Anisotropy signal of ultrahigh-energy cosmic rays from a structured magnetized universe
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A90232%2F25%3A00641947" target="_blank" >RIV/68378271:90232/25:00641947 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.1103/4zt7-s48v" target="_blank" >https://doi.org/10.1103/4zt7-s48v</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/4zt7-s48v" target="_blank" >10.1103/4zt7-s48v</a>
Alternative languages
Result language
angličtina
Original language name
Anisotropy signal of ultrahigh-energy cosmic rays from a structured magnetized universe
Original language description
The surprising isotropy of the ultrahigh-energy cosmic ray (UHECR) sky makes it difficult to identify their sources. Observables such as energy spectrum, mass composition and arrival directions are affected by interactions with background photon fields and by deflection in the extragalactic and galactic magnetic fields (EGMF and GMF). In this work, we simulate the propagation of UHECRs with energy above 8 EeV in magnetized replicas of the local universe, obtained from constrained simulations of the Large Scale Structure. We obtain the real magnetic deflection in structured EGMF models with realistic three-dimensional simulations. We investigate different scenarios for the UHECR source distributions and densities. The effect of the GMF can be different depending on the field model considered. In this work we consider the JF12 model by mapping the arrival directions at the edge of the galaxy to those at Earth. We study the arrival direction distribution of the propagated UHECRs, and in particular their angular power spectrum, dipole and quadrupole moments. We find that the properties of the source distribution affect the cosmic ray anisotropy more than the EGMF model considered. In particular, the low multipole components depend on both the source distribution and the density. We also find that it is difficult to simultaneously reproduce the observed dipole and quadrupole values above 8 EeV. In general, we predict too large a quadrupole strength, incompatible with observations.
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
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Continuities
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Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Physical Review D
ISSN
2470-0010
e-ISSN
2470-0029
Volume of the periodical
112
Issue of the periodical within the volume
2
Country of publishing house
US - UNITED STATES
Number of pages
32
Pages from-to
023015
UT code for WoS article
001537797800005
EID of the result in the Scopus database
2-s2.0-105023505212