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https://hdl.handle.net/2440/117615
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Type: | Journal article |
Title: | Large-scale cosmic-ray anisotropies above 4 EeV measured by the Pierre Auger Observatory |
Author: | Aab, A. Abreu, P. Aglietta, M. Albuquerque, I. Albury, J. Allekotte, I. Almela, A. Castillo, J. Alvarez-Muñiz, J. Anastasi, G. Anchordoqui, L. Andrada, B. Andringa, S. Aramo, C. Asorey, H. Assis, P. Avila, G. Badescu, A. Balaceanu, A. Barbato, F. et al. |
Citation: | The Astrophysical Journal: an international review of astronomy and astronomical physics, 2018; 868(1):4-1-4-12 |
Publisher: | IOP Publishing |
Issue Date: | 2018 |
ISSN: | 0004-637X 1538-4357 |
Statement of Responsibility: | A. Aab ... J.M. Albury … J.A. Bellido … S.G. Blaess … R.W. Clay … M.J. Cooper … B.R. Dawson, J.A. Day … T.D. Grubb … T.A. Harrison, V.M. Harvey … G.C. Hill … S.J. Saffi … T. Sudholz … P. van Bodegom … [et al.] (The Pierre Auger Collaboration) |
Abstract: | 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. |
Keywords: | Astroparticle physics; cosmic rays |
Rights: | © 2018. The American Astronomical Society. All rights reserved. |
DOI: | 10.3847/1538-4357/aae689 |
Grant ID: | ARC |
Published version: | http://dx.doi.org/10.3847/1538-4357/aae689 |
Appears in Collections: | Aurora harvest 3 Physics publications |
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