Multi-resolution anisotropy studies of ultrahigh-energy cosmic rays detected at the Pierre Auger Observatory

Aab, A.; Abreu, P.; Andringa, S.; Aglietta, M.; Samarai, I. Al; Albuquerque, I. F.M.; Allekotte, I.; Almela, A.; Andrada, B.; Castillo, J. Alvarez; Alvarez-Muñiz, J.; Anastasi, G. A.; others, and

doi:10.1088/1475-7516/2017/06/026

Multi-resolution anisotropy studies of ultrahigh-energy cosmic rays detected at the Pierre Auger Observatory

Journal Article · Thu Jun 01 04:00:00 EDT 2017 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2017/06/026· OSTI ID:22676159

Aab, A. ^[1]; Abreu, P.; Andringa, S. ^[2]; Aglietta, M. ^[3]; Samarai, I. Al ^[4]; Albuquerque, I. F.M. ^[5]; Allekotte, I. ^[6]; Almela, A.; Andrada, B. ^[7]; Castillo, J. Alvarez ^[8]; Alvarez-Muñiz, J. ^[9]; Anastasi, G. A. ^[10]; others, and

Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud Universiteit, Nijmegen (Netherlands)
Laboratório de Instrumentação e Física Experimental de Partículas—LIP and Instituto Superior Técnico—IST, Universidade de Lisboa—UL (Portugal)
Osservatorio Astrofisico di Torino (INAF), Torino (Italy)
Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE), Universités Paris 6 et Paris 7, CNRS-IN2P3 (France)
Universidade de São Paulo, Inst. de Física, São Paulo (Brazil)
Centro Atómico Bariloche and Instituto Balseiro (CNEA-UNCuyo-CONICET) (Argentina)
Instituto de Tecnologías en Detección y Astropartículas (CNEA, CONICET, UNSAM), Centro Atómico Constituyentes, Comisión Nacional de Energía Atómica (Argentina)
Universidad Nacional Autónoma de México, México (Mexico)
Universidad de Santiago de Compostela (Spain)
Gran Sasso Science Institute (INFN), L'Aquila (Italy)

We report a multi-resolution search for anisotropies in the arrival directions of cosmic rays detected at the Pierre Auger Observatory with local zenith angles up to 80{sup o} and energies in excess of 4 EeV (4 × 10{sup 18} eV). This search is conducted by measuring the angular power spectrum and performing a needlet wavelet analysis in two independent energy ranges. Both analyses are complementary since the angular power spectrum achieves a better performance in identifying large-scale patterns while the needlet wavelet analysis, considering the parameters used in this work, presents a higher efficiency in detecting smaller-scale anisotropies, potentially providing directional information on any observed anisotropies. No deviation from isotropy is observed on any angular scale in the energy range between 4 and 8 EeV. Above 8 EeV, an indication for a dipole moment is captured; while no other deviation from isotropy is observed for moments beyond the dipole one. The corresponding p -values obtained after accounting for searches blindly performed at several angular scales, are 1.3 × 10{sup −5} in the case of the angular power spectrum, and 2.5 × 10{sup −3} in the case of the needlet analysis. While these results are consistent with previous reports making use of the same data set, they provide extensions of the previous works through the thorough scans of the angular scales.

OSTI ID:: 22676159

Journal Information:: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 06 Vol. 2017; ISSN 1475-7516

Country of Publication:: United States

Language:: English

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Observation of Anisotropy of TeV Cosmic Rays with Two Years of HAWC Abeysekara, A. U.; Alfaro, R.; Alvarez, C. The Astrophysical Journal, Vol. 865, Issue 1 https://doi.org/10.3847/1538-4357/aad90c	journal	September 2018
Probing large-scale magnetism with the Cosmic Microwave Background Giovannini, Massimo arXiv https://doi.org/10.48550/arxiv.1712.07598	text	January 2017
The Giant Radio Array for Neutrino Detection (GRAND): Science and Design Collaboration, Grand; Alvarez-Muniz, Jaime; Batista, Rafael Alves arXiv https://doi.org/10.48550/arxiv.1810.09994	text	January 2018
Probing large-scale magnetism with the cosmic microwave background Giovannini, Massimo Classical and Quantum Gravity, Vol. 35, Issue 8 https://doi.org/10.1088/1361-6382/aab17d	journal	March 2018
The Giant Radio Array for Neutrino Detection (GRAND): Science and design Álvarez-Muñiz, Jaime; Alves Batista, Rafael; Balagopal V., Aswathi Science China Physics, Mechanics & Astronomy, Vol. 63, Issue 1 https://doi.org/10.1007/s11433-018-9385-7	journal	August 2019
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