SPT Clusters with DES and HST Weak Lensing. I. Cluster Lensing and Bayesian Population Modeling of Multi-Wavelength Cluster Datasets
arxiv(2023)
Abstract
We present a Bayesian population modeling method to analyze the abundance of
galaxy clusters identified by the South Pole Telescope (SPT) with a
simultaneous mass calibration using weak gravitational lensing data from the
Dark Energy Survey (DES) and the Hubble Space Telescope (HST). We discuss and
validate the modeling choices with a particular focus on a robust,
weak-lensing-based mass calibration using DES data. For the DES Year 3 data, we
report a systematic uncertainty in weak-lensing mass calibration that increases
from 1
account for uncertainties in the impact of baryonic effects. We implement an
analysis pipeline that joins the cluster abundance likelihood with a
multi-observable likelihood for the Sunyaev-Zel'dovich effect, optical
richness, and weak-lensing measurements for each individual cluster. We
validate that our analysis pipeline can recover unbiased cosmological
constraints by analyzing mocks that closely resemble the cluster sample
extracted from the SPT-SZ, SPTpol ECS, and SPTpol 500d surveys and the DES Year
3 and HST-39 weak-lensing datasets. This work represents a crucial prerequisite
for the subsequent cosmological analysis of the real dataset.
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