At the faint end of the deepest X-ray surveys, a population of X-ray luminous galaxies is seen. We present the results of a cross-correlation between the residual, unresolved X-ray photons in a very deep X-ray survey and the positions of faint galaxies, in order to examine the importance of these objects at even fainter flux levels. We find a significant correlation on all angular scales up to ~1 arcmin.

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