Multi-messenger Astrophysics with the Pierre Auger Observatory

TL;DR

The Pierre Auger Observatory plays a key role in multi-messenger astrophysics by conducting diverse searches for cosmic particles and signals in coordination with other observatories, enhancing understanding of high-energy cosmic phenomena.

Contribution

This paper provides an overview of the multi-messenger search activities of the Pierre Auger Observatory, highlighting new coordinated detection efforts and results.

Findings

Detection of ultra-high energy photons and neutrinos in coincidence with gravitational waves.

Correlations between UHECRs and high-energy neutrinos from IceCube and ANTARES.

Successful multi-messenger campaigns like 'Deeper, Wider, Faster'.

Abstract

While the Pierre Auger Observatory is a very successful instrument for ultra-high energy cosmic ray (UHECR) detection, it is increasingly used as part of various types of multi-messenger searches, in which it contributes with searches for air showers induced by atomic nuclei, neutrons, photons, and neutrinos. We present an overview of the multi-messenger activities of the Pierre Auger Observatory. The overview includes: searches for ultra-high energy photons and neutrinos detected by the Pierre Auger Observatory in coincidence with gravitational wave events detected by LIGO and Virgo; searches for correlations of the arrival directions of UHECRs detected by the Pierre Auger Observatory and high-energy neutrinos detected by IceCube and ANTARES; searches for Galactic neutrons; the multi-messenger campaign "Deeper, Wider, Faster", aiming for common observations of a variety of complementary instruments. We discuss the methods and results of these searches.