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Description
The Pierre Auger Observatory is the world’s largest experiment for the detection of ultra-high-energy (UHE) air showers, produced by particles with energies above ~
Neutrinos and photons can be identified by looking at the longitudinal development and particle content of air showers. Besides, any kind of neutral particles, being undeflected by magnetic fields, can be identified by searching for a flux excess from a given direction. This technique has been successfully used e.g. to set the upper limits on the flux of Galactic neutrons.
Thanks to its discrimination capabilities, the Observatory provides some of the most stringent upper bounds at UHEs to the diffuse photon and neutrino fluxes and to the neutrino flux from point-like steady sources. In addition, upper limits to UHE neutrinos and photons coming from compact binary mergers has also been provided by the follow-up of gravitational waves detected by LIGO and Virgo. The capabilities of the Pierre Auger Observatory as a powerful multi-messenger observatory are also expected to further increase in the next future thanks to the on-going upgrade to AugerPrime.
