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We present a galaxy group catalogue spanning the redshift range 0.1 <~ z <~ 1in the ~1.7 deg^2 COSMOS field, based on the first ~10,000 zCOSMOS spectra. Theperformance of both the Friends-of-Friends (FOF) and Voronoi-Delaunay-Method(VDM) approaches to group identification has been extensively explored andcompared using realistic mock catalogues. We find that the performance improvessubstantially if groups are found by progressively optimizing the group-findingparameters for successively smaller groups, and that the highest fidelitycatalogue, in terms of completeness and purity, is obtained by combining theindependently created FOF and VDM catalogues. The final completeness and purityof this catalogue, both in terms of the groups and of individual members,compares favorably with recent results in the literature. The current groupcatalogue contains 102 groups with N >= 5 spectroscopically confirmed members,with a further ~700 groups with 2 <= N <= 4. Most of the groups can be assigneda velocity dispersion and a dark-matter mass derived from the mock catalogues,with quantifiable uncertainties. The fraction of zCOSMOS galaxies in groups isabout 25% at low redshift and decreases toward ~15% at z ~ 0.8. The zCOSMOSgroup catalogue is broadly consistent with that expected from the semi-analyticevolution model underlying the mock catalogues. Not least, we show that thenumber density of groups with a given intrinsic richness increases fromredshift z ~ 0.8 to the present, consistent with the hierarchical growth ofstructure.

An optical group catalogue to z = 1 from the zCOSMOS 10k sample