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Galaxy clusters with signs for a recent merger show in many cases extendeddiffuse radio features. This emission originates from relativistic electronswhich suffer synchrotron losses due to the intra-cluster magnetic field. Themechanisms of the particle acceleration and the properties of the magneticfield are still poorly understood. We search for diffuse radio emission ingalaxy clusters. Here, we study the complex galaxy cluster Abell 2069, forwhich X-ray observations indicate a recent merger. We investigate the cluster'sradio continuum emission by deep Westerbork Synthesis Radio Telescope (WSRT)observations at 346 MHz and a Giant Metrewave Radio Telescope (GMRT)observation at 322 MHz. We find an extended diffuse radio feature roughlycoinciding with the main component of the cluster. We classify this emission asa radio halo and estimate its lower limit flux density to 25 +/- 9 mJy.Moreover, we find a second extended diffuse source located at the cluster'scompanion and estimate its flux density to 15 +/- 2 mJy. We speculate that thisis a small halo or a mini-halo. If true, this cluster is the first example of adouble-halo in a single galaxy cluster.

Diffuse radio emission in the complex merging galaxy cluster Abell 2069