There are two popular explanations of the mechanisms that prevent the central ICM from cooling: feedback from active galactic nuclei through injection of relativistic jets of plasma and sloshing of the ICM plasma during mergers with subclusters.
Two key explanations for why the central Intracluster Medium (ICM) doesn't cool down are: feedback from active galactic nuclei through relativistic jets of plasma injection and the sloshing of the ICM plasma during mergers with subclusters.