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Published online by Cambridge University Press: 14 August 2015
From a comparison of X-ray and radio data for 20 clusters which contain tailed radio galaxies, we find evidence for the effects of buoyant forces on the low brightness parts of radio tails. In several cases, the width of the tail increases markedly in low gas density regions, strengthening the case for thermal gas confinement of radio tails. Three examples of enhanced X-ray emission around radio galaxies which are further than 2 Mpc from their cluster centers are found.