Large-scale Cosmic-Ray Anisotropies above 4 EeV Measured by the Pierre Auger Observatory

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....

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Autor principal: Aab, A.
Formato: JOUR
Materias:
astroparticle physics
cosmic rays
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0004637X_v868_n1_p_Aab
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_0004637X_v868_n1_p_Aab
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spelling todo:paper_0004637X_v868_n1_p_Aab2023-10-03T14:02:45Z Large-scale Cosmic-Ray Anisotropies above 4 EeV Measured by the Pierre Auger Observatory Aab, A. astroparticle physics cosmic rays 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. © 2018. The American Astronomical Society. All rights reserved.. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0004637X_v868_n1_p_Aab
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic astroparticle physics
cosmic rays
spellingShingle astroparticle physics
cosmic rays
Aab, A.
Large-scale Cosmic-Ray Anisotropies above 4 EeV Measured by the Pierre Auger Observatory
topic_facet astroparticle physics
cosmic rays
description 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. © 2018. The American Astronomical Society. All rights reserved..
format JOUR
author Aab, A.
author_facet Aab, A.
author_sort Aab, A.
title Large-scale Cosmic-Ray Anisotropies above 4 EeV Measured by the Pierre Auger Observatory
title_short Large-scale Cosmic-Ray Anisotropies above 4 EeV Measured by the Pierre Auger Observatory
title_full Large-scale Cosmic-Ray Anisotropies above 4 EeV Measured by the Pierre Auger Observatory
title_fullStr Large-scale Cosmic-Ray Anisotropies above 4 EeV Measured by the Pierre Auger Observatory
title_full_unstemmed Large-scale Cosmic-Ray Anisotropies above 4 EeV Measured by the Pierre Auger Observatory
title_sort large-scale cosmic-ray anisotropies above 4 eev measured by the pierre auger observatory
url http://hdl.handle.net/20.500.12110/paper_0004637X_v868_n1_p_Aab
work_keys_str_mv AT aaba largescalecosmicrayanisotropiesabove4eevmeasuredbythepierreaugerobservatory
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