We present and test a new halo finder based on the spherical overdensity (SO)method. This new adaptive spherical overdensity halo finder (ASOHF) is able toidentify dark matter haloes and their substructures (subhaloes) down to thescales allowed by the analysed simulations. The code has been especiallydesigned for the adaptive mesh refinement cosmological codes, although it canbe used as a stand-alone halo finder for N-body codes. It has been optimisedfor the purpose of building the merger tree of the haloes. In order to verifythe viability of this new tool, we have developed a set of bed tests thatallows us to estimate the performance of the finder. Finally, we apply the halofinder to a cosmological simulation and compare the results obtained to thosegiven by other well known publicly available halo finders.
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