14–24 Jul 2025
CICG - International Conference Centre - Geneva, Switzerland
Europe/Zurich timezone
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Lensing effects of ultra-high-energy cosmic rays propagating in Galactic magnetic fields

21 Jul 2025, 14:35
15m
CICG - International Conference Centre - Geneva, Switzerland

CICG - International Conference Centre - Geneva, Switzerland

17 rue de Varembé CH - 1211 Geneva Switzerland
Talk Cosmic-Ray Indirect CRI

Speaker

Dr Danelise de Oliveira Franco (II. Institute for Theoretical Physics, Universität Hamburg)

Description

Most ultra-high-energy cosmic rays (UHECRs) are charged particles. As a result, they are deflected by magnetic fields, which can act as lenses, altering their trajectories and (de)magnifying their apparent sources. In this study, we investigate the influence of Galactic magnetic fields on the propagation of UHECRs. The deflections of UHECR trajectories can lead to phenomena such as the appearance of multiple images of a source and modifications in its observed energy spectrum. Using realistic models of Galactic magnetic fields, such as the $\texttt{JF12}$ (Jansson and Farrar) and $\texttt{KST24}$ (Korochkin, Semikoz, and Tinyakov) models, we analyze the (de)magnification effects over a rigidity range from 1$\,\mathrm{EV}$ ($\equiv 10^{18}\,\mathrm{V}$) to 100$\,\mathrm{EV}$, and study their dependence on the chosen model. Since the deflections induced by the magnetic fields depend on the particle's rigidity, their effect varies among different nuclear species. Consequently, our findings can have implications for interpreting mass-composition and anisotropy observations, as the rigidity-dependent deflections directly alter the observed UHECR arrival direction distribution.

Authors

Dr Danelise de Oliveira Franco (II. Institute for Theoretical Physics, Universität Hamburg) Guenter Sigl (II. Institute for Theoretical Physics, Universität Hamburg)

Presentation materials

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