The SRG/eROSITA All-Sky Survey: Weak-Lensing of eRASS1 Galaxy Clusters in KiDS-1000 and Consistency Checks with DES Y3 HSC-Y3
arxiv(2024)
摘要
We aim to participate in the calibration of the X-ray photon count rate to
halo mass scaling relation of galaxy clusters selected in the first eROSITA
All-Sky Survey on the Western Galactic Hemisphere (eRASS1) using KiDS-1000
weak-lensing (WL) data. We measure the radial shear profiles around eRASS1
galaxy clusters using background galaxies in KiDS-1000, as well as the cluster
member contamination. Furthermore we provide consistency checks with the other
stage-III WL surveys who take part in the eRASS1 mass calibration, DES Y3 and
HSC-Y3. We determine the cluster member contamination of eRASS1 clusters
present in KiDS-1000 based on source number density profiles, where we account
for the obscuration caused by cluster galaxies. The extracted shear profiles,
together with the contamination model and the lens sample selection, are then
analysed through a Bayesian population model. We calibrate the WL mass bias
parameter by analysing realistic synthetic shear profiles from mock cluster
catalogues. Our consistency checks between KiDS-1000 and DES Y3 HSC-Y3
include the comparison of contamination-corrected density contrast profiles
employing the union of background sources around common clusters, as well as
the individual scaling relation results. We present a global contamination
model for eRASS1 clusters in KiDS-1000 and the calibration results of the X-ray
photon count rate to halo mass relation. The results of the WL mass bias
parameter show that the uncertainty of the multiplicative shear bias dominates
the systematic error budget at low clusters redshifts while the uncertainty of
our contamination model does at high ones. The cross-checks between the three
WL surveys show that they are statistically consistent with each other. This
enables for the first time cosmological constraints from clusters calibrated by
three state-of-the-art WL surveys. (abridged)
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