Astrophysical interpretations of the data measured at the Pierre Auger Observatory

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F25%3A73634859" target="_blank" >RIV/61989592:15310/25:73634859 - isvavai.cz</a>

Výsledek na webu

<a href="https://iopscience.iop.org/article/10.1088/1742-6596/3053/1/012007/pdf" target="_blank" >https://iopscience.iop.org/article/10.1088/1742-6596/3053/1/012007/pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1742-6596/3053/1/012007" target="_blank" >10.1088/1742-6596/3053/1/012007</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Astrophysical interpretations of the data measured at the Pierre Auger Observatory

Popis výsledku v původním jazyce

The Pierre Auger Observatory measures several characteristics of ultra-highenergy cosmic rays (UHECRs), in particular the energies, the depths of shower maximum of the air-shower profiles, and the arrival directions. Using the energy spectrum and the distributions of depths of shower maximum in a combined fit, the parameters of homogeneously distributed UHECR sources can be constrained. We find that the data are well reproduced if two extragalactic populations of sources are considered, one emitting a soft spectrum dominating below the ankle, and one with a very hard spectrum and mixed composition dominating at the highest energies. In the case of very strong extragalactic magnetic fields between the closest sources and Earth, the spectral index of the high-energy population can be much softer and even in agreement with the expectations from shock acceleration. When taking into account also the arrival directions, it is revealed that adding a population of nearby starburst galaxies to the homogeneous background leads to an improvement of the model likelihood to the 4.5a significance level. The energy-dependent arrival directions at the highest energies are well described by flux contributions from the starburst galaxy catalog or the nearby radio galaxy Centaurus A.

Název v anglickém jazyce

Astrophysical interpretations of the data measured at the Pierre Auger Observatory

Popis výsledku anglicky

The Pierre Auger Observatory measures several characteristics of ultra-highenergy cosmic rays (UHECRs), in particular the energies, the depths of shower maximum of the air-shower profiles, and the arrival directions. Using the energy spectrum and the distributions of depths of shower maximum in a combined fit, the parameters of homogeneously distributed UHECR sources can be constrained. We find that the data are well reproduced if two extragalactic populations of sources are considered, one emitting a soft spectrum dominating below the ankle, and one with a very hard spectrum and mixed composition dominating at the highest energies. In the case of very strong extragalactic magnetic fields between the closest sources and Earth, the spectral index of the high-energy population can be much softer and even in agreement with the expectations from shock acceleration. When taking into account also the arrival directions, it is revealed that adding a population of nearby starburst galaxies to the homogeneous background leads to an improvement of the model likelihood to the 4.5a significance level. The energy-dependent arrival directions at the highest energies are well described by flux contributions from the starburst galaxy catalog or the nearby radio galaxy Centaurus A.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

10303 - Particles and field physics

Projekt

<a href="/cs/project/EH22_008%2F0004632" target="_blank" >EH22_008/0004632: Výzkum základních stavebních kamenů hmoty s využitím špičkových technologií</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Journal of Physics: Conference Series (online)

ISBN

—

ISSN

1742-6596

e-ISSN

—

Počet stran výsledku

6

Strana od-do

"012007-1"-"012007-6"

Název nakladatele

Institute of Physics

Místo vydání

Bristol

Místo konání akce

Trapani, Itálie

Datum konání akce

17. 6. 2024

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

001582869000007