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Collisions between galaxy clusters dissipate enormous amounts of energy inthe intra-cluster medium (ICM) through turbulence and shocks. In the process,Mpc-scale diffuse synchrotron emission in form of radio halos and relics canform. However, little is known about the very early phase of the collision. Weused deep radio observations from 53 MHz to 1.5 GHz to study the pre-merginggalaxy clusters A1758N and A1758S that are $\sim2$ Mpc apart. We confirm thepresence of a giant bridge of radio emission connecting the two systems thatwas reported only tentatively in our earlier work. This is the secondlarge-scale radio bridge observed to date in a cluster pair. The bridge isclearly visible in the LOFAR image at 144 MHz and tentatively detected at 53MHz. Its mean radio emissivity is more than one order of magnitude lower thanthat of the radio halos in A1758N and A1758S. Interestingly, the radio andX-ray emissions of the bridge are correlated. Our results indicate thatnon-thermal phenomena in the ICM can be generated also in the region ofcompressed gas in-between infalling systems.

A giant radio bridge connecting two clusters in Abell 1758