KiDS-Legacy: cosmological constraints from cosmic shear with the complete Kilo-Degree Survey
We present cosmic shear constraints from the completed Kilo-Degree Survey (KiDS), where the cosmological parameter is found to be in agreement (0.73σ) with results from the Planck Legacy cosmic microwave background experiment. The final KiDS footprint spans 1347 square degrees of deep nine-band imag...
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| Main Authors: | , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
28 November 2025
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| In: |
Astronomy and astrophysics
Year: 2025, Volume: 703 |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/202554908 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.1051/0004-6361/202554908 Verlag, kostenfrei, Volltext: https://www.aanda.org/articles/aa/abs/2025/11/aa54908-25/aa54908-25.html 
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| Author Notes: | Angus H. Wright, Benjamin Stölzner, Marika Asgari, Maciej Bilicki, Benjamin Giblin, Catherine Heymans, Hendrik Hildebrandt, Henk Hoekstra, Benjamin Joachimi, Konrad Kuijken, Shun-Sheng Li, Robert Reischke, Maximilian von Wietersheim-Kramsta, Mijin Yoon, Pierre Burger, Nora Elisa Chisari, Jelte de Jong, Andrej Dvornik, Christos Georgiou, Joachim Harnois-Déraps, Priyanka Jalan, Anjitha John William, Shahab Joudaki, Giorgio Francesco Lesci, Laila Linke, Arthur Loureiro, Constance Mahony, Matteo Maturi, Lance Miller, Lauro Moscardini, Nicola R. Napolitano, Lucas Porth, Mario Radovich, Peter Schneider, Tilman Tröster, Edwin Valentijn, Anna Wittje, Ziang Yan, and Yun-Hao Zhang |
| Summary: | We present cosmic shear constraints from the completed Kilo-Degree Survey (KiDS), where the cosmological parameter is found to be in agreement (0.73σ) with results from the Planck Legacy cosmic microwave background experiment. The final KiDS footprint spans 1347 square degrees of deep nine-band imaging across the optical and near-infrared (NIR), along with an extra 23-square degrees of KiDS-like calibration observations of deep spectroscopic surveys. Improvements in our redshift distribution estimation methodology, combined with our enhanced calibration data and multi-band image simulations, allowed us to extend our lensed sample out to a photometric redshift of z B ≤ 2.0. Compared to previous KiDS analyses, the increased survey area and redshift depth results in a ∼32% improvement in constraining power in terms of , where α = 0.58 has been optimised to match the revised degeneracy direction of σ 8 and Ω m for our current survey at higher redshift. We adopted a new physically motivated intrinsic alignment (IA) model that jointly depends on the galaxy sample’s halo mass and spectral type distributions, and which is informed by previous direct alignment measurements. We also marginalised over our uncertainty on the impact of baryon feedback on the non-linear matter power spectrum. Compared to previous KiDS analyses, we conclude that the increase seen in S8 primarily results from our improved redshift distribution estimation and calibration, as well as a new survey area and improved image reduction. Our companion paper presents a full suite of internal and external consistency tests (including joint constraints with other datasets), finding the KiDS-Legacy dataset to be the most internally robust sample produced by KiDS to date. |
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| Item Description: | Gesehen am 11.03.2026 |
| Physical Description: | Online Resource |
| ISSN: | 1432-0746 |
| DOI: | 10.1051/0004-6361/202554908 |