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Arrival Directions of Cosmic Rays above 32 EeV from Phase One of the Pierre Auger Observatory
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arxiv 2206.13492 v2 pith:XZXMFJXV submitted 2022-06-27 astro-ph.HE astro-ph.CO
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abstract
A promising energy range to look for angular correlation between cosmic rays of extragalactic origin and their sources is at the highest energies, above few tens of EeV ($1\:{\rm EeV}\equiv 10^{18}\:$eV). Despite the flux of these particles being extremely low, the area of ${\sim}\:3{,}000 \: \text{km}^2$ covered at the Pierre Auger Observatory, and the 17-year data-taking period of the Phase 1 of its operations, have enabled us to measure the arrival directions of more than 2,600 ultra-high energy cosmic rays above $32\:\text{EeV}$. We publish this data set, the largest available at such energies from an integrated exposure of $122{,}000 \: \text{km}^2\:\text{sr}\:\text{yr}$, and search it for anisotropies over the $3.4\pi$ steradians covered with the Observatory. Evidence for a deviation in excess of isotropy at intermediate angular scale, with ${\sim}\:15^\circ$ Gaussian spread or ${\sim}\:25^\circ$ top-hat radius, is obtained at the $4\:\sigma$ significance level for cosmic-ray energies above ${\sim}\:40\:\text{EeV}$.
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Cited by 2 Pith papers
Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record
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New full-sky studies of the distribution of ultra-high-energy cosmic-ray arrival directions
astro-ph.HE 2025-07 conditional novelty 6.0 of 10
Full-sky UHECR arrival directions remain most correlated with starburst galaxies (4.2 sigma post-trial) after adding Telescope Array data, atmospheric corrections, and a new harmonic-space analysis.
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Cosmic-ray anisotropy: sensitivity of methods and implications for KASCADE data
astro-ph.HE 2026-07 conditional novelty 5.0 of 10
Autocorrelation is more sensitive than angular power spectrum to most medium/small-scale cosmic-ray anisotropies under limited FOV; KASCADE 10% data show >2.5σ iron anisotropy at ~10° and E≳20 PeV.
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