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An update on the arrival direction studies made with data from the Pierre Auger Observatory

Pierre Auger Collaboration; Abdul Halim, Adila; Abreu, Pedro; Aglietta, Marco; Allekotte, Ingomar; Almeida Cheminant, Kévin; Almela, Alejandro; Aloisio, Roberto; Alvarez-Muniz, Jaime; Ammerman Yebra, Juan; Anastasi, Gioacchino Alex; Anchordoqui, Luis A.; Andrada, Belén; Andringa, Sofia; Aramo, Carla; Araújo Ferreira, Paulo Ricardo; Arnone, Enrico; Arteaga Velazquez, Juan Carlos; Asorey, Hernán Gonzalo; ... mehr

Abstract (englisch):

The search for anisotropies in the arrival directions of ultra-high-energy cosmic rays plays a key role in the efforts to understand their origin. The observed first-harmonic modulation in right ascension above 8EeV, detected by the Pierre Auger Observatory with a current significance of 6.9σ, suggests an extragalactic origin above this energy. Furthermore, there are indications, at the ∼4σ significance level, of anisotropies at intermediate angular scales, which are obtained when comparing the arrival directions against the distribution of potential sources from astrophysical catalogs, in particular that of nearby starburst galaxies, and around the Centaurus region. In this contribution, we present the status of the different searches for anisotropies at small, intermediate and large angular scales. We use the latest available data set, with 19 years of operation that has yielded 135,000km2yrsr of accumulated exposure, covering the sky at declinations from −90∘ to 45∘. At small and intermediate scales, we report updates of the all-sky blind search for localized excesses, the study around the Centaurus region, and the likelihood analysis with catalogs of candidate sources. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000163329
Veröffentlicht am 07.11.2023
Originalveröffentlichung
DOI: 10.22323/1.444.0252
Dimensions
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Astroteilchenphysik (IAP)
Institut für Experimentelle Teilchenphysik (ETP)
Institut für Prozessdatenverarbeitung und Elektronik (IPE)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2023
Sprache Englisch
Identifikator KITopen-ID: 1000163329
HGF-Programm 51.13.03 (POF IV, LK 01) Kosmische Strahlung Auger
Erschienen in 38th International Cosmic Ray Conference (ICRC2023) - Cosmic-Ray Physics (Indirect, CRI)
Veranstaltung 38th International Cosmic Ray Conference (ICRC 2023), Nagoya, Japan, 26.07.2023 – 03.08.2023
Verlag Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Seiten Art.-Nr.: 252
Serie Proceedings of Science ; 444
Vorab online veröffentlicht am 14.08.2023
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