A search for photons with energies above 2x10^{17} eV using hybrid data from the low-energy extensions of the Pierre Auger Observatory

THE PIERRE AUGER COLLABORATION.; S. J. SCIUTTO

ASTROPHYSICAL JOURNAL

IOP PUBLISHING LTD

Lugar: Londres; Año: 2022 vol. 933

0004-637X

Ultra-high-energy photons with energies exceeding 1017 eV offer a wealth of connections to different aspects ofcosmic-ray astrophysics as well as to gamma-ray and neutrino astronomy. The recent observations of photons withenergies in the 1015 eV range further motivate searches for even higher-energy photons. In this paper, we present asearch for photons with energies exceeding 2 × 1017 eV using about 5.5 yr of hybrid data from the low-energyextensions of the Pierre Auger Observatory. The upper limits on the integral photon flux derived here are the moststringent ones to date in the energy region between 1017 and 1018 eV.