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

By M. Asgari, Chieh-An Lin, B. Joachimi, B. Giblin, Catherine Heymans, H. Hildebrandt, A. Kannawadi, B. Stolzner, T. Troster, J. L. V. D. Busch and 14 more. Astronomy & Astrophysics, 2020

524 citations recorded by the source corpus.

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 findS8=σ8(Ωm/0.3)0.5= 0.759−0.021+0.024for our fiducial analysis, which is in 3σtension with the prediction of thePlanckLegacy 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 ourS8constraints 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.

Subfields: Applied Mathematics, Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/f62f94e4626506c3cd29295242b4f2ba0aa9f962

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In Applied Mathematics

Catherine Heymans

In Astronomy and Astrophysics

Citations in the corpus

The Atacama Cosmology Telescope: DR6 Gravitational Lensing Map and Cosmological Parameters (2023, methodology): “…reported in the literature do not use the marginalized mean and standard error as we do, but might report quantities such as the multivariate maximum posterior (MAP) and its credible interval calculated using its projected joint highest posterior density (PJ-HPD), e.g. (Asgari et al. 2021).”
The Atacama Cosmology Telescope: A Measurement of the DR6 CMB Lensing Power Spectrum and Its Implications for Structure Growth (2023, methodology): “…measurements seem to give lower values of S8 or σ8 than predicted by Planck at the (2–3)σ level, including KiDS, DES and HSC (Heymans et al. 2013; Asgari et al. 2021; Heymans et al. 2021; Krolewski et al. 2021; Philcox & Ivanov 2022; Abbott et al. 2022; Loureiro et al. 2022; Li et al. 2023;…”
hmcode-2020: improved modelling of non-linear cosmological power spectra with baryonic feedback (2020, background): “…is too tight to encompass the parameter space that is constrainable by current weak-lensing surveys such as KiDS (e.g., Hildebrandt et al. 2020; Asgari et al. 2020; Heymans et al. 2020), DES (e.g., Abbott et al. 2018), or HSC (e.g., 2 Taken from the node cosmologies of Heitmann et al. (2014)…”