Multi-Messenger studies with the Pierre Auger Observatory

TL;DR

The Pierre Auger Observatory advances multi-messenger astrophysics by providing key data and limits on high-energy cosmic particles, and supports follow-up studies of gravitational wave events.

Contribution

This paper presents the Observatory's multi-messenger capabilities, recent results, and its role in multi-messenger astrophysics, highlighting new limits and follow-up strategies.

Findings

Stringent limits on photon fluxes at EeV energies

Effective neutrino detection and identification capabilities

Successful follow-up of gravitational wave events

Abstract

Over the past decade the multi-messenger astrophysics has emerged as a distinct discipline, providing unique insights into the properties of high-energy phenomena in the Universe. The Pierre Auger Observatory, located in Malarg\"ue, Argentina, is the world's largest cosmic ray detector sensitive to photons, neutrinos, and hadrons at ultra-high energies. Using its data, stringent limits on photon and neutrino fluxes at EeV energies have been obtained. The collaboration uses the excellent angular resolution and the neutrino identification capabilities of the Observatory for follow-up studies of events detected in gravitational waves or other messengers, through cooperation with global multi-messenger networks. We present a science motivation together with an overview of the multi-messenger capabilities and results of the Pierre Auger Observatory.