On the origin of ultra-high-energy cosmic rays assuming a heavy mass composition

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F25%3A00644565" target="_blank" >RIV/68378271:_____/25:00644565 - isvavai.cz</a>
Result on the web
<a href="https://pos.sissa.it/501/179/pdf" target="_blank" >https://pos.sissa.it/501/179/pdf</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.22323/1.501.0179" target="_blank" >10.22323/1.501.0179</a>

Result language
angličtina
Original language name
On the origin of ultra-high-energy cosmic rays assuming a heavy mass composition
Original language description
Recent studies, supported by updated hadronic interaction models, suggest that the mass composition of ultra-high-energy cosmic rays may be heavier than previously assumed. This has significant implications for source identification, as the deflections of the Galactic magnetic field (GMF) are larger for heavy primaries than for lighter ones at the same energy. In this work, we assume that cosmic rays above 40~EeV consist of iron nuclei only and investigate their possible sources through simulations of cosmic ray propagation, including interactions with ambient photon fields and deflections in the GMF using multiple models. We consider two types of sources as potential origins of these cosmic rays, active galactic nuclei and starburst galaxies. We compare the predicted distributions of arrival directions from sources within 250~Mpc with the measured arrival directions of cosmic rays above 40~EeV. Our results indicate that stronger correlation is found for the active galactic nuclei scenario compared to starburst galaxies. However, we find that within our heavy mass composition model, the GMF leads to significant deflections, making source identification challenging with current knowledge and tools, even at the highest energies.
Czech name
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Czech description
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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