KiDS-1000 cosmology: Cosmic shear constraints and comparison between two point statistics

Asgari, Marika; Lin, Chieh An; Joachimi, Benjamin; Giblin, Benjamin; Heymans, Catherine; Hildebrandt, Hendrik; Kannawadi, Arun; Stölzner, Benjamin; Tröster, Tilman; Van Den Busch, Jan Luca; Wright, Angus H.; Bilicki, Maciej; Blake, Chris; De Jong, Jelte; Dvornik, Andrej; Erben, Thomas; Getman, Fedor; Hoekstra, Henk; Köhlinger, Fabian; Kuijken, Konrad; Miller, Lance; Radovich, Mario; Schneider, Peter; Shan, Huan Yuan; Valentijn, Edwin

Abstract

We present cosmological constraints from a cosmic shear analysis of the fourth data release of the Kilo-Degree Survey (KiDS-1000), which doubles the survey area with nine-band optical and near-infrared photometry with respect to previous KiDS analyses. Adopting a spatially flat standard cosmological model, we find S8 = σ8(ωm/0.3)0.5 = 0.759-0.021+0.024 for our fiducial analysis, which is in 3σ tension with the prediction of the Planck Legacy analysis of the cosmic microwave background. We compare our fiducial COSEBIs (Complete Orthogonal Sets of E/B-Integrals) analysis with complementary analyses of the two-point shear correlation function and band power spectra, finding the results to be in excellent agreement. We investigate the sensitivity of all three statistics to a number of measurement, astrophysical, and modelling systematics, finding our S8 constraints to be robust and dominated by statistical errors. Our cosmological analysis of different divisions of the data passes the Bayesian internal consistency tests, with the exception of the second tomographic bin. As this bin encompasses low-redshift galaxies, carrying insignificant levels of cosmological information, we find that our results are unchanged by the inclusion or exclusion of this sample.

Citation

Asgari, M., Lin, C. A., Joachimi, B., Giblin, B., Heymans, C., Hildebrandt, H., Kannawadi, A., Stölzner, B., Tröster, T., Van Den Busch, J. L., Wright, A. H., Bilicki, M., Blake, C., De Jong, J., Dvornik, A., Erben, T., Getman, F., Hoekstra, H., Köhlinger, F., Kuijken, K., …Valentijn, E. (2021). KiDS-1000 cosmology: Cosmic shear constraints and comparison between two point statistics. Astronomy and Astrophysics, 645, Article A104. https://doi.org/10.1051/0004-6361/202039070

• Journal Article Type: Article
• Acceptance Date: Oct 12, 2020
• Online Publication Date: Jan 22, 2021
• Publication Date: 2021-01
• Deposit Date: Apr 5, 2022
• Publicly Available Date: Apr 6, 2022
• Journal: Astronomy and Astrophysics
• Print ISSN: 0004-6361
• Electronic ISSN: 1432-0746
• Publisher: EDP Sciences
• Peer Reviewed: Peer Reviewed
• Volume: 645
• Article Number: A104
• DOI: https://doi.org/10.1051/0004-6361/202039070
• Public URL: https://hull-repository.worktribe.com/output/3965018