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We evaluate the construction methodology of an all-sky catalogue of galaxyclusters detected through the Sunyaev-Zel'dovich (SZ) effect. We perform anextensive comparison of twelve algorithms applied to the same detailedsimulations of the millimeter and submillimeter sky based on a Planck-likecase. We present the results of this "SZ Challenge" in terms of cataloguecompleteness, purity, astrometric and photometric reconstruction. Our resultsprovide a comparison of a representative sample of SZ detection algorithms andhighlight important issues in their application. In our study case, we showthat the exact expected number of clusters remains uncertain (about a thousandcluster candidates at |b|> 20 deg with 90% purity) and that it depends on theSZ model and on the detailed sky simulations, and on algorithmic implementationof the detection methods. We also estimate the astrometric precision of thecluster candidates which is found of the order of ~2 arcmins on average, andthe photometric uncertainty of order ~30%, depending on flux.

A Comparison of Algorithms for the Construction of SZ Cluster Catalogues