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