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arXiv · 2503.19442

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

Benjamin Stölzner·Angus H. Wright·Marika Asgari·Catherine Heymans·Hendrik Hildebrandt·Henk Hoekstra·Benjamin Joachimi·Konrad Kuijken·Shun-Sheng 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·Arthur Loureiro·Matteo Maturi·Lauro Moscardini·Nicola R. Napolitano·Lucas Porth·Mario Radovich·Tilman Tröster·Edwin Valentijn·Maximilian von Wietersheim-Kramsta·Anna Wittje·Ziang Yan·Yun-Hao Zhang
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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 compare cosmological constraints between subsets of the KiDS-Legacy dataset split by redshift, angular scale, galaxy colour and spatial region. We also review a range of two-point cosmic shear statistics. With the data passing all our 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 find constraints consistent with Planck measurements of the cosmic microwave background with $S_8\equiv \sigma_8\sqrt{\Omega_{\rm m}/0.3} = 0.814^{+0.011}_{-0.012}$ and $\sigma_8 = 0.802^{+0.022}_{-0.018}$.

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Benjamin Stölzner, Angus H. Wright, Marika Asgari, Catherine Heymans, Hendrik Hildebrandt, Henk Hoekstra, Benjamin Joachimi, Konrad Kuijken, Shun-Sheng 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, Arthur Loureiro, Matteo Maturi, Lauro Moscardini, Nicola R. Napolitano, Lucas Porth, Mario Radovich, Tilman Tröster, Edwin Valentijn, Maximilian von Wietersheim-Kramsta, Anna Wittje, Ziang Yan, Yun-Hao Zhang. 2025-03-25. KiDS-Legacy: Consistency of cosmic shear measurements and joint cosmological constraints with external probes. https://doi.org/10.1051/0004-6361%2F202554893

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