Constraining the sources of ultra-high-energy cosmic rays across and above the ankle with the spectrum and composition data measured at the Pierre Auger Observatory

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dc.contributor.authorAbdul Halim, A.
dc.contributor.authorAbreu, P.
dc.contributor.authorAglietta, M.
dc.contributor.authorAllekotte, I.
dc.contributor.authorAlmeida Cheminant, K.
dc.contributor.authorAlmela, A.
dc.contributor.authorAlvarez-Muñiz, J.
dc.contributor.authorAmmerman Yebra, J.
dc.contributor.authorAnastasi, G.A.
dc.contributor.authorAnchordoqui, L.
dc.contributor.authorAndrada, B.
dc.contributor.authorAndringa, S.
dc.contributor.authorAramo, C.
dc.contributor.authorAraújo Ferreira, P.R.
dc.contributor.authorArnone, E.
dc.contributor.authorArteaga Velázquez, J.C.
dc.contributor.authorAsorey, H.
dc.contributor.authorAssis, P.
dc.contributor.authorAvila, G.
dc.contributor.authorAvocone, E.
dc.contributor.authoret al.
dc.date.issued2023
dc.descriptionPublished May 10, 2023
dc.description.abstractIn this work we present the interpretation of the energy spectrum and mass composition data as measured by the Pierre Auger Collaboration above 6×10¹⁷ eV. We use an astrophysical model with two extragalactic source populations to model the hardening of the cosmic-ray flux at around 5×10¹⁸ eV (the so-called “ankle” feature) as a transition between these two components. We find our data to be well reproduced if sources above the ankle emit a mixed composition with a hard spectrum and a low rigidity cutoff. The component below the ankle is required to have a very soft spectrum and a mix of protons and intermediate-mass nuclei. The origin of this intermediate-mass component is not well constrained and it could originate from either Galactic or extragalactic sources. To the aim of evaluating our capability to constrain astrophysical models, we discuss the impact on the fit results of the main experimental systematic uncertainties and of the assumptions about quantities affecting the air shower development as well as the propagation and redshift distribution of injected ultra-high-energy cosmic rays (UHECRs).
dc.description.statementofresponsibilityThe Pierre Auger Collaboration ... A. Abdul Halim ... J.A. Bellido ... R.W. Clay ... B.R. Dawson ... T.D. Grubb ... V.M. Harvey ... B.C. Manning ... et al.
dc.identifier.citationJournal of Cosmology and Astroparticle Physics, 2023; 2023(5):024-0-024-49
dc.identifier.doi10.1088/1475-7516/2023/05/024
dc.identifier.issn1475-7516
dc.identifier.issn1475-7516
dc.identifier.orcidAbdul Halim, A. [0000-0003-1218-1737]
dc.identifier.orcidBellido, J.A. [0000-0002-0833-9194]
dc.identifier.orcidClay, R.W. [0000-0002-9040-9648]
dc.identifier.orcidDawson, B.R. [0000-0002-4271-3055]
dc.identifier.orcidHarvey, V. [0000-0001-9090-8415]
dc.identifier.orcidManning, B. [0000-0002-2715-4478]
dc.identifier.urihttps://hdl.handle.net/2440/139538
dc.language.isoen
dc.publisherIOP Publishing
dc.relation.grantARC
dc.rights© 2023 The Author(s). Published by IOP Publishing Ltd on behalf of Sissa Medialab. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
dc.source.urihttps://doi.org/10.1088/1475-7516/2023/05/024
dc.subjectcosmic ray experiments
dc.subjectcosmic ray theory
dc.subjectparticle acceleration
dc.subjectultra high energy cosmic rays
dc.titleConstraining the sources of ultra-high-energy cosmic rays across and above the ankle with the spectrum and composition data measured at the Pierre Auger Observatory
dc.typeJournal article
pubs.publication-statusPublished

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