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T: Fachverband Teilchenphysik

T 57: Gamma Astronomy I

T 57.5: Vortrag

Mittwoch, 2. April 2025, 17:15–17:30, VG 3.101

Towards Searching for Photons with Energies beyond the PeV Range from Galactic PeVatrons — •Chiara Papior, Marcus Niechciol, and Markus Risse — Experimentelle Astroteilchenphysik, Center for Particle Physics Siegen, Universität Siegen

Recently, photons of cosmic origin with energies in the PeV range have been measured by several gamma-ray observatories. Such energetic photons are potentially produced during the acceleration of charged particles in so-called PeVatrons which are widely assumed to be the sources of a large part of galactic cosmic rays. The LHAASO and HAWC observatories published catalogs of gamma-ray sources including sources with energy spectra without visible cutoffs up to the PeV range. Several of those sources have been selected and their spectra have been extrapolated up to the ultra-high-energy (UHE, here beyond 10 PeV) regime. It has been evaluated if (and under which conditions) giant air-shower observatories, for example the Pierre Auger Observatory, could contribute to testing the UHE luminosity of such PeV γ-sources. The expected fluxes and the required discrimination power to distinguish between photon- and hadron-initiated air showers will be presented. The impact of possible propagation effects is investigated as well.
This work is supported by the German Research Foundation (DFG, Project No. 508269468).

Keywords: UHE Photons; Galactic PeVatrons