles.File | Dimensione | Formato | |
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