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 right ascension at energies above 8 EeV, as previousl...

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Detalles Bibliográficos
Autores principales: Calcagni, Laura Randa, Dova, María Teresa, Hansen, Patricia María, Mariazzi, Analisa Gabriela, Sciutto, Sergio Juan, Tueros, Matías Jorge, Vergara Quispe, Indira Dajhana, Wahlberg, Hernán Pablo, The Pierre Auger Collaboration
Formato: Articulo
Lenguaje:Inglés
Publicado: 2018
Materias:
Física
Cosmic ray
Physics
Dipole
Amplitude
Pierre auger observatory
Context (language use)
Astrophysics
Cosmic cancer database
Right ascension
Anisotropy
Observatory
Auger
Astroparticle physics
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/125623
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-125623
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Física
Cosmic ray
Physics
Dipole
Amplitude
Pierre auger observatory
Context (language use)
Astrophysics
Cosmic cancer database
Right ascension
Anisotropy
Observatory
Auger
Astroparticle physics
spellingShingle Física
Cosmic ray
Physics
Dipole
Amplitude
Pierre auger observatory
Context (language use)
Astrophysics
Cosmic cancer database
Right ascension
Anisotropy
Observatory
Auger
Astroparticle physics
Calcagni, Laura Randa
Dova, María Teresa
Hansen, Patricia María
Mariazzi, Analisa Gabriela
Sciutto, Sergio Juan
Tueros, Matías Jorge
Vergara Quispe, Indira Dajhana
Wahlberg, Hernán Pablo
The Pierre Auger Collaboration
Large-scale cosmic-ray anisotropies above 4 EeV measured by the Pierre Auger Observatory
topic_facet Física
Cosmic ray
Physics
Dipole
Amplitude
Pierre auger observatory
Context (language use)
Astrophysics
Cosmic cancer database
Right ascension
Anisotropy
Observatory
Auger
Astroparticle physics
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 right ascension 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.
format Articulo
Articulo
author Calcagni, Laura Randa
Dova, María Teresa
Hansen, Patricia María
Mariazzi, Analisa Gabriela
Sciutto, Sergio Juan
Tueros, Matías Jorge
Vergara Quispe, Indira Dajhana
Wahlberg, Hernán Pablo
The Pierre Auger Collaboration
author_facet Calcagni, Laura Randa
Dova, María Teresa
Hansen, Patricia María
Mariazzi, Analisa Gabriela
Sciutto, Sergio Juan
Tueros, Matías Jorge
Vergara Quispe, Indira Dajhana
Wahlberg, Hernán Pablo
The Pierre Auger Collaboration
author_sort Calcagni, Laura Randa
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 http://sedici.unlp.edu.ar/handle/10915/125623
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