Göttingen 2025 – scientific programme

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T: Fachverband Teilchenphysik

T 37: Cosmic Rays II

T 37.6: Talk

Tuesday, April 1, 2025, 17:30–17:45, VG 3.102

Investigating the Expected Flux of GZK Photons — •Chiara Papior, Marcus Niechciol, and Markus Risse — Experimentelle Astroteilchenphysik, Center for Particle Physics Siegen, Universität Siegen

It is expected that charged cosmic rays produce ultra-high-energy (UHE, here beyond 10 PeV) photons during their propagation over extragalactic distances via photo-pion production with the cosmic microwave background. This effect is also known as the Greisen-Zatsepin-Kuzmin (GZK) effect and the photons produced via this interaction are termed GZK photons. The flux of GZK photons depends on the parameters of the emitted cosmic-ray spectrum such as the spectral index or a potential cutoff, as well as other parameters depending on the sources, including their distances, and the composition of the cosmic rays themselves. Simulations based on different input parameters have been performed, and the expected GZK photon flux will be presented. The goal is to update the allowed range of the expected GZK photon flux based on current measurements of cosmic-ray observatories at ultra-high-energy.
This work is supported by the German Research Foundation (DFG, Project No. 508269468).

Keywords: UHE Photons; GZK Effect; Photo-Pion Production