KiDS-Legacy: Consistency of cosmic shear measurements and joint cosmological constraints with external probes
Benjamin Stölzner, Angus H. Wright, Marika Asgari, Catherine Heymans, H. Hildebrandt, Henk Hoekstra, Benjamin Joachimi, Konrad Kuijken, Shangrong Li, Constance Mahony, Robert Reischke, Mijin Yoon, Maciej Bilicki, Pierre Burger, Nora Elisa Chisari, Andrej Dvornik, Christos Georgiou, Benjamin Giblin, Joachim Harnois-Déraps, Priyanka Jalan, Anjitha John William, Shahab Joudaki, Giorgio Francesco Lesci, Laila Linke, A. Loureiro, M. Maturi, L. Moscardini, R. Nicola Napolitano, Lucas Porth, M. Radovich, Tilman Tröster, E. A. Valentijn, Maximilian von Wietersheim-Kramsta, Anna Wittje, Ziang Yan, Yun-Hao Zhang
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 S 8 ≡ √ σ 8 Ω m /0.3 = 0.814 −0.012 +0.011 and σ 8 = 0.802 −0.018 +0.022 .