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T: Fachverband Teilchenphysik

T 54: Cosmic rays 5

T 54.4: Vortrag

Mittwoch, 6. März 2024, 16:45–17:00, Geb. 20.30: 2.059

The ABC of UHECR source searches: Charting cosmic paths with Bayesian statistics — •Nadine Bourriche and Francesca Capel — Max Planck Institute for Physics, Garching bei München, Germany

UHECRs at the most extreme energies provide strong constraints on their possible sources. We propose to use the reconstructed properties of individual detected UHECRs to map out three-dimensional constraints on the locations of their unknown sources. In this work, we focus on the Amaterasu particle detected by Telescope Array and use CRPropa 3 to model all relevant propagation effects, including de ections in the Galactic and extra-Galactic magnetic fields. We consider key input quantities such as distance, position, and spectral index as free parameters. We use Approximate Bayesian Computation (ABC) to derive constraints on the source location and demonstrate the impact of uncertainties in the reconstructed UHECR properties on these results. We also highlight possible astrophysical sources that are compatible with these regions and requirements. This complementary perspective serves as a foundation for building more physically-motivated source catalogues and statistical analyses in the future.

Keywords: UHECR; Analysis; Bayesian statistics; Astrophysical sources