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Galaxy clusters have been found to host a range of diffuse, non-thermalemission components, generally with steep, power law spectra. In this work wereport on the detection and follow-up of radio halos, relics, remnant radiogalaxies, and other fossil radio plasmas in Southern Sky galaxy clusters usingthe Murchison Widefield Array and the Australian Square Kilometre ArrayPathfinder. We make use of the frequency coverage between the two radiointerferometers - from 88 to $\sim 900$ MHz - to characterise the integratedspectra of these sources within this frequency range. Highlights from thesample include the detection of a double relic system in Abell 3186, amini-halo in RXC J0137.2-0912, a candidate halo and relic in Abell 3399, and acomplex multi-episodic head-tail radio galaxy in Abell 3164. We compare thisselection of sources and candidates to the literature sample, finding sourcesconsistent with established radio power-cluster mass scaling relations.Finally, we use the low-frequency integrated spectral index, $\alpha$ ($S_\nu\propto \nu^\alpha$), of the detected sample of cluster remnants and fossilsources to compare with samples of known halos, relics, remnants and fossils toinvestigate a possible link between their electron populations. We find thedistributions of $\alpha$ to be consistent with relic and halo emissiongenerated by seed electrons that originated in fossil or remnant sources.However, the present sample sizes are insufficient to rule out other scenarios.

Low-frequency integrated radio spectra of diffuse, steep-spectrum sources in galaxy clusters: palaeontology with the MWA and ASKAP