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
Povzetek
In this work we present the interpretation of the energy spectrum and mass composition data as measured by the Pierre Auger Collaboration above 6 × 10[sup]17 eV. We use an astrophysical model with two extragalactic source populations to model the hardening of the cosmic-ray flux at around 5 × 10[sup]18 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).
Ključne besede
ultra-high-energy cosmic rays;Pierre Auger Observatory;extensive air showers;UHECR propagation;UHECR energy spectrum;UHECR mass composition;
Podatki
| Jezik: | Angleški jezik |
|---|---|
| Leto izida: | 2023 |
| Tipologija: | 1.01 - Izvirni znanstveni članek |
| Organizacija: | UNG - Univerza v Novi Gorici |
| UDK: | 52 |
| COBISS: |
161599747
|
| ISSN: | 1475-7516 |
| Št. ogledov: | 625 |
| Št. prenosov: | 8 |
| Ocena: | 0 (0 glasov) |
| Metapodatki: |
|
Ostali podatki
| Vrsta dela (COBISS): | Delo ni kategorizirano |
|---|---|
| Strani: | str. 1-49 |
| Letnik: | ǂVol. ǂ2023 |
| Zvezek: | ǂno. ǂ5, [article no.] 024 |
| Čas izdaje: | May 2023 |
| DOI: | 10.1088/1475-7516/2023/05/024 |
| ID: | 21843027 |
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