Honing cross-correlation tools for inference on ultra-high-energy cosmic-ray composition
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F24%3A00585271" target="_blank" >RIV/68378271:_____/24:00585271 - isvavai.cz</a>
Result on the web
<a href="https://hdl.handle.net/11104/0360130" target="_blank" >https://hdl.handle.net/11104/0360130</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1088/1475-7516/2024/03/058" target="_blank" >10.1088/1475-7516/2024/03/058</a>
Alternative languages
Result language
angličtina
Original language name
Honing cross-correlation tools for inference on ultra-high-energy cosmic-ray composition
Original language description
The chemical composition of the highest-energy cosmic rays, namely the atomic number Z of rays with energies E ≳ 40 EeV, remains to date largely unknown. Some information on the composition can be inferred from the deflections that charged ultra-high-energy cosmic rays experience while they traverse intervening magnetic fields. Indeed, such deflections distort and suppress the original anisotropy in the cosmic ray arrival directions, thus, given a source model, a measure of the anisotropy is also a measurement of the deflections, which in turn informs us on the chemical composition. In this work, we show that, by quantifying ultra-high-energy cosmic ray anisotropies through the angular cross-correlation between cosmic rays and galaxies, we would be able to exclude iron fractions fFe ≥ Script O(10%) assuming a fiducial hydrogen map at 2σ level, and even smaller fractions in the reverse case of hydrogen on an iron map, going well below fH ≈ 10% when we mask the Galactic Centre up to latitudes of 40°. This is an improvement of a factor of a few compared to our previous method, and is mostly ascribable to a new test statistics which is sensitive to each harmonic multipole individually. Our method can be applied to real data as an independent test of the recent claim that current cosmic-ray data can not be reproduced by any existing model of the Galactic magnetic field, as well as an additional handle to compare any realistic, competing, data-driven composition models.
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
10308 - Astronomy (including astrophysics,space science)
Result continuities
Project
<a href="/en/project/EF15_003%2F0000437" target="_blank" >EF15_003/0000437: Cosmology, Gravity and the Dark Sector of the Universe</a><br>
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
3
Country of publishing house
US - UNITED STATES
Number of pages
16
Pages from-to
058
UT code for WoS article
001195863300012
EID of the result in the Scopus database
2-s2.0-85188968369