Large-scale anisotropies of ultra-high-energy cosmic rays measured at the Pierre Auger Observatory
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866913959854997504 |
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| author | Bianciotto, Marta |
| author_facet | Bianciotto, Marta |
| contents | Measurements of anisotropies in the arrival directions of ultra-high-energy cosmic rays are crucial to pinpoint their sources, which are yet to be discovered. A dipolar anisotropy in right ascension above 8~EeV has been detected by the Pierre Auger Observatory with a significance of $6.8 σ$. The direction of the dipole suggests an extragalactic origin of ultra-high-energy cosmic rays above those energies. In this contribution, we provide an overview of the studies on large-scale anisotropies in the arrival directions of ultra-high-energy cosmic rays measured at the Pierre Auger Observatory with energy thresholds from $\sim 0.03$~EeV up to $32$~EeV and we present and discuss the recent results achieved with the latest available dataset, which includes 19 years of operations -- resulting in a total exposure of 123,000~km$^2$~sr~yr and nearly 50,000 events above 8~EeV. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2507_19243 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Large-scale anisotropies of ultra-high-energy cosmic rays measured at the Pierre Auger Observatory Bianciotto, Marta High Energy Astrophysical Phenomena High Energy Physics - Phenomenology Measurements of anisotropies in the arrival directions of ultra-high-energy cosmic rays are crucial to pinpoint their sources, which are yet to be discovered. A dipolar anisotropy in right ascension above 8~EeV has been detected by the Pierre Auger Observatory with a significance of $6.8 σ$. The direction of the dipole suggests an extragalactic origin of ultra-high-energy cosmic rays above those energies. In this contribution, we provide an overview of the studies on large-scale anisotropies in the arrival directions of ultra-high-energy cosmic rays measured at the Pierre Auger Observatory with energy thresholds from $\sim 0.03$~EeV up to $32$~EeV and we present and discuss the recent results achieved with the latest available dataset, which includes 19 years of operations -- resulting in a total exposure of 123,000~km$^2$~sr~yr and nearly 50,000 events above 8~EeV. |
| title | Large-scale anisotropies of ultra-high-energy cosmic rays measured at the Pierre Auger Observatory |
| topic | High Energy Astrophysical Phenomena High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2507.19243 |