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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Detalles Bibliográficos
Publicado: 2018
Materias:
astroparticle physics
cosmic rays
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v868_n1_p_Aab
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 paper:paper_0004637X_v868_n1_p_Aab
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spelling paper:paper_0004637X_v868_n1_p_Aab2023-06-08T14:29:21Z Large-scale Cosmic-Ray Anisotropies above 4 EeV Measured by the Pierre Auger Observatory 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.. 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v868_n1_p_Aab 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
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..
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
publishDate 2018
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v868_n1_p_Aab
http://hdl.handle.net/20.500.12110/paper_0004637X_v868_n1_p_Aab
_version_ 1768545582086881280

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