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 × 10^17 eV using about 5.5 yr 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.
A Search for Photons with Energies above 2 × 10^17eV Using Hybrid Data from the Low-Energy Extensions of the Pierre Auger Observatory
De Palma F.;De Vito E.;Epicoco I.;Mancarella G.;Martello D.;Nucita A.;Perrone L.;Savina P.;Scherini V.;
2022-01-01
Abstract
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 × 10^17 eV using about 5.5 yr 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.File | Dimensione | Formato | |
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