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We present new deep, high-resolution radio images of the diffuse minihalo inthe cool core of the galaxy cluster RX J1720.1+2638. The images have beenobtained with the Giant Metrewave Radio Telescope at 317, 617 and 1280 MHz andwith the Very Large Array at 1.5, 4.9 and 8.4 GHz, with angular resolutionsranging from 1" to 10". This represents the best radio spectral and imagingdataset for any minihalo. Most of the radio flux of the minihalo arises from abright central component with a maximum radius of ~80 kpc. A fainter tail ofemission extends out from the central component to form a spiral-shapedstructure with a length of ~230 kpc, seen at frequencies 1.5 GHz and below. Wefind indication of a possible steepening of the total radio spectrum of theminihalo at high frequencies. Furthermore, a spectral index image shows thatthe spectrum of the diffuse emission steepens with the increasing distancealong the tail. A striking spatial correlation is observed between the minihaloemission and two cold fronts visible in the Chandra X-ray image of this coolcore. These cold fronts confine the minihalo, as also seen in numericalsimulations of minihalo formation by sloshing-induced turbulence. All theseobservations favor the hypothesis that the radio emitting electrons in clustercool cores are produced by turbulent reacceleration.

Mapping the particle acceleration in the cool core of the galaxy cluster RX J1720.1+2638