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 zeta-M-500 relation, A(SZ) = 12.0(-6.7)(+2.6) when using a prior on the mass slope B-SZ from the latest SPT cluster cosmology analysis. Without this prior, we recover A(SZ) = 10.8(-5.2)(+2.3) and B-SZ = 1.30(-0.44)(+0.22). 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 B-SZ is approximate to 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.
Stern, C., et al. "Weak Lensing Analysis of SPT selected Galaxy Clusters using Dark Energy Survey Science Verification Data." Monthly Notices of the Royal Astronomical Society, vol. 485, no. 1, May. 2019. https://doi.org/10.1093/mnras/stz234
Stern, C., Dietrich, J. P., Bocquet, S., Applegate, D. J., Mohr, J. J., Bridle, S. L., Carrasco Kind, M, Gruen, D., Jarvis, M., & Kacprzak, T. (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). https://doi.org/10.1093/mnras/stz234
Stern, C., Dietrich, J. P., Bocquet, S., et al., "Weak Lensing Analysis of SPT selected Galaxy Clusters using Dark Energy Survey Science Verification Data," Monthly Notices of the Royal Astronomical Society 485, no. 1 (2019), https://doi.org/10.1093/mnras/stz234
@article{osti_1542151,
author = {Stern, C. and Dietrich, J. P. and Bocquet, S. and Applegate, D. J. and Mohr, J. J. and Bridle, S. L. and Carrasco Kind, M and Gruen, D. and Jarvis, M. and Kacprzak, T.},
title = {Weak Lensing Analysis of SPT selected Galaxy Clusters using Dark Energy Survey Science Verification Data},
annote = {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 zeta-M-500 relation, A(SZ) = 12.0(-6.7)(+2.6) when using a prior on the mass slope B-SZ from the latest SPT cluster cosmology analysis. Without this prior, we recover A(SZ) = 10.8(-5.2)(+2.3) and B-SZ = 1.30(-0.44)(+0.22). 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 B-SZ is approximate to 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.},
doi = {10.1093/mnras/stz234},
url = {https://www.osti.gov/biblio/1542151},
journal = {Monthly Notices of the Royal Astronomical Society},
issn = {ISSN 0035-8711},
number = {1},
volume = {485},
place = {United States},
year = {2019},
month = {05}}
USDOE Office of Science - Office of High Energy Physics
DOE Contract Number:
AC02-06CH11357
OSTI ID:
1542151
Journal Information:
Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 1 Vol. 485; ISSN 0035-8711