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The mass function of galaxy clusters is an important cosmological probe.Differences in the selection method could potentially lead to biases whendetermining the mass function. From the optical and X-ray data of theXMM-Newton Follow-Up Survey, we obtained a sample of galaxy cluster candidatesusing weak gravitational lensing, the optical Postman matched filter method,and a search for extended X-ray sources. We developed our weak-lensing searchcriteria by testing the performance of the aperture mass statistic on realisticray-tracing simulations matching our survey parameters and by comparing twofilter functions. We find that the dominant noise source for our survey isshape noise at almost all significance levels and that spurious clusterdetections due to projections of large-scale structures are negligible, exceptpossibly for highly significantly detected peaks. Our full cluster catalog has155 cluster candidates, 116 found with the Postman matched filter, 59 extendedX-ray sources, and 31 shear selected potential clusters. Most of these clustercandidates were not previously known. The present catalog will be a solidfoundation for studying possible selection effects in either method.

BLOX: The Bonn Lensing, Optical, and X-ray selected galaxy clusters -- I. Cluster catalog construction