arxiv: 2205.14864 · v1 · ★pith:UIVE26G7new · submitted 2022-05-30 · 🌌 astro-ph.HE
A search for photons with energies above 2{times}10¹⁷ eV using hybrid data from the low-energy extensions of the Pierre Auger Observatory
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Ultra-high-energy photons with energies exceeding $10^{17}$ eV offer a wealth of connections to different aspects of cosmic-ray astrophysics as well as to gamma-ray and neutrino astronomy. The recent observations of photons with energies in the $10^{15}$ eV range further motivate searches for even higher-energy photons. In this paper, we present a search for photons with energies exceeding $2{\times}10^{17}$ eV using about 5.5 years of hybrid data from the low-energy extensions of the Pierre Auger Observatory. The upper limits on the integral photon flux derived here are the most stringent ones to date in the energy region between $10^{17}$ and $10^{18}$ eV.
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