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September 5, 2025Open Access

KiDS-Legacy: Consistency of cosmic shear measurements and joint cosmological constraints with external probes

Key Points

All data passed consistency metrics, demonstrating the high internal consistency of the KiDS-Legacy catalogue.
The joint analysis of KiDS-Legacy, DES Y3 cosmic shear, and external data yielded constraints aligning with Planck measurements.
Three tiers of metrics assessed consistency across subsets by redshift, angular scale, color, and region.
The results emphasize cosmic shear's role in cosmological measurements, reinforcing the validity of previous findings.

Abstract

We present a cosmic shear consistency analysis of the final data release from the Kilo-Degree Survey (KiDS-Legacy). By adopting three tiers of consistency metrics, we compared cosmological constraints between subsets of the KiDS-Legacy dataset split by redshift, angular scale, galaxy colour, and spatial region. We also reviewed a range of two-point cosmic shear statistics. As all the data passed our set of consistency metric tests, we demonstrate that KiDS-Legacy is the most internally consistent KiDS catalogue to date. In a joint cosmological analysis of KiDS-Legacy and DES Y3 cosmic shear, combined with data from the Pantheon+ Type Ia supernovae compilation and baryon acoustic oscillations from DESI Y1, we report constraints that are consistent with Planck measurements of the cosmic microwave background, with S₈≡ σ₈ Ω_ ̊m m and σ₈ = 0. 802^

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