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We present new X-ray (Chandra) and radio (JVLA) observations of the nearbycluster Abell 3744. It hosts two prominent radio galaxies with powers in therange critical for radio-mode feedback. The radio emission from these galaxiesterminates in buoyant tendrils reaching the cluster's outer edge, and theradio-emitting plasma clearly influences the cluster's X-ray-emittingatmosphere. The cluster's average gas temperature, of kT=3.5 keV, is high forits bolometric luminosity of 3.2 \times 10^{43} ergs s^{-1}, but the 100kpc-scale cavity carved out by radio-emitting plasma shows evidence of lessthan 2 per cent of the excess enthalpy. We suggest instead that a high-velocityencounter with a galaxy group is responsible for dispersing and increasing theentropy of the gas in this non-cool-core cluster. We see no evidence forshocks, or established isobaric gas motions (sloshing), but there is muchsub-structure associated with a dynamically active central region thatencompasses the brightest radio emission. Gas heating is evident in directionsperpendicular to the inferred line of encounter between the infalling group andcluster. The radio-emitting tendrils run along boundaries between gas ofdifferent temperature, apparently lubricating the gas flows and inhibiting heattransfer. The first stages of the encounter may have helped trigger the radiogalaxies into their current phase of activity, where we see X-rays from thenuclei, jets, and hotspots.

Sliding not sloshing in Abell 3744: the influence of radio galaxies NGC 7018 and 7016 on cluster gas