CHEX-MATE: AMALGAM weak-lensing analysis of 41 Planck Sunyaev-Zel'dovich-selected galaxy clusters
Abstract
We present a weak-lensing shear analysis of 41 Planck SZ-selected galaxy clusters at 0.11≤ z≤ 0.55 from the CHEX-MATE sample, using wide-field Subaru/Suprime-Cam and CFHT/MegaPrime imaging from the AMALGAM project. We detect the azimuthally averaged weak-lensing signal around the X-ray peak of each cluster, achieving a median S/N of 6.5 per cluster. The 45∘-rotated component has a median S/N of -0.1 and ranges from -1.8 to +1.8, consistent with zero. We model the excess surface mass density profile of each cluster with an NFW profile to infer weak-lensing mass and concentration constraints. The total systematic uncertainty in the weak-lensing mass calibration is assessed to be 8%. Using a hierarchical Bayesian framework, we then derive weak-lensing-calibrated scaling relations for the halo concentration, c200, as a function of M200 and redshift, and for the Planck SZ mass proxy, MSZ, as a function of M500 and redshift, while accounting for sample selection effects, weak-lensing modelling biases, and residual calibration uncertainty. At M200=1015M⊙ and z=0.25, we find c200=3.53±0.71 with an intrinsic scatter of 0.22±0.04 dex. The inferred normalisation and scatter are consistent with recent ΛCDM predictions for massive haloes, with no significant mass or redshift dependence over the probed range. For the Planck mass proxy, our baseline regression yields MSZ/M500=0.83±0.09 at M500=7×1014M⊙ and z=0.25, with an intrinsic scatter of 0.10±0.02 dex. A restricted model with fixed unit mass slope and no redshift evolution gives 1−b=0.72±0.11. We also provide weak-lensing-calibrated posterior estimates of M500 for the sample based on the baseline MSZ--M500--z relation. These results provide an initial weak-lensing mass calibration for CHEX-MATE multi-probe cluster studies.
Versions
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BibTeX
@misc{umetsu2026chexmate,
title = {{CHEX-MATE: AMALGAM weak-lensing analysis of 41 Planck Sunyaev-Zel'dovich-selected galaxy clusters}},
author = {Keiichi Umetsu and Raphael Gavazzi and Mauro Sereno and Nobuhiro Okabe and Emmanuel Bertin and Gianluca Castignani and Stefano Ettori and Fabio Gastaldello and Carlo Giocoli and Scott T. Kay and Junhan Kim and Maggie Lieu and Lorenzo Lovisari and Ben J. Maughan and Mario Nonino and Lorenzo Pizzuti and Etienne Pointecouteau and Gabriel W. Pratt and Mario Radovich and Elena Rasia and Mariachiara Rossetti and Harshda Saxena and Jack Sayers},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2606.24142},
eprint = {2606.24142},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2606.24142},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - CHEX-MATE: AMALGAM weak-lensing analysis of 41 Planck Sunyaev-Zel'dovich-selected galaxy clusters
AU - Keiichi Umetsu
AU - Raphael Gavazzi
AU - Mauro Sereno
AU - Nobuhiro Okabe
AU - Emmanuel Bertin
AU - Gianluca Castignani
AU - Stefano Ettori
AU - Fabio Gastaldello
AU - Carlo Giocoli
AU - Scott T. Kay
AU - Junhan Kim
AU - Maggie Lieu
AU - Lorenzo Lovisari
AU - Ben J. Maughan
AU - Mario Nonino
AU - Lorenzo Pizzuti
AU - Etienne Pointecouteau
AU - Gabriel W. Pratt
AU - Mario Radovich
AU - Elena Rasia
AU - Mariachiara Rossetti
AU - Harshda Saxena
AU - Jack Sayers
PY - 2026
DA - 2026/10/26
PB - arXiv
DO - 10.48550/arxiv.2606.24142
UR - https://arxiv.org/abs/2606.24142
AB - We present a weak-lensing shear analysis of 41 Planck SZ-selected galaxy clusters at 0.11≤ z≤ 0.55 from the CHEX-MATE sample, using wide-field Subaru/Suprime-Cam and CFHT/MegaPrime imaging from the AMALGAM project. We detect the azimuthally averaged weak-lensing signal around the X-ray peak of each cluster, achieving a median S/N of 6.5 per cluster. The 45^∘-rotated component has a median S/N of -0.1 and ranges from -1.8 to +1.8, consistent with zero. We model the excess surface mass density profile of each cluster with an NFW profile to infer weak-lensing mass and concentration constraints. The total systematic uncertainty in the weak-lensing mass calibration is assessed to be 8%. Using a hierarchical Bayesian framework, we then derive weak-lensing-calibrated scaling relations for the halo concentration, c_200, as a function of M_200 and redshift, and for the Planck SZ mass proxy, M_SZ, as a function of M_500 and redshift, while accounting for sample selection effects, weak-lensing modelling biases, and residual calibration uncertainty. At M_200=10^15M_⊙ and z=0.25, we find c_200=3.53±0.71 with an intrinsic scatter of 0.22±0.04 dex. The inferred normalisation and scatter are consistent with recent ΛCDM predictions for massive haloes, with no significant mass or redshift dependence over the probed range. For the Planck mass proxy, our baseline regression yields M_SZ/M_500=0.83±0.09 at M_500=7×10^14M_⊙ and z=0.25, with an intrinsic scatter of 0.10±0.02 dex. A restricted model with fixed unit mass slope and no redshift evolution gives 1−b=0.72±0.11. We also provide weak-lensing-calibrated posterior estimates of M_500 for the sample based on the baseline M_SZ--M_500--z relation. These results provide an initial weak-lensing mass calibration for CHEX-MATE multi-probe cluster studies.
ER -