Searches for anisotropies in the arrival directions of the highest energy cosmic rays detected by the pierre auger observatory

We analyze the distribution of arrival directions of ultra-high-energy cosmic rays recorded at the Pierre Auger Observatory in 10 years of operation. The data set, about three times larger than that used in earlier studies, includes arrival directions with zenith angles up to 80°, thus covering from...

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Autor principal: Multitudinario:481
Formato: JOUR
Materias:
acceleration of particles
astroparticle physics
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0004637X_v804_n1_p_Multitudinario
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_0004637X_v804_n1_p_Multitudinario
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spelling todo:paper_0004637X_v804_n1_p_Multitudinario2023-10-03T14:02:37Z Searches for anisotropies in the arrival directions of the highest energy cosmic rays detected by the pierre auger observatory Multitudinario:481 acceleration of particles astroparticle physics We analyze the distribution of arrival directions of ultra-high-energy cosmic rays recorded at the Pierre Auger Observatory in 10 years of operation. The data set, about three times larger than that used in earlier studies, includes arrival directions with zenith angles up to 80°, thus covering from -90°to +45°in declination. After updating the fraction of events correlating with the active galactic nuclei (AGNs) in the Vron-Cetty and Vron catalog, we subject the arrival directions of the data with energies in excess of 40 EeV to different tests for anisotropy. We search for localized excess fluxes, self-clustering of event directions at angular scales up to 30°, and different threshold energies between 40 and 80 EeV. We then look for correlations of cosmic rays with celestial structures both in the Galaxy (the Galactic Center and Galactic Plane) and in the local universe (the Super- Galactic Plane). We also examine their correlation with different populations of nearby extragalactic objects: galaxies in the 2MRS catalog, AGNs detected by Swift-BAT, radio galaxies with jets, and the Centaurus A (Cen A) galaxy. None of the tests show statistically significant evidence of anisotropy. The strongest departures from isotropy (post-trial probability ∼1.4%) are obtained for cosmic rays with E >; 58 EeV in rather large windows around Swift AGNs closer than 130 Mpc and brighter than 10 44 erg s -1 (18° radius), and around the direction of Cen A (15° radius). © 2015. 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_v804_n1_p_Multitudinario
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic acceleration of particles
astroparticle physics
spellingShingle acceleration of particles
astroparticle physics
Multitudinario:481
Searches for anisotropies in the arrival directions of the highest energy cosmic rays detected by the pierre auger observatory
topic_facet acceleration of particles
astroparticle physics
description We analyze the distribution of arrival directions of ultra-high-energy cosmic rays recorded at the Pierre Auger Observatory in 10 years of operation. The data set, about three times larger than that used in earlier studies, includes arrival directions with zenith angles up to 80°, thus covering from -90°to +45°in declination. After updating the fraction of events correlating with the active galactic nuclei (AGNs) in the Vron-Cetty and Vron catalog, we subject the arrival directions of the data with energies in excess of 40 EeV to different tests for anisotropy. We search for localized excess fluxes, self-clustering of event directions at angular scales up to 30°, and different threshold energies between 40 and 80 EeV. We then look for correlations of cosmic rays with celestial structures both in the Galaxy (the Galactic Center and Galactic Plane) and in the local universe (the Super- Galactic Plane). We also examine their correlation with different populations of nearby extragalactic objects: galaxies in the 2MRS catalog, AGNs detected by Swift-BAT, radio galaxies with jets, and the Centaurus A (Cen A) galaxy. None of the tests show statistically significant evidence of anisotropy. The strongest departures from isotropy (post-trial probability ∼1.4%) are obtained for cosmic rays with E >; 58 EeV in rather large windows around Swift AGNs closer than 130 Mpc and brighter than 10 44 erg s -1 (18° radius), and around the direction of Cen A (15° radius). © 2015. The American Astronomical Society. All rights reserved.
format JOUR
author Multitudinario:481
author_facet Multitudinario:481
author_sort Multitudinario:481
title Searches for anisotropies in the arrival directions of the highest energy cosmic rays detected by the pierre auger observatory
title_short Searches for anisotropies in the arrival directions of the highest energy cosmic rays detected by the pierre auger observatory
title_full Searches for anisotropies in the arrival directions of the highest energy cosmic rays detected by the pierre auger observatory
title_fullStr Searches for anisotropies in the arrival directions of the highest energy cosmic rays detected by the pierre auger observatory
title_full_unstemmed Searches for anisotropies in the arrival directions of the highest energy cosmic rays detected by the pierre auger observatory
title_sort searches for anisotropies in the arrival directions of the highest energy cosmic rays detected by the pierre auger observatory
url http://hdl.handle.net/20.500.12110/paper_0004637X_v804_n1_p_Multitudinario
work_keys_str_mv AT multitudinario481 searchesforanisotropiesinthearrivaldirectionsofthehighestenergycosmicraysdetectedbythepierreaugerobservatory
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