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We report the first X-ray detection of a proto-supermassive binary black holeat the centre of Abell 400. Using the Chandra ACIS, we are able to clearlyresolve the two active galactic nuclei in 3C 75, the well known double radiosource at the centre of Abell 400. Through analysis of the new Chandraobservation of Abell 400 along with 4.5 GHz and 330 MHz VLA radio data, we willshow new evidence that the Active Galactic Nuclei in 3C 75 are a bound system.Methods. Using the high quality X-ray data, we map the temperature, pressure,density, and entropy of the inner regions as well as the cluster profileproperties out to ~18'. We compare features in the X-ray and radio images todetermine the interaction between the intra-cluster medium and extended radioemission. The Chandra image shows an elongation of the cluster gas along thenortheast-southwest axis; aligned with the initial bending of 3C 75's jets.Additionally, the temperature profile shows no cooling core, consistent with amerging system. There is an apparent shock to the south of the core consistentwith a Mach number of M~1.4 or speed of v~1200 km s^-1. Both Active GalacticNuclei, at least in projection, are located in the low entropy, high densitycore just north of the shock region. We find that the projected path of thejets does not follow the intra-cluster medium surface brightness gradient asexpected if their path were due to buoyancy. We also find that both central AGNare extended and include a thermal component. Based on this analysis, weconclude that the Active Galactic Nuclei in 3C 75 are a bound system from aprevious merger. They are contained in a low entropy core moving through theintra-cluster medium at 1200 km s^-1. The bending of the jets is due to thelocal intra-cluster medium wind.Comment: 16 pages, 14 figures, accepted for publication in A&

X-ray detection of the proto supermassive binary black hole at the centre of Abell 400