Speaker
Description
I will present cosmological constraints using the abundance of weak-lensing shear-selected galaxy clusters selected in the Hyper Suprime-Cam (HSC) Subaru Strategic Program. The clusters are selected on the mass maps constructed using the latest three-year (Y3) weak-lensing data with an area of ≈ 500 deg2, resulting in a sample size of 129 clusters with a high signal-to-noise ratio 𝜈 of 𝜈 ≥ 4.7. Owing to the deep, wide-field, and uniform imaging of the HSC survey, this is by far the largest sample of shear-selected clusters, in which the selection solely depends on gravity and is free from any assumptions about the dynamical state. We obtain the fully marginalized constraint on $\hat{S}_8 \equiv \sigma_8 \left(\Omega_{m}/0.3\right)^{0.25} = 0.835^{+0.041}_{-0.044}$ (corresponding to a ~5% constraint) in a flat LCDM model. This work realizes a cosmological probe utilizing weak-lensing shear-selected clusters and paves the way forward in the upcoming LSST era. In the second part of the talk, I will share the latest development of the shear-selected cluster sample in the HSC survey.
