Institute for Advanced Study Informal Astrophysics Seminar

Accurate cluster masses are a key component in deriving cosmological constraints from galaxy cluster abundance. Weak lensing (WL) provides a direct measure of the cluster mass, both baryonic and dark, regardless of the underlying nature of the mass or the dynamics of the system. The Subaru Hyper Suprime-Cam Strategic Survey Program (HSC-SSP) survey is underway and will image 1400 square degrees in 5 broad bands to r~26. In this talk, I will present the HSC survey and discuss the challenges in measuring the WL mass of galaxy clusters using the first HSC data release of ~150 square degrees. I will show how we calibrate the Planck Sunyaev Zel'dovich (SZ) cluster masses with the aid of HSC WL that will ultimately lead to improved cosmological constraints from future cluster SZ surveys.