Cosmological constraints from the abundance of shear-selected galaxy clusters in the Hyper Suprime-Cam Subaru Strategic Program

I-Non Chiu^3*, Kai-Feng Chen², Masamune Oguri¹

¹Department of Physics,, Chiba University, Tokyo, Japan
²Department of Physics, assachusetts Institute of Technology, Cambridge, MA, USA
³Department of Physics, National Cheng Kung University, Tainan City, Taiwan

* Presenter:I-Non Chiu, email:inchiu@phys.ncku.edu.tw

We present cosmological constraints using the abundance of shear-selected galaxy clusters in the Hyper Suprime-Cam (HSC) Subaru Strategic Program. The clusters are selected in the mass maps constructed using the three-year (Y3) weak-lensing data with an area of ≈500 deg2, resulting in a sample size of 130 clusters with a high signal-to-noise ratio 𝜈 of 𝜈≥4.7. Owning 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 carefully account for (1) the bias in the photometric redshift of sources, (2) the bias and scatter in the weak-lensing mass using a simulation-based calibration, and (3) the measurement uncertainty that is directly estimated in the mass maps using an injection-based method developed in a companion paper (Chen+in prep.). In a blind analysis, we derive the constraints on Ωm, 𝜎8, and the parameter 𝑆8. We compare our cosmological constraints with external experiments.

Keywords: Weak Gravitational Lensing, Galaxy Clusters, Cosmology