Investigating cluster astrophysics and cosmology with crosscorrelation of the thermal SunyaevZel'dovich effect and weak lensing
Abstract
Recent detections of the crosscorrelation of the thermal SunyaevZel'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 nonthermal pressure fraction in galaxy clusters, α_{0}, and the amplitude of the matter power spectrum, σ_{8}, using measurements of the tSZ power spectrum from Planck, and the tSZWL crosscorrelation from Planck and the Red Cluster Sequence Lensing Survey. We fit the data to a semianalytic model with the covariance matrix using Nbody simulations. We find that the tSZ power spectrum alone prefers σ_{8} ∼ 0.85 and a large fraction of nonthermal pressure (α_{0} ∼ 0.20.3). The tSZWL crosscorrelation on the other hand prefers a significantly lower σ_{8} ∼ 0.6 and low α_{0} ∼ 0.05. We show that this tension can be mitigated by allowing for a steep slope in the stellar masshalo mass relation, which would cause a reduction of the gas in lowmass haloes. In such a model, the combined data prefer σ_{8} ∼ 0.7 and α_{0} ∼ 0.2, consistent with predictions from hydrodynamical simulations.
 Publication:

Monthly Notices of the Royal Astronomical Society
 Pub Date:
 March 2018
 DOI:
 10.1093/mnras/stx3215
 arXiv:
 arXiv:1706.08972
 Bibcode:
 2018MNRAS.475..532O
 Keywords:

 methods: numerical;
 cosmology: theory;
 largescale structure of Universe;
 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 13 pages, 11 figures, MNRAS in press