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Title: Astrophysical interpretation of energy spectrum and mass composition of cosmic rays as measured at the Pierre Auger Observatory Authors: ID Guido, Eleonora (Author) ID Filipčič, Andrej (Author) ID Lundquist, Jon Paul (Author) ID Shivashankara, Shima Ujjani (Author) ID Stanič, Samo (Author) ID Vorobiov, Serguei (Author) ID Zavrtanik, Danilo (Author) ID Zavrtanik, Marko (Author), et al. Files: TAUP2023_125.pdf (381,66 KB) MD5: D03BE3547982E06BE766DBDDC1881FD1   https://pos.sissa.it/441/   https://www.auger.org/archive/authors_2023_11.html   This document has even more files. Complete list of files is available below. Language: English Work type: Unknown Typology: 1.08 - Published Scientific Conference Contribution Organization: UNG - University of Nova Gorica Abstract: The combined interpretation of the spectrum and composition measurements plays a key role in the quest for the origin of ultra-high-energy cosmic rays (UHECRs). The Pierre Auger Observatory, thanks to its huge exposure, provides the most precise measurement of the energy spectrum of UHECRs and the most reliable information on their composition, exploiting the distributions of the depth of maximum of the showers in the atmosphere. A combined fit of a simple astrophysical model of UHECR sources to the spectrum and mass composition measurements is used to evaluate the constraining power of the data measured by the Pierre Auger Observatory on the source properties. We find that our data across the “ankle” feature are well reproduced if two extragalactic populations of sources are considered, one emitting a very soft spectrum which dominates the region below the ankle, and the other taking over at energies above the ankle, with an intermediate mixed composition, a hard spectrum and a low rigidity cutoff. Interestingly, similar results can also be obtained if the medium-mass contribution at lower energy is provided by an additional galactic component. Keywords: Pierre Auger Observatory, ultra-high energy cosmic rays, UHECR energy spectrum, UHECR mass composition Publication status: Published Publication version: Version of Record Year of publishing: 2023 Number of pages: Str. 1-5 PID: 20.500.12556/RUNG-8818  COBISS.SI-ID: 182281731  UDC: 52 ISSN on article: 1824-8039 DOI: 10.22323/1.441.0125  NUK URN: URN:SI:UNG:REP:QH6FU943 Publication date in RUNG: 24.01.2024 Views: 478 Downloads: 7 Metadata:     Cite this work Plain text BibTeX EndNote XML EndNote/Refer RIS ABNT ACM Ref AMA APA Chicago 17th Author-Date Harvard IEEE ISO 690 MLA Vancouver : Copy citation

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Record is a part of a proceedings

Title:	XVIII International Conference on Topics in Astroparticle and Underground Physics [also] TAUP2023
COBISS.SI-ID:	182275843

Record is a part of a journal

Title:	Proceedings of science
Shortened title:	Pos proc. sci.
Publisher:	Sissa
ISSN:	1824-8039
COBISS.SI-ID:	20239655

Document is financed by a project

Funder:	ARRS - Slovenian Research Agency
Project number:	P1-0031
Name:	Večglasniška astrofizika

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Funder:	ARRS - Slovenian Research Agency
Project number:	N1-0111
Name:	Identifikacija izvorov kozmičnih žarkov med aktivnimi galaksijami s curki

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License:	CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:	http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:	The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

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