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Combined fit to the spectrum and composition data measured by the Pierre Auger Observatory including magnetic horizon effects

Pierre Auger Collaboration; Gonzalez, Juan Manuel; 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; ... mehr

Abstract:

The measurements by the Pierre Auger Observatory of the energy spectrum and mass composition of cosmic rays can be interpreted assuming the presence of two extragalactic source populations, one dominating the flux at energies above a few EeV and the other below. To fit the data ignoring magnetic field effects, the high-energy population needs to accelerate a mixture of nuclei with very hard spectra, at odds with the approximate E$^{-2}$ shape expected from diffusive shock acceleration. The presence of turbulent extragalactic magnetic fields in the region between the closest sources and the Earth can significantly modify the observed CR spectrum with respect to that emitted by the sources, reducing the flux of low-rigidity particles that reach the Earth. We here take into account this magnetic horizon effect in the combined fit of the spectrum and shower depth distributions, exploring the possibility that a spectrum for the high-energy population sources with a shape closer to E$^{-2}$ be able to explain the observations.


Verlagsausgabe §
DOI: 10.5445/IR/1000163336
Veröffentlicht am 27.10.2023
Originalveröffentlichung
DOI: 10.22323/1.444.0288
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Zitationen: 3
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 ISSN: 1824-39
KITopen-ID: 1000163336
HGF-Programm 51.13.03 (POF IV, LK 01) Kosmische Strahlung Auger
Erschienen in Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023), Nagoya, 25th July - 3rd August 2023
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. 288
Serie Proceedings of Science ; 444
Vorab online veröffentlicht am 25.07.2023
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