Investigating Cluster Astrophysics and Cosmology with Cross-Correlation of the Thermal Sunyaev-Zel'dovich Effect and Weak Lensing

Abstract

Recent detections of the cross-correlation of the thermal Sunyaev-Zel'dovich (tSZ) effect and weak gravitational lensing (WL) enable unique studies of cluster astrophysics and cosmology. In this work, we present constraints on the amplitude of the non-thermal pressure fraction in galaxy clusters, ${\alpha }_0$, and the amplitude of the matter power spectrum, ${\sigma }_8$, using measurements of the tSZ power spectrum from Planck, and the tSZ-WL cross-correlation from Planck and the Red Cluster Sequence Lensing Survey. We fit the data to a semi-analytic model with the covariance matrix using $N$-body simulations. We find that the tSZ power spectrum alone prefers ${\sigma }_8\sim 0.85$ and a large fraction of non-thermal pressure (${\alpha }_0\sim 0.2$-$0.3$). The tSZ-WL cross-correlation on the other hand prefers a significantly lower ${\sigma }_8\sim 0.6$, and low ${\alpha }_0\sim 0.05$. We show that this tension can be mitigated by allowing for a steep slope in the stellar-mass-halo-mass relation, which would cause a reduction of the gas in low-mass halos. In such a model, the combined data prefer ${\sigma }_8\sim 0.7$ and ${\alpha }_0\sim 0.2$, consistent with predictions from hydrodynamical simulations.

arXiv comment13 pages, 11 figures, MNRAS in press

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