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We present LOFAR data from 110--180~MHz of the merging galaxy cluster Abell1682, alongside archival optical, radio and X-ray data. Our 6 arc-secondresolution images at low frequencies reveal new structures associated withnumerous radio galaxies in the cluster. At 20 arc-second resolution we seediffuse emission throughout the cluster over hundreds of kpc, indicatingparticle acceleration mechanisms are in play as a result of the cluster mergerevent and powerful active galactic nuclei. We show that a significant part ofthe cluster emission is from an old radio galaxy with very steep spectrumemission (having a spectral index of $\alpha < -2.5$). Furthermore we identifya new region of diffuse steep spectrum emission ($\alpha < -1.1$) as acandidate for a radio halo which is co-spatial with the centre of the clustermerger. We suggest its origin as a population of old and mildly relativisticelectrons left over from radio galaxies throughout the cluster which have beenre-accelerated to higher energies by shocks and turbulence induced by thecluster merger event. We also note the discovery of six new giant radiogalaxies in the vicinity of Abell 1682.

Signatures from a merging galaxy cluster and its AGN population: LOFAR observations of Abell 1682