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https://hdl.handle.net/2440/136473
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Type: | Journal article |
Title: | Arrival Directions of Cosmic Rays above 32 EeV from Phase One of the Pierre Auger Observatory |
Author: | Abreu, P. Aglietta, M. Albury, J.M. Allekotte, I. Cheminant, K.A. Almela, A. Alvarez-Muniz, J. Batista, R.A. Ammerman Yebra, J. Anastasi, G.A. Anchordoqui, L. Andrada, B. Andringa, S. Aramo, C. Ferreira, P.R.A. Arnone, E. Velazquez, J.C.A. Asorey, H. Assis, P. Avila, G. et al. |
Citation: | The Astrophysical Journal: an international review of astronomy and astronomical physics, 2022; 935(2):170-1-170-24 |
Publisher: | American Astronomical Society |
Issue Date: | 2022 |
ISSN: | 0004-637X 1538-4357 |
Statement of Responsibility: | P. Abreu ... J. M. Albury ... J. A. Bellido .... R. W. Clay ... B. R. Dawson ... J. A. Day ... T. D. Grubb ... V. M. Harvey ... G. C. Hill ... B. C. Manning ... T. Sudholz ... et al. (The Pierre Auger Collaboration) |
Abstract: | A promising energy range to look for angular correlations between cosmic rays of extragalactic origin and their sources is at the highest energies, above a few tens of EeV (1 EeV ≡ 1018 eV). Despite the flux of these particles being extremely low, the area of ∼3000 km2 covered at the Pierre Auger Observatory, and the 17 yr data-taking period of the Phase 1 of its operations, have enabled us to measure the arrival directions of more than 2600 ultrahigh- energy cosmic rays above 32 EeV. We publish this data set, the largest available at such energies from an integrated exposure of 122,000 km2 sr yr, and search it for anisotropies over the 3.4π steradians covered with the Observatory. Evidence for a deviation in excess of isotropy at intermediate angular scales, with ∼15° Gaussian spread or ∼25° top-hat radius, is obtained at the 4σ significance level for cosmic-ray energies above ∼40 EeV. |
Rights: | © 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
DOI: | 10.3847/1538-4357/ac7d4e |
Published version: | http://dx.doi.org/10.3847/1538-4357/ac7d4e |
Appears in Collections: | Physics publications |
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hdl_136473.pdf | Published version | 3.92 MB | Adobe PDF | View/Open |
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