The Pierre Auger Observatory, which is the largest air-shower experiment in the world, offers
unprecedented exposure to neutral particles at the highest energies. Since the start of data …

The Pierre Auger Observatory, being the largest air-shower experiment in the world, offers
an unprecedented exposure to neutral particles at the highest energies. Since the beginning …

Data taken at the Pierre Auger Observatory are used to search for air showers initiated by
ultra-high energy (UHE) photons. Results of searches are reported from hybrid observations …

Photons are the main messenger particles for exploring the Universe. They are observed in
a broad energy range, spanning from the radio regime, through the visible light up to the X …

With the first gravitational waves (GWs) measured by the Advanced LIGO and Virgo
detectors in 2015 (Abbott et al. 2016), a new window to the universe has been opened. In …

Abstract The Pierre Auger Observatory is the most sensitive detector to primary photons with
energies above∼ 0.2 EeV. It measures extensive air showers using a hybrid technique that …

Abstract The Pierre Auger Observatory is the most sensitive detector to primary photons with
energies above∼ 0.2 EeV. It measures extensive air showers using a hybrid technique that …

The observation of photons with energies above 1018 eV would open a new window in
cosmic-ray research, with possible impact on astrophysics, particle physics, cosmology and …

Ultra-high energy (UHE) photons with energies around 1 EeV (1 EeV= 1018 eV) and
above have not yet been identified (see Bleve & Pierre Auger Collaboration 2015 and …

A search for ultra-high energy photons with energies above 1EeV is performed using nine
years of data collected by the Pierre Auger Observatory in hybrid operation mode. An …