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Aglietta, M.; Allekotte, I.; Andrada, B.; Barbato, F.; Luz, R. J. Barreira; Bellido, J. A.; Bertaina, M. E.; Biermann, P. L.; Brack, J.; Briechle, F. L.; Buitink, S.; Buscemi, M.; Caballero-Mora, K. S.; Chytka, L.; Clay, R. W.; Colalillo, R.; Conceição, R.; Dawson, B. R.; Mauro, G. De; Neto, J. R. T. de Mello; Mitri, I. De; Debatin, J.; Deligny, O.; Dobrigkeit, C.; Anjos, R. C. dos; Dundovic, A.; Ebr, J.; Erdmann, M.; Etchegoyen, A.; Farrar, G.; Fauth, A. C.; Fazzini, N.; Figueira, J. M.; Gemmeke, H.; Gherghel-Lascu, A.; Giaccari, U.; Giller, M.; Golup, G.; González, N.; Goos, I.; Hampel, M. R.; Hansen, P.; Harvey, V. M.; Hebbeker, T.; Hojvat, C.; Jandt, I.; Kääpä, A.; Kampert, K. H.; Klages, H. O.; Kleifges, M.; Awad, A. Kuotb; Lago, B. L.; LaHurd, D.; Legumina, R.; Lorek, R.; Mari, I. C.; Martello, D.; Martinez, H.; Martínez Bravo, O.; Mitrica, B.; Mostafá, M.; Muller, M. A.; Nellen, L.; Nucita, A; Pallotta, J.; Pech, M.; Pelayo, R.; Perlin, M.; Perrone, L.; Pont, B.; Prado, R. R.; Ramos-Pollan, R.; Riehn, F.; Ristori, P.; de Carvalho, W. Rodrigues; Rovero, A. C.; Saftoiu, A.; Salamida, F.; Santos, E.; Savina, P.; Scherini, V.; Schieler, H.; Schimp, M.; Schmidt, D.; Schovánek, P.; Schröder, S.; Schumacher, J.; Silli, G.; Sima, O.; Stanca, D.; Stasielak, J.; Suarez, F.; Šupík, J.; Szadkowski, Z.; Elipe, G. Torralba; Varela, E.; Quispe, I. D. Vergara; Weber, M.; Wilczy ski, H.; Wirtz, M.
The Astrophysical journal, 11/2018, Letnik: 868, Številka: 1Journal Article
We present a detailed study of the large-scale anisotropies of cosmic rays with energies above 4 EeV measured using the Pierre Auger Observatory. For the energy bins 4, 8 EeV and E ≥ 8 EeV, the most significant signal is a dipolar modulation in R.A. at energies above 8 EeV, as previously reported. In this paper we further scrutinize the highest-energy bin by splitting it into three energy ranges. We find that the amplitude of the dipole increases with energy above 4 EeV. The growth can be fitted with a power law with index β = 0.79 0.19. The directions of the dipoles are consistent with an extragalactic origin of these anisotropies at all the energies considered. Additionally, we have estimated the quadrupolar components of the anisotropy: they are not statistically significant. We discuss the results in the context of the predictions from different models for the distribution of ultrahigh-energy sources and cosmic magnetic fields.
