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We present a detailed analysis of the radio galaxy PKS 2250-351, a giant of1.2 Mpc projected size, its host galaxy, and its environment. We use radio datafrom the Murchison Widefield Array, the upgraded Giant Metre-wavelength RadioTelescope, the Australian Square Kilometre Array Pathfinder, and the AustraliaTelescope Compact Array to model the jet power and age. Optical and infra-reddata come from the Galaxy And Mass Assembly (GAMA) survey and provideinformation on the host galaxy and environment. GAMA spectroscopy confirms thatPKS 2250-351 lies at z=0.2115 in the irregular, and likely unrelaxed, clusterAbell 3936. We find its host is a massive, `red and dead' elliptical galaxywith negligible star formation but with a highly obscured active galacticnucleus dominating the mid-infrared emission. Assuming it lies on the localM-sigma relation it has an Eddington accretion rate of lambda_EDD~0.014. Wefind that the lobe-derived jet power (a time-averaged measure) is an order ofmagnitude greater than the hotspot-derived jet power (an instantaneousmeasure). We propose that over the lifetime of the observed radio emission(~300 Myr) the accretion has switched from an inefficient advection dominatedmode to a thin-disc efficient mode, consistent with the decrease in jet power.We also suggest that the asymmetric radio morphology is due to its environment,with the host of PKS 2250-351 lying to the west of the densest concentration ofgalaxies in Abell 3936.

PKS 2250$-$351: A Giant Radio Galaxy in Abell 3936