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We present properties of moderately massive clusters of galaxies detected bythe newly developed Hyper Suprime-Cam on the Subaru telescope using weakgravitational lensing. Eight peaks exceeding a S/N ratio of 4.5 are identifiedon the convergence S/N map of a 2.3 square degree field observed during theearly commissioning phase of the camera. Multi-color photometric data is usedto generate optically selected clusters using the CAMIRA algorithm. The opticalcluster positions were correlated with the peak positions from the convergencemap. All eight significant peaks have optical counterparts. The velocitydispersion of clusters are evaluated by adopting the Singular Isothemal Sphere(SIS) fit to the tangential shear profiles, yielding virial mass estimates,M500c, of the clusters which range from 2.7x10^13 to 4.4x10^14 solar mass. Thenumber of peaks is considerably larger than the average number expected fromLambdaCDM cosmology but this is not extremely unlikely if one takes the largesample variance in the small field into account. We could, however, safelyargue that the peak count strongly favours the recent Planck result suggestinghigh sigma8$value of 0.83. The ratio of stellar mass to the dark matter halomass shows a clear decline as the halo mass increases. If the gas massfraction, fg, in halos is universal, as has been suggested in the literature,the observed baryon mass in stars and gas shows a possible deficit comparedwith the total baryon density estimated from the baryon oscillation peaks inanisotropy of the cosmic microwave background.

Properties of Weak Lensing Clusters Detected on Hyper Suprime-Cam 2.3 Square Degree Field