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We present the results of an ongoing weak lensing survey conducted with theSubaru telescope whose initial goal is to locate and study the distribution ofshear-selected structures or halos. Using a Suprime-cam imaging survey spanning21.82 square degree, we present a catalog of 100 candidate halos located fromlensing convergence maps. Our sample is reliably drawn from that subset of oursurvey area, (totaling 16.72 square degree) uncontaminated by bright stars andedge effects and limited at a convergence signal to noise ratio of 3.69. Tovalidate the sample detailed spectroscopic measures have been made for 26candidates using the Subaru multi-object spectrograph, FOCAS. All are confirmedas clusters of galaxies but two arise as the superposition of multiple clustersviewed along the line of sight. Including data available in the literature andan ongoing Keck spectroscopic campaign, a total of 41 halos now have reliableredshifts. For one of our survey fields, the XMM LSS (Pierre et al. 2004)field, we compare our lensing-selected halo catalog with its X-ray equivalent.Of 15 halos detected in the XMM-LSS field, 10 match with published X-rayselected clusters and a further 2 are newly-detected and spectroscopicallyconfirmed in this work. Although three halos have not yet been confirmed, thehigh success rate within the XMM-LSS field (12/15) confirms that weak lensingprovides a reliable method for constructing cluster catalogs, irrespective ofthe nature of the constituent galaxies or the intracluster medium.

A Subaru Weak Lensing Survey I: Cluster Candidates and Spectroscopic Verification