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We present an analysis of the spatial and chemical sub-structures in a remotehalo field in the nearby giant elliptical galaxy Centaurus A (NGC~5128),situated at about 38 kpc from the centre of the galaxy. The observations weretaken with the Advanced Camera for Surveys instrument on board the Hubble SpaceTelescope, and reach down to the horizontal branch. In this relatively small3.8 kpc by 3.8 kpc field, after correcting for Poisson noise, we do not findany statistically strong evidence for the presence of small-scalesub-structures in the stellar spatial distribution on scales greater than 100pc. However, we do detect the presence of significant small spatial-scaleinhomogeneities in the stellar median metallicity over the surveyed field. Weargue that these localized chemical substructures could be associated withnot-fully mixed debris from the disruption of low mass systems. NGC 5128 joinsthe ranks of the late-type spiral galaxies the Milky Way, for which the stellarhalo appears to be dominated by small-scale spatial sub-structures, andNGC~891, where localized metallicity variations have been detected in the innerextra-planar regions. This suggests that the presence of small-scalesub-structures may be a generic property of stellar halos of large galaxies.

Are small-scale sub-structures a universal property of galaxy halos? The case of the giant elliptical NGC~5128