Impact of the magnetic horizon on the interpretation of the Pierre Auger Observatory spectrum and composition data
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F24%3A00605641" target="_blank" >RIV/68378271:_____/24:00605641 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11320/24:10493926 RIV/61989592:15310/24:73628478
Result on the web
<a href="https://hdl.handle.net/11104/0363294" target="_blank" >https://hdl.handle.net/11104/0363294</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1475-7516/2024/07/094" target="_blank" >10.1088/1475-7516/2024/07/094</a>
Alternative languages
Result language
angličtina
Original language name
Impact of the magnetic horizon on the interpretation of the Pierre Auger Observatory spectrum and composition data
Original language description
The flux of ultra-high energy cosmic rays reaching Earth above the ankle energy (5 EeV) can be described as a mixture of nuclei injected by extragalactic sources with very hard spectra and a low rigidity cutoff. Extragalactic magnetic fields existing between the Earth and the closest sources can affect the observed CR spectrum by reducing the flux of low-rigidity particles reaching Earth. We perform a combined fit of the spectrum and distributions of depth of shower maximum measured with the Pierre Auger Observatory including the effect of this magnetic horizon in the propagation of UHECRs in the intergalactic space. We find that, within a specific range of the various experimental and phenomenological systematics, the magnetic horizon effect can be relevant for turbulent magnetic field strengths in the local neighbourhood in which the closest sources lie of order B-rms similar or equal to (50-100) nG(20Mpc/ds)(100 kpc/L-coh)(1/2), with d(s) the typical intersource separation and L-coh the magnetic field coherence length. When this is the case, the inferred slope of the source spectrum becomes softer and can be closer to the expectations of diffusive shock acceleration, i.e., proportional to E-2. An additional cosmic-ray population with higher source density and softer spectra, presumably also extragalactic and dominating the cosmic-ray flux at EeV energies, is also required to reproduce the overall spectrum and composition results for all energies down to 0.6 EeV.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10303 - Particles and field physics
Result continuities
Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of Cosmology and Astroparticle Physics
ISSN
1475-7516
e-ISSN
1475-7516
Volume of the periodical
2024
Issue of the periodical within the volume
7
Country of publishing house
US - UNITED STATES
Number of pages
31
Pages from-to
094
UT code for WoS article
001371213400001
EID of the result in the Scopus database
2-s2.0-85200904195