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The core of the relaxed cluster AWM 4 is characterized by a uniquecombination of properties which defy a popular scenario for ANG heating ofcluster cores. A flat inner temperature profile is indicative of a past, majorheating episode which completely erased the cool core, as testified by the highcentral cooling time (~ 3 Gyr) and by the high central entropy level (~ 60 keVcm^2). Yet the presence of a 1.4 GHz active central radio galaxy with extendedradio lobes out to 100 kpc, reveals recent feeding of the central massive blackhole. A system like AWM 4 should have no radio emission at all if only feedbackfrom the cooling hot gas regulates the AGN activity.

Trouble for AGN Feedback ? The puzzle of the core of the Galaxy Cluster AWM 4