Li, Shun-Sheng;
Hoekstra, Henk;
Kuijken, Konrad;
Asgari, Marika;
Bilicki, Maciej;
Giblin, Benjamin;
Heymans, Catherine;
... Shan, HuanYuan; + view all
(2023)
KiDS-1000: Cosmology with improved cosmic shear measurements.
Astronomy & Astrophysics
, 679
, Article A133. 10.1051/0004-6361/202347236.
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Abstract
We present refined cosmological parameter constraints derived from a cosmic shear analysis of the fourth data release of the Kilo-Degree Survey (KiDS-1000). Our main improvements include enhanced galaxy shape measurements made possible by an updated version of the lensfit code and improved shear calibration achieved with a newly developed suite of multi-band image simulations. Additionally, we incorporated recent advancements in cosmological inference from the joint Dark Energy Survey Year 3 and KiDS-1000 cosmic shear analysis. Assuming a spatially flat standard cosmological model, we constrain S8 ≡ σ8(Ωm/0.3)0.5 = 0.776−0.027−0.003+0.029+0.002, where the second set of uncertainties accounts for the systematic uncertainties within the shear calibration. These systematic uncertainties stem from minor deviations from realism in the image simulations and the sensitivity of the shear measurement algorithm to the morphology of the galaxy sample. Despite these changes, our results align with previous KiDS studies and other weak lensing surveys, and we find a ∼2.3σ level of tension with the Planck cosmic microwave background constraints on S8.
| Type: | Article |
|---|---|
| Title: | KiDS-1000: Cosmology with improved cosmic shear measurements |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1051/0004-6361/202347236 |
| Publisher version: | https://doi.org/10.1051/0004-6361/202347236 |
| Language: | English |
| Additional information: | © The Authors 2023. Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0). |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10183652 |
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