Gamma-ray emission associated with the Cluster-scale AGN Outbursts in the Hydra A system

TL;DR

This paper investigates gamma-ray emissions resulting from cosmic-ray protons in the cavities created by a powerful AGN outburst in the Hydra A galaxy cluster, suggesting potential detectability with H.E.S.S.

Contribution

It proposes that cosmic-ray protons in AGN-inflated cavities produce detectable gamma-rays via pi^0 decay, linking AGN activity to gamma-ray signals.

Findings

Gamma-ray emissions from cosmic-ray protons are potentially detectable with H.E.S.S.

Cavities in Hydra A are likely filled with high-energy protons and nuclei.

The model aligns with observed cavity structures and predicts observable gamma-ray fluxes.

Abstract

Recent observations have revealed the existence of an enormously energetic > 10^61 erg AGN outburst in the Hydra A cluster of galaxies. This outburst has produced cavities in the intra-cluster medium, apparently supported by pressure from cosmic rays. Here we argue that if these cavities are filled with > GeV particles, these particles are very likely protons and nuclei. For a plausible spatial distribution of the target gas, based on observations and hydrodynamical simulations, we show that the pi^0-decay gamma-rays from these cosmic-rays may be detectable with the H.E.S.S.experiment.