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We present the results of an Australia Telescope Compact Array 1.4 GHzspectropolarimetric aperture synthesis survey of 34 square degrees centred onCentaurus A - NGC 5128. A catalogue of 1005 extragalactic compact radio sourcesin the field to a continuum flux density of 3 mJy/beam is provided along with atable of Faraday rotation measures (RMs) and linear polarised intensities forthe 28 percent of sources with high signal-to-noise in linear polarisation. Weuse the ensemble of 281 background polarised sources as line-of-sight probes ofthe structure of the giant radio lobes of Centaurus A. This is the first timesuch a method has been applied to radio galaxy lobes and we explain how itdiffers from the conventional methods that are often complicated by depth andbeam depolarisation effects. We use an RM structure function analysis andreport the detection of a turbulent RM signal, with rms of 17 rad/m^2 and scalesize 0.3 degrees, associated with the southern giant lobe. We cannot verifywhether this signal arises from turbulent structure throughout the lobe or onlyin a thin skin (or sheath) around the edge, although we favour the latter. TheRM signal is modelled as possibly arising from a thin skin with a thermalplasma density equivalent to the Centaurus intragroup medium density and acoherent magnetic field that reverses its sign on a spatial scale of 20 kpc.

Faraday Rotation Structure on Kiloparsec Scales in the Giant Radio Lobes of Centaurus A