Weak-lensing analysis of SPT-selected galaxy clusters using Dark Energy Survey Science Verification data ...

• Main Authors: DES and SPT Collaborations, Stern, C., Kacprzak, Tomasz, et al.
• Format: Article in Journal/Newspaper
• Language: English
• Published: ETH Zurich 2019
• Subjects: gravitational lensing weak; galaxies clusters general; cosmology observations; South pole
• Online Access: https://dx.doi.org/10.3929/ethz-b-000343601; http://hdl.handle.net/20.500.11850/343601

We present weak-lensing (WL) mass constraints for a sample of massive galaxy clusters detected by the South Pole Telescope (SPT) via the Sunyaev–Zel’dovich effect (SZE). We use griz imaging data obtained from the Science Verification (SV) phase of the Dark Energy Survey (DES) to fit the WL shear signal of 33 clusters in the redshift range 0.25 ≤ z ≤ 0.8 with NFW profiles and to constrain a four-parameter SPT mass–observable relation. To account for biases in WL masses, we introduce a WL mass to true mass scaling relation described by a mean bias and an intrinsic, lognormal scatter. We allow for correlated scatter within the WL and SZE mass–observable relations and use simulations to constrain priors on nuisance parameters related to bias and scatter from WL. We constrain the normalization of the ζ−M₅₀₀ relation, A_SZ=12.0₋₆.₇⁺².⁶ when using a prior on the mass slope BSZ from the latest SPT cluster cosmology analysis. Without this prior, we recover ASZ=10.8₋₅.₂⁺².³ and BSZ=1.30₋₀.₄₄⁺⁰.²². Results in both ... : Monthly Notices of the Royal Astronomical Society, 485 (1) ...