Cosmic-Ray Anisotropies in Right Ascension Measured by the Pierre Auger Observatory

We present measurements of the large-scale cosmic-ray anisotropies in right ascension, using data collected by the surface detector array of the Pierre Auger Observatory over more than 14 years. We determine the equatorial dipole component, ~d⊥, through a Fourier analysis in right ascension that inc...

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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:	2020
Materias:	Física Cosmic ray Physics Galactic center Dipole Pierre auger observatory Extragalactic cosmic ray Observatory Astrophysics Right ascension Galaxy Amplitude Energy (signal processing)
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/125507
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-125507
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 Galactic center Dipole Pierre auger observatory Extragalactic cosmic ray Observatory Astrophysics Right ascension Galaxy Amplitude Energy (signal processing)
spellingShingle	Física Cosmic ray Physics Galactic center Dipole Pierre auger observatory Extragalactic cosmic ray Observatory Astrophysics Right ascension Galaxy Amplitude Energy (signal processing) 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 Cosmic-Ray Anisotropies in Right Ascension Measured by the Pierre Auger Observatory
topic_facet	Física Cosmic ray Physics Galactic center Dipole Pierre auger observatory Extragalactic cosmic ray Observatory Astrophysics Right ascension Galaxy Amplitude Energy (signal processing)
description	We present measurements of the large-scale cosmic-ray anisotropies in right ascension, using data collected by the surface detector array of the Pierre Auger Observatory over more than 14 years. We determine the equatorial dipole component, ~d⊥, through a Fourier analysis in right ascension that includes weights for each event so as to account for the main detector-induced systematic effects. For the energies at which the trigger efficiency of the array is small, the “East-West” method is employed. Besides using the data from the array with detectors separated by 1500 m, we also include data from the smaller but denser sub-array of detectors with 750 m separation, which allows us to extend the analysis down to ∼ 0.03 EeV. The most significant equatorial dipole amplitude obtained is that in the cumulative bin above 8 EeV, d⊥ = 6.0 +1.0 −0.9%, which is inconsistent with isotropy at the 6σ level. In the bins below 8 EeV, we obtain 99% CL upper-bounds on d⊥ at the level of 1 to 3 percent. At energies below 1 EeV, even though the amplitudes are not significant, the phases determined in most of the bins are not far from the right ascension of the Galactic center, at αGC = −94◦ , suggesting a predominantly Galactic origin for anisotropies at these energies. The reconstructed dipole phases in the energy bins above 4 EeV point instead to right ascensions that are almost opposite to the Galactic center one, indicative of an extragalactic cosmic ray origin.
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	Cosmic-Ray Anisotropies in Right Ascension Measured by the Pierre Auger Observatory
title_short	Cosmic-Ray Anisotropies in Right Ascension Measured by the Pierre Auger Observatory
title_full	Cosmic-Ray Anisotropies in Right Ascension Measured by the Pierre Auger Observatory
title_fullStr	Cosmic-Ray Anisotropies in Right Ascension Measured by the Pierre Auger Observatory
title_full_unstemmed	Cosmic-Ray Anisotropies in Right Ascension Measured by the Pierre Auger Observatory
title_sort	cosmic-ray anisotropies in right ascension measured by the pierre auger observatory
publishDate	2020
url	http://sedici.unlp.edu.ar/handle/10915/125507
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Cosmic-Ray Anisotropies in Right Ascension Measured by the Pierre Auger Observatory

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