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We present radio and X-ray studies of A3444 and MS1455.0+2232, two galaxyclusters with radio minihalos in their cool cores. A3444 is imaged using theGiant Metrewave Radio Telescope (GMRT) at 333, 607 and 1300 MHz and the VeryLarge Array at 1435 MHz. Most of the minihalo is contained within r<120 kpc,but a fainter extension, stretching out to 380 kpc South-West of the center, isdetected at 607 MHz. Using Chandra, we detect four X-ray sloshing cold fronts:three in the cool core at r=60, 120 and 230 kpc, and a fourth one at r=400 kpc- in the region of the southwestern radio extension - suggesting that theintracluster medium (ICM) is sloshing on a cluster-wide scale. The radioemission is contained within the envelope defined by these fronts. We alsoanalyzed archival 383 MHz GMRT and Chandra observations of MS1455.0+2232, whichexhibits a known minihalo with its bright part delineated by cold fronts insidethe cool core, but with a faint extension beyond the core. Similarly to A3444,we find a cold front at r~425 kpc, containing the radio emission. Thus theentire diffuse radio emission seen in these clusters appears to be related tolarge-scale sloshing of the ICM. The radio spectrum of the A3444 minihalo is apower law with a steep index $\alpha=1.0\pm0.1$. The spectrum steepens withincreasing distance from the center, as expected if the minihalo originatesfrom re-acceleration of relativistic particles by the sloshing-inducedturbulence in the ICM.

Are radio minihalos confined by cold fronts in galaxy clusters? Minihalos and large-scale sloshing in A3444 and MS 1455.0+2232