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We present a combined radio, X-ray and optical study of the galaxy clusterRXCJ2003.5-2323. The cluster hosts one of the largest, most powerful anddistant giant radio halos known to date, suggesting that it may be undergoing astrong merger process. The aim of our multiwavelength study is to investigatethe radio-halo cluster merger scenario. We studied the radio properties of thegiant radio halo in RXCJ2003.5-2323 by means of new radio data obtained at 1.4GHz with the Very Large Array, and at 240 MHz with the Giant Metrewave RadioTelescope, in combination with previously published GMRT data at 610 MHz. Thedynamical state of the cluster was investigated by means of X-ray Chandraobservations and optical ESO--NTT observations. Our study confirms thatRXCJ2003.5-2323 is an unrelaxed cluster. The unusual filamentary and clumpymorphology of the radio halo could be due to a combination of the filamentarystructure of the magnetic field and turbulence in the inital stage of a clustermerger.

Testing the radio halo-cluster merger scenario. The case of RXCJ2003.5-2323