Cross-correlation of the thermal Sunyaev-Zel'dovich effect and weak gravitational lensing: Planck and Subaru Hyper Suprime-Cam first-year data

TL;DR

This study measures the cross-correlation between the thermal Sunyaev-Zel'dovich effect and weak gravitational lensing using Planck and Subaru data, constraining the hydrostatic mass bias in galaxy clusters.

Contribution

It provides the first combined analysis of tSZ and WL data from Planck and Subaru to constrain cluster astrophysics and the hydrostatic mass bias.

Findings

Hydrostatic mass bias estimated at 26.9% with uncertainties.

Results consistent with recent mass calibration measurements.

Enhanced understanding of non-thermal pressure support in galaxy clusters.

Abstract

Cross-correlation analysis of the thermal Sunyaev-Zel'dovich (tSZ) effect and weak gravitational lensing (WL) provides a powerful probe of cosmology and astrophysics of the intra-cluster medium. We present the measurement of the cross-correlation of tSZ and WL from Planck and Subaru Hyper-Suprime Cam. The combination enables us to study cluster astrophysics at high redshift. We use the tSZ-WL cross-correlation and the tSZ auto-power spectrum measurements to place a tight constraint on the hydrostatic mass bias, which is a measure of the degree of non-thermal pressure support in galaxy clusters. With the prior on cosmological parameters derived from the analysis of the cosmic microwave background anisotropies by Planck and taking into account foreground contributions both in the tSZ auto-power spectrum and the tSZ-WL cross-correlation, the hydrostatic mass bias is estimated to be $26.9^{+8.9}_{-4.4} \%$ ($68\%$ C.L.), which is consistent with recent measurements by mass calibration techniques.