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KiDS-1000 cosmology: Constraints from density split statistics

Burger, PA; Friedrich, O; Harnois-Déraps, J; Schneider, P; Asgari, M; Bilicki, M; Hildebrandt, H; ... Tröster, T; + view all (2023) KiDS-1000 cosmology: Constraints from density split statistics. Astronomy and Astrophysics , 669 A69-A69. 10.1051/0004-6361/202244673. Green open access

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Abstract

Context. Weak lensing and clustering statistics beyond two-point functions can capture non-Gaussian information about the matter density field, thereby improving the constraints on cosmological parameters relative to the mainstream methods based on correlation functions and power spectra. Aims. This paper presents a cosmological analysis of the fourth data release of the Kilo Degree Survey based on the density split statistics, which measures the mean shear profiles around regions classified according to foreground densities. The latter is constructed from a bright galaxy sample, which we further split into red and blue samples, allowing us to probe their respective connection to the underlying dark matter density. Methods. We used the state-of-the-art model of the density splitting statistics and validated its robustness against mock data infused with known systematic effects such as intrinsic galaxy alignment and baryonic feedback. Results. After marginalising over the photometric redshift uncertainty and the residual shear calibration bias, we measured for the full KiDS-bright sample a structure growth parameter of S 8 ≡ σ8 √ m=0:3 = 0:73+0:03 -0:02 that is competitive and consistent with two-point cosmic shear results, a matter density of Ωm = 0:27 ± 0:02, and a constant galaxy bias of b = 1:37 ± 0:10.

Type: Article
Title: KiDS-1000 cosmology: Constraints from density split statistics
Open access status: An open access version is available from UCL Discovery
DOI: 10.1051/0004-6361/202244673
Publisher version: https://doi.org/10.1051/0004-6361/202244673
Language: English
Additional information: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third-party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Keywords: Cosmological parameters, large-scale structure of Universe, gravitational lensing: weak, methods: statistical
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.ucl.ac.uk/id/eprint/10164152
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