The H.E.S.S. multi-messenger program

TL;DR

The H.E.S.S. multi-messenger program combines high-energy neutrino and gamma-ray observations, along with gravitational wave and Fast Radio Burst triggers, to enhance the detection and understanding of cosmic high-energy phenomena.

Contribution

This paper introduces the H.E.S.S. multi-messenger program, highlighting its novel integration of neutrino, gamma-ray, gravitational wave, and FRB observations for astrophysical research.

Findings

Detection of gamma-ray emission following gravitational wave events

Extended search for gamma-ray signals from Fast Radio Bursts

Current and planned analyses with recent results

Abstract

Based on fundamental particle physics processes like the production and subsequent decay of pions in interactions of high-energy particles, close connections exist between the acceleration sites of high-energy cosmic rays and the emission of high-energy gamma rays and high-energy neutrinos. In most cases these connections provide both spatial and temporal correlations of the different emitted particles. The combination of the complementary information provided by these messengers allows to lift ambiguities in the interpretation of the data and enables novel and highly sensitive analyses. In this contribution the H.E.S.S. multi-messenger program is introduced and described. The current core of this newly installed program is the combination of high-energy neutrinos and high-energy gamma rays. The search for gamma-ray emission following gravitational wave triggers is also discussed. Furthermore, the existing program for following triggers in the electromagnetic regime was extended by the search for gamma-ray emission from Fast Radio Bursts (FRBs). An overview over current and planned analyses is given and recent results are presented.