Comment on "A snapshot of the oldest AGN feedback phases"

TL;DR

This paper challenges recent claims by demonstrating through simulations that mixing, rather than other processes, is the primary heating mechanism in the intragroup medium of a specific galaxy group, based on radio observations.

Contribution

It provides a counter-argument to recent findings by using hydrodynamical simulations to support mixing as the main heating process in galaxy groups.

Findings

Radio filament morphology matches simulation predictions

Mixing is identified as the dominant heating process

Supports previous simulation-based conclusions

Abstract

We dispute a very recent claim, which is based on new LOFAR radio observations, that mixing does not heat the intragroup medium of the galaxy group Nest200047. We argue to the contrary, namely, that the main heating process is mixing, by showing that the radio morphology of filaments in this galaxy group was qualitatively reproduced by a past three-dimensional hydrodynamical simulation that also showed that the main heating process is by mixing of hot gas from the jet-inflated bubbles with the intracluster (or intragroup) medium.