Karlsruhe 2024 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 54: Cosmic rays 5
T 54.2: Vortrag
Mittwoch, 6. März 2024, 16:15–16:30, Geb. 20.30: 2.059
The Impact of the Temporal Luminosity Evolution on the Signal of Ultra-High-Energy Cosmic Rays — •Magdalena Litwin1,2, Björn Eichmann1,2, and Julia Becker Tjus1,2,3 — 1Theoretical Physics IV, Plasma Astroparticle Physics, Faculty for Physics and Astronomy, Ruhr University Bochum, 44780 Bochum, Germany — 2Ruhr Astroparticle and Plasma Physics Center (RAPP Center), Germany — 3Department of Space, Earth and Environment, Chalmers University of Technology, 412 96 Gothenburg, Sweden
While the origin of cosmic rays at the highest energies remains unclear to date, nearby radio galaxies are considered as potential candidates. Limiting the sources of ultra-high-energy cosmic rays (UHECR) to such a small number, their finite lifetime would have a significant impact on the resulting energy spectrum and mass composition at Earth. This is due to the so-called magnetic horizon effect that yields hard spectra of the individual CR nuclei. In this work, we illustrate this effect and examine its influence by an analysis of different potential source luminosity evolutions. The results demonstrate a good agreement with the experimental data, if the sources have shown an increased luminosity in the past according to either a normal or log-normal evolution.
Keywords: cosmic rays; radio galaxies; finite lifetime; luminosity evolutions