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The largest galaxy clusters are observed still to be forming through majorcluster-cluster mergers, often showing observational signatures such as radiorelics and giant radio haloes. Using LOFAR Two-meter Sky Survey data, wepresent new detections of both a radio halo (with a spectral index of$\alpha_{143}^{1400}=1.48^{+0.06}_{-0.23}$) and a likely radio relic in Abell959, a massive cluster at a redshift of z=0.288. Using a sample of clusterswith giant radio haloes from the literature (80 in total), we show that theradio halo in A959 lies reasonably well on the scaling relations between thethermal and non-thermal power of the system. Additionally, we find evidencethat steep-spectrum haloes tend to reside in clusters with high X-rayluminosities relative to those expected from cluster LM scaling relations,indicating that such systems may preferentially lie at an earlier stage of themerger, consistent with the theory that some steep-spectrum haloes result fromlow-turbulence mergers. Lastly, we find that halo systems containing radiorelics tend to lie at lower X-ray luminosities, relative to those expected fromcluster LM scaling relations, for a given halo radio power than those withoutrelics, suggesting that the presence of relics indicates a later stage of themerger, in line with simulations.

A Massive Cluster at z = 0.288 Caught in the Process of Formation: The Case of Abell 959