Constraining ultra-high-energy cosmic ray composition through cross-correlations

0567331 - FZÚ 2023 RIV GB eng J - Článek v odborném periodiku
Tanidis, Konstantinos - Urban, Federico - Camera, S.
Constraining ultra-high-energy cosmic ray composition through cross-correlations.
Journal of Cosmology and Astroparticle Physics. Roč. 2022, č. 12 (2022), č. článku 003. ISSN 1475-7516. E-ISSN 1475-7516
Institucionální podpora: RVO:68378271
Klíčová slova: ultra high energy cosmic rays * galactic magnetic fields * galaxy clustering
Obor OECD: Particles and field physics
Impakt faktor: 6.3, rok: 2022
Způsob publikování: Omezený přístup
https://doi.org/10.1088/1475-7516/2022/12/003

The chemical composition of the highest end of the ultra-high-energy cosmic ray spectrum is very hard to measure experimentally, and to this day it remains mostly unknown. Since the trajectories of ultra-high-energy cosmic rays are deflected in the magnetic field of the Galaxy by an angle that depends on their atomic number Z, it could be possible to indirectly measure Z by quantifying the amount of such magnetic deflections. In this paper we show that, using the angular harmonic cross-correlation between ultra-high-energy cosmic rays and galaxies, we could effectively distinguish different atomic numbers with current data. As an example, we show how, if Z = 1, the cross-correlation can exclude a 39% fraction of Fe56 nuclei at 2σ for rays above 100 EeV.
Trvalý link: https://hdl.handle.net/11104/0338592