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We present a method for populating dark matter simulations with haloes ofmass below the resolution limit. It is based on stochastically sampling a fieldderived from the density field of the halo catalogue, using constraints fromthe conditional halo mass function n(m|{\delta}). We test the accuracy of themethod and show its application in the context of building mock galaxy samples.We find that this technique allows precise reproduction of the two-pointstatistics of galaxies in mock samples constructed with this method. Ourresults demonstrate that the full information content of a simulation can becommunicated efficiently using only a catalogue of the more massive haloes.

Reconstructing the distribution of haloes and mock galaxies below the resolution limit in cosmological simulations