> Details
Abreu, P.;
Aglietta, M.;
Albury, J. M.;
Allekotte, I.;
Almeida Cheminant, K.;
Almela, A.;
Alvarez-Muñiz, J.;
Alves Batista, R.;
Ammerman Yebra, J.;
Anastasi, G. A.;
Anchordoqui, L.;
Andrada, B.;
Andringa, S.;
Aramo, C.;
Araújo Ferreira, P. R.;
Arnone, E.;
Arteaga Velázquez, J. C.;
Asorey, H.;
Assis, P.;
Avila, G.;
Avocone, E.;
Badescu, A. M.;
Bakalova, A.;
Balaceanu, A.;
[...]
Arrival Directions of Cosmic Rays above 32 EeV from Phase One of the Pierre Auger Observatory
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- Media type: E-Article
- Title: Arrival Directions of Cosmic Rays above 32 EeV from Phase One of the Pierre Auger Observatory
- Contributor: Abreu, P.; Aglietta, M.; Albury, J. M.; Allekotte, I.; Almeida Cheminant, K.; Almela, A.; Alvarez-Muñiz, J.; Alves Batista, R.; Ammerman Yebra, J.; Anastasi, G. A.; Anchordoqui, L.; Andrada, B.; Andringa, S.; Aramo, C.; Araújo Ferreira, P. R.; Arnone, E.; Arteaga Velázquez, J. C.; Asorey, H.; Assis, P.; Avila, G.; Avocone, E.; Badescu, A. M.; Bakalova, A.; Balaceanu, A.; [...]
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imprint:
American Astronomical Society, 2022
- Published in: The Astrophysical Journal
- Language: Not determined
- DOI: 10.3847/1538-4357/ac7d4e
- ISSN: 0004-637X; 1538-4357
- Keywords: Space and Planetary Science ; Astronomy and Astrophysics
- Origination:
- Footnote:
- Description: <jats:title>Abstract</jats:title> <jats:p>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 ≡ 10<jats:sup>18</jats:sup> eV). Despite the flux of these particles being extremely low, the area of ∼3000 km<jats:sup>2</jats:sup> covered at the Pierre Auger Observatory, and the 17 yr data-taking period of the <jats:italic>Phase</jats:italic> <jats:italic>1</jats:italic> of its operations, have enabled us to measure the arrival directions of more than 2600 ultra-high-energy cosmic rays above 32 EeV. We publish this data set, the largest available at such energies from an integrated exposure of 122,000 km<jats:sup>2</jats:sup> sr yr, and search it for anisotropies over the 3.4<jats:italic>π</jats:italic> 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 4<jats:italic>σ</jats:italic> significance level for cosmic-ray energies above ∼40 EeV.</jats:p>
- Access State: Open Access