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We report the discovery of large-scale diffuse radio emission South-East ofthe galaxy cluster MACS J0520.7-1328, detected through high sensitivity GiantMetrewave Radio Telescope 323 MHz observations. This emission is dominated byan elongated diffuse radio source and surrounded by other features of lowersurface brightness. Patches of these faint sources are marginally detected in a1.4 GHz image obtained through a re-analysis of archival NVSS data.Interestingly, the elongated radio source coincides with a previouslyunclassified extended X-ray source. We perform a multi-wavelength analysisbased on archival infrared, optical and X-ray Chandra data. We find that thissource is a low-temperature (~3.6 keV) cluster of galaxies, with indications ofa disturbed dynamical state, located at a redshift that is consistent with theone of the main galaxy cluster MACS J0520.7-132 (z=0.336). We suggest that thediffuse radio emission is associated with the non-thermal components in theintracluster and intergalactic medium in and around the newly detected cluster.We are planning deeper multi-wavelength and multi-frequency radio observationsto accurately investigate the dynamical scenario of the two clusters and toaddress more precisely the nature of the complex radio emission.

Discovery of large-scale diffuse radio emission and of a new galaxy cluster in the surroundings of MACSJ0520.7-1328