KiDS-DR5 and first cosmic shear results from the full survey: KiDS-Legacy

26 Mar 2025

The mass distribution derived from gravitational lensing measurements from the KiDS survey. Red regions are overdense, blue ones underdense. The zoom in shows more detail of the large scale structure, and features the full moon to scale.

Cosmic shear results from the full KiDS survey (1347 sqdeg) are now available. This analysis, 'KiDS-Legacy', provides the best constraints on the amplitude of clustering parameters yet. Unlike the tensions seen in previous releases, these results are in full agreement with the best-fit LCDM cosmology fit to the CMB. Results are presented in five papers, and discussed in a video podcast on 'Cosmology Talks' as well as a press release from the Ruhr University Bochum.

Press release
Cosmology Talks podcast


For full details see the following five publications:

The fifth data release of the Kilo Degree Survey: Multi-epoch optical/NIR imaging covering wide and legacy-calibration fields

Wright et al., A&A, 686, A170 (2024)

We present the final data release of the Kilo-Degree Survey (KiDS-DR5), a public European Southern Observatory (ESO) wide-field imaging survey optimised for weak gravitational lensing studies. ...

Full article PDF
Astronomy & Astrophysics
arxiv:2503.19439


Layout of the complete KiDS observations on the sky

KiDS-Legacy: Cosmological constraints from cosmic shear with the complete Kilo-Degree Survey

Wright et al., arxiv:2503.19441 (2025)

We present cosmic shear constraints from the completed Kilo-Degree Survey (KiDS), where the cosmological parameter S8 ≡ σ8 √Ωm/0.3 = 0.815+0.016-0.02, is found to be in agreement (0.73σ) with results from the Planck Legacy cosmic microwave background experiment. ...

Full article PDF
arxiv:2503.19441


Final constraints on S8 and Ωm from 6-bin tomographic cosmic shear

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

Stölzner et al., arxiv:2503.19442 (2025)

We present a cosmic shear consistency analysis of the final data release from the Kilo-Degree Survey (KiDS-Legacy). ...

Full article PDF
arxiv:2503.19442


Consistency of the cosmology constraints between the different tomographic redshift bins

KiDS-Legacy: Redshift distributions and their calibration

Wright et al., arxiv:2503.19440 (2025)

We present the redshift calibration methodology and bias estimates for the cosmic shear analysis of the the fifth and final data release (DR5) of the Kilo-Degree Survey (KiDS). ...

Full article PDF
arxiv:2503.19440


Redshift distributions of the spectroscopic calibration data

KiDS-Legacy: Covariance validation and the unified OneCovariance framework for projected large-scale structure observables

Reischke et al., arxiv:2410.06962 (2025)

We introduce OneCovariance, an open-source software designed to accurately compute covariance matrices for an arbitrary set of two-point summary statistics across a variety of large-scale structure tracers. ...

Full article PDF
arxiv:2410.06962


Covariance matrix contributions for the COSEBIs data vector

A joint cosmic shear analysis of the Dark Energy Survey and KiDS

19 Sep 2023

KiDS and DES have joined forces to re-analyse the cosmic shear measurements from DES Year 3 and KiDS-1000. Together we defined a Hybrid analysis pipeline, selecting a unified framework for intrinsic alignment models, baryon feedback mitigation strategies, priors, samplers and models of the non-linear matter power spectrum. Our results are consistent with S8 constraints from observations of the cosmic microwave background by Planck, with agreement at the 1.7σ level.

For more information, watch our Cosmology Talk, read our Paper or download the data products.

Cosmology Talk
Scientific paper
Data download page

KiDS-1000 weak lensing data products available

8 Dec 2020

The data products from KiDS-1000, the weak lensing analysis of the KiDS DR4 data, are now available for download. This released data includes the galaxy shapes/photometry catalogue, 2-point shear statistics data vectors and covariance matrices, and parameter posterior samples. For more details and links to the data see the dedicated KiDS-1000 lensing pages, or follow the "Additional data products" link under the "Data access / KiDS DR4" drop-down menu at the top of this page.

KiDS-1000 lensing

The Universe Is More Homogeneous Than Expected

31 Jul 2020

New results from the Kilo-Degree Survey (KiDS) show that the universe is nearly 10 percent more homogeneous than the Standard Model of Cosmology (Λ-CDM) predicts. The latest KiDS map was made with the OmegaCAM on ESO's VLT Survey Telescope at Cerro Paranal in Northern Chile. A group of astronomers led from institutes in the Netherlands, Scotland, England and Germany have described the KiDS-1000 result in five articles, the last three of which appeared online today. They have been submitted for publication in the journal Astronomy & Astrophysics. The press release highlighting these results can be found via the Press releases page or the link below.

Press release

  

A zoom-in on a part of the KiDS-1000 density map, showing a patch of the Universe approximately 1.5 x 1 billion lightyears across. The grey square shows the size of an individual KiDS image, with a full moon for scale. Credit: B.Giblin, K.Kuijken and the KiDS team.

KiDS-1000 Cosmology Live Webinar

28 July 2020

We thank everyone for joining the KiDS-1000 Cosmology Webinar! For anyone who missed it, the full Webinar is now available on YouTube. The papers can also be previewed from our from our KiDS-1000 pre-prints page.

Webinar on YouTube
KiDS-1000 pre-prints

How heavy is the Universe?

12 May 2020

Scientific American has published an article titled "How heavy is the Univers? Conflicting Answers Hint at New Physics", based largely on an interview with KiDS co-lead Hendrik Hildebrandt. The article discusses how the tension between the measurements of σ8 from weak lensing surveys such as KiDS and those of the Planck cosmic microwave background results may indicate the standard model of cosmology may be breaking down. There is still a 1% chance this tension is a statistical fluke, and the only way to solve this issue is by increasing the measurement accuracy. The upcoming analysis of the full survey area will allow the KiDS team to do exactly this.

Article in Scientific American