Ultra-high-energy cosmic-ray sources can be gamma-ray dim
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A90232%2F24%3A00641982" target="_blank" >RIV/68378271:90232/24:00641982 - isvavai.cz</a>
Result on the web
<a href="https://doi.org/10.3847/2041-8213/ad4359" target="_blank" >https://doi.org/10.3847/2041-8213/ad4359</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3847/2041-8213/ad4359" target="_blank" >10.3847/2041-8213/ad4359</a>
Alternative languages
Result language
angličtina
Original language name
Ultra-high-energy cosmic-ray sources can be gamma-ray dim
Original language description
Ultra-high-energy cosmic rays (UHECRs), accelerated hadrons that can exceed energies of 1020 eV, are the highest-energy particles ever observed. While the sources producing UHECRs are still unknown, the Pierre Auger Observatory has detected a large-scale dipole anisotropy in the arrival directions of cosmic rays above 8 EeV. In this work, we explore whether resolved gamma-ray sources can reproduce the Auger dipole. We use various Fermi Large Area Telescope catalogs as sources of cosmic rays in CRPropa simulations. We find that in all cases, the simulated dipole has an amplitude significantly larger than that measured by Auger, even when considering large extragalactic magnetic field strengths and optimistic source weighting schemes. Our result implies that the resolved gamma-ray sources are insufficient to account for the population of sources producing the highest-energy cosmic rays, and there must exist a population of UHECR sources that lack gamma-ray emission or are unresolved by the current-generation gamma-ray telescopes.
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
—
Continuities
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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
Astrophysical Journal Letters
ISSN
2041-8205
e-ISSN
2041-8213
Volume of the periodical
967
Issue of the periodical within the volume
1
Country of publishing house
US - UNITED STATES
Number of pages
7
Pages from-to
L15
UT code for WoS article
001225007800001
EID of the result in the Scopus database
2-s2.0-85194040527