Searches for large-scale anisotropy in the arrival directions of cosmic rays detected above energy of 1019 eV at the Pierre auger observatory and the telescope array

Spherical harmonic moments are well-suited for capturing anisotropy at any scale in the flux of cosmic rays. An unambiguous measurement of the full set of spherical harmonic coefficients requires full-sky coverage. This can be achieved by combining data from observatories located in both the norther...

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Autor principal: Multitudinario:607
Formato: JOUR
Materias:
Astroparticle physics
Cosmic rays
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_0004637X_v794_n2_p_Multitudinario
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_0004637X_v794_n2_p_Multitudinario
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spelling todo:paper_0004637X_v794_n2_p_Multitudinario2023-10-03T14:02:36Z Searches for large-scale anisotropy in the arrival directions of cosmic rays detected above energy of 1019 eV at the Pierre auger observatory and the telescope array Multitudinario:607 Astroparticle physics Cosmic rays Spherical harmonic moments are well-suited for capturing anisotropy at any scale in the flux of cosmic rays. An unambiguous measurement of the full set of spherical harmonic coefficients requires full-sky coverage. This can be achieved by combining data from observatories located in both the northern and southern hemispheres. To this end, a joint analysis using data recorded at the Telescope Array and the Pierre Auger Observatory above 10 19 eV is presented in this work. The resulting multipolar expansion of the flux of cosmic rays allows us to perform a series of anisotropy searches, and in particular to report on the angular power spectrum of cosmic rays above 10 19 eV. No significant deviation from isotropic expectations is found throughout the analyses performed. Upper limits on the amplitudes of the dipole and quadrupole moments are derived as a function of the direction in the sky, varying between 7% and 13% for the dipole and between 7% and 10% for a symmetric quadrupole. © 2014. The American Astronomical Society. All rights reserved. Printed in the U.S.A. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_0004637X_v794_n2_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 Astroparticle physics
Cosmic rays
spellingShingle Astroparticle physics
Cosmic rays
Multitudinario:607
Searches for large-scale anisotropy in the arrival directions of cosmic rays detected above energy of 1019 eV at the Pierre auger observatory and the telescope array
topic_facet Astroparticle physics
Cosmic rays
description Spherical harmonic moments are well-suited for capturing anisotropy at any scale in the flux of cosmic rays. An unambiguous measurement of the full set of spherical harmonic coefficients requires full-sky coverage. This can be achieved by combining data from observatories located in both the northern and southern hemispheres. To this end, a joint analysis using data recorded at the Telescope Array and the Pierre Auger Observatory above 10 19 eV is presented in this work. The resulting multipolar expansion of the flux of cosmic rays allows us to perform a series of anisotropy searches, and in particular to report on the angular power spectrum of cosmic rays above 10 19 eV. No significant deviation from isotropic expectations is found throughout the analyses performed. Upper limits on the amplitudes of the dipole and quadrupole moments are derived as a function of the direction in the sky, varying between 7% and 13% for the dipole and between 7% and 10% for a symmetric quadrupole. © 2014. The American Astronomical Society. All rights reserved. Printed in the U.S.A.
format JOUR
author Multitudinario:607
author_facet Multitudinario:607
author_sort Multitudinario:607
title Searches for large-scale anisotropy in the arrival directions of cosmic rays detected above energy of 1019 eV at the Pierre auger observatory and the telescope array
title_short Searches for large-scale anisotropy in the arrival directions of cosmic rays detected above energy of 1019 eV at the Pierre auger observatory and the telescope array
title_full Searches for large-scale anisotropy in the arrival directions of cosmic rays detected above energy of 1019 eV at the Pierre auger observatory and the telescope array
title_fullStr Searches for large-scale anisotropy in the arrival directions of cosmic rays detected above energy of 1019 eV at the Pierre auger observatory and the telescope array
title_full_unstemmed Searches for large-scale anisotropy in the arrival directions of cosmic rays detected above energy of 1019 eV at the Pierre auger observatory and the telescope array
title_sort searches for large-scale anisotropy in the arrival directions of cosmic rays detected above energy of 1019 ev at the pierre auger observatory and the telescope array
url http://hdl.handle.net/20.500.12110/paper_0004637X_v794_n2_p_Multitudinario
work_keys_str_mv AT multitudinario607 searchesforlargescaleanisotropyinthearrivaldirectionsofcosmicraysdetectedaboveenergyof1019evatthepierreaugerobservatoryandthetelescopearray
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