Stern, C;
Dietrich, JP;
Bocquet, S;
Applegate, D;
Mohr, JJ;
Bridle, SL;
Kind, MC;
... Walker, AR; + view all
(2019)
Weak-lensing analysis of SPT-selected galaxy clusters using Dark Energy Survey Science Verification data.
Monthly Notices of the Royal Astronomical Society
, 485
(1)
pp. 69-87.
10.1093/mnras/stz234.
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Abstract
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, ASZ=12.0+2.6−6.7 when using a prior on the mass slope BSZ from the latest SPT cluster cosmology analysis. Without this prior, we recover ASZ=10.8+2.3−5.2 and BSZ=1.30+0.22−0.44. Results in both cases imply lower cluster masses than measured in previous work with and without WL, although the uncertainties are large. The WL derived value of BSZ is ≈20 per cent lower than the value preferred by the most recent SPT cluster cosmology analysis. The method demonstrated in this work is designed to constrain cluster masses and cosmological parameters simultaneously and will form the basis for subsequent studies that employ the full SPT cluster sample together with the DES data.
| Type: | Article |
|---|---|
| Title: | Weak-lensing analysis of SPT-selected galaxy clusters using Dark Energy Survey Science Verification data |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stz234 |
| Publisher version: | https://doi.org/10.1093/mnras/stz234 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | gravitational lensing: weak, galaxies: clusters: general, cosmology: observations |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10074967 |
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