Karlsruhe 2024 – scientific programme

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T: Fachverband Teilchenphysik

T 60: Gamma astronomy 3

T 60.1: Talk

Wednesday, March 6, 2024, 16:00–16:15, Geb. 30.22: kl. HS A

Searching for photons beyond PeV energies from galactic sources — •Chiara Jane Papior, Markus Risse, and Marcus Niechciol — Universität Siegen, Siegen, Deutschland

Recently, observations of photons in the low PeV range originating from several galactic sources have been presented. Sources that are responsible for the emission of such energetic photons are candidates for cosmic-ray acceleration as well. Fits to the measured fluxes of the photon signals have been produced for many of the newly found sources. In this contribution, several sources with high photon fluxes at high energies are examined in detail. Their spectra are extrapolated beyond the PeV range to energies that might be accessible by present and future large-scale cosmic-ray observatories (i.e., beyond 10 PeV). Based on the continuation of these spectra and potential propagation effects, the expected photon flux is estimated for each source as a function of energy. The requirements for a detection of such photons with present and future observatories is discussed as well as prospects for actual observations.
This work is supported by the Deutsche Forschungsgemeinschaft (DFG).

Keywords: galactic PeVatron; PeV photon; UHE photon; shower arrays; photon discrimination