KiDS-1000: Improved constraints on cosmology, intrinsic alignments and baryonic feedback from clipped cosmic shear

arXiv:2608.07377 · astro-ph.CO · Submitted 2026-08-07 · Read on arXiv

Benjamin Giblin, Joachim Harnois-Déraps, Louise Paquereau, Catherine Heymans

astro-ph.CO

Submitted: 2026-08-07

Updated: 2026-08-10

Comments: 24 pages, 15 figures, submitted to MNRAS

Code: https://github.com/TiagoBsCastro/SLICER

License: http://creativecommons.org/licenses/by/4.0/

The gist: We present improved cosmological constraints from the fourth data release of the Kilo-Degree Survey ("KiDS-1000") using "clipped" shear correlation functions.

Terminology

Alignment — 21× in this paper · explained in 1 episode
Baryonic Feedback — 21× in this paper · explained in 3 episodes
Accuracy — 19× in this paper · explained in 1 episode
Clustering — 13× in this paper · explained in 2 episodes
Intrinsic Alignments — 12× in this paper
Weak Lensing — 10× in this paper · explained in 2 episodes
AGN — 8× in this paper · explained in 1 episode
Consistency — 7× in this paper · explained in 3 episodes
Cosmic Shear Analysis — 6× in this paper · explained in 2 episodes
Calibration — 5× in this paper · explained in 7 episodes
Matter Power Spectrum — 3× in this paper · explained in 2 episodes
Decoupling — 2× in this paper · explained in 2 episodes
Degeneracy — 2× in this paper · explained in 3 episodes
Trace — 2× in this paper · explained in 2 episodes
Benchmark — 1× in this paper · explained in 2 episodes
Fidelity — 1× in this paper · explained in 2 episodes
Gravitational Lensing — 1× in this paper · explained in 2 episodes
N-body simulations — 1× in this paper · explained in 2 episodes
Non-Gaussianity — 1× in this paper · explained in 2 episodes
Persistent Homology — 1× in this paper · explained in 3 episodes
Pruning — 1× in this paper · explained in 4 episodes
Robustness — 1× in this paper · explained in 5 episodes
Signal-to-noise ratio (SNR) — 1× in this paper · explained in 2 episodes
UK Science and Technology Facilities Council — 1× in this paper

Abstract

We present improved cosmological constraints from the fourth data release of the Kilo-Degree Survey ("KiDS-1000") using "clipped" shear correlation functions. Clipping filters the projected density field inferred from weak lensing data for the highest-density regions, allowing for two-point functions to extract additional cosmological information. We model, for the first time, the impact of systematics on clipped lensing statistics, including intrinsic alignments, baryonic feedback, photometric redshift uncertainties, and source-lens clustering. We train Gaussian process emulators on dark-matter-only and hydrodynamical N-body simulations to predict the cosmological and systematic dependence of both the clipped and conventional, "unclipped" shear correlation functions. We find that the combination of the clipped and unclipped probes improves the constraints on the free parameters of the w CDM model relative to the conventional approach, with a 16% tightening of the S 8 uncertainty and 24% for w 0. Our constraints, m = 0.263+0.035-0.038, S 8=0.724+0.027-0.027, and w 0 = -1.24+0.26-0.28, are consistent with the CDM model and with the cosmic shear analysis of Asgari et al. (2021) via a completely independent simulation- and emulator-based forward-modelling approach. We also find the complimentary information in the clipped statistic provides an upper limit on the baryon feedback strength, and improves the constraints on intrinsic alignments by 27%.

KiDS-1000: Improved constraints on cosmology, intrinsic alignments and baryonic feedback from clipped cosmic shear

Terminology

Abstract

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