KiDS-1000 cosmology: Constraints from density split statistics

Astronomy and Astrophysics, vol. 669, pp. A69

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\equiv \sigma_8 \sqrt{\Omega_{\mathrm{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.

Authors 16

1. Pierre Burger

   University of Bonn

   Affiliation as printed

   Argelander-Institut für Astronomie, Auf dem Hügel 71, 53121 Bonn, Germany

2. Oliver Friedrich

   Ludwig-Maximilians-Universität München

   Affiliation as printed

   Universitäts-Sternwarte, Fakultät für Physik, Ludwig-Maximilians-Universität München, Scheinerstr.1, 81679 München, Germany

3. Joachim Harnois-Déraps

   Newcastle University

   Affiliation as printed

   School of Mathematics, Statistics and Physics, Newcastle University, Newcastle upon Tyne NE1 7RU, UK

4. Peter Schneider

   University of Bonn

   Affiliation as printed

   Argelander-Institut für Astronomie, Auf dem Hügel 71, 53121 Bonn, Germany

5. Marika Asgari

   University of Hull

   Affiliation as printed

   E.A Milne Centre, University of Hull, Cottingham Road, Hull HU6 7RX, UK

6. Maciej Bilicki

   Center for Theoretical Physics · Polish Academy of Sciences

   Affiliation as printed

   Center for Theoretical Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland

7. Hendrik Hildebrandt

   Ruhr University Bochum

   Affiliation as printed

   Ruhr University Bochum, Faculty of Physics and Astronomy, Astronomical Institute (AIRUB), German Centre for Cosmological Lensing, 44780 Bochum, Germany

8. Angus H. Wright

   Ruhr University Bochum

   Affiliation as printed

   Ruhr University Bochum, Faculty of Physics and Astronomy, Astronomical Institute (AIRUB), German Centre for Cosmological Lensing, 44780 Bochum, Germany

9. T. Castro

   Trieste Astronomical Observatory · Istituto Nazionale di Fisica Nucleare, Sezione di Trieste · Institute for Fundamental Physics of the Universe · National Institute for Astrophysics

   Affiliation as printed

   INAF – Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Trieste, Via Tiepolo 11, 34143 Trieste, Italy

   INFN – Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Via Valerio 2, 34127 Trieste, Italy

   Institute for Fundamental Physics of the Universe, Via Beirut 2, 34151 Trieste, Italy

10. Klaus Dolag

    Max Planck Institute for Astrophysics · Ludwig-Maximilians-Universität München

    Affiliation as printed

    Germany Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Straße 1, 85741 Garching, Germany

    Universitäts-Sternwarte, Fakultät für Physik, Ludwig-Maximilians-Universität München, Scheinerstr.1, 81679 München, Germany

11. Catherine Heymans

    Royal Observatory · Ruhr University Bochum · University of Edinburgh

    Affiliation as printed

    Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK

    Ruhr University Bochum, Faculty of Physics and Astronomy, Astronomical Institute (AIRUB), German Centre for Cosmological Lensing, 44780 Bochum, Germany

12. Benjamin Joachimi

    University College London

    Affiliation as printed

    Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK

13. Konrad H. Kuijken Aachen Leiden Observatory

    Leiden University · Leiden Observatory

    Affiliation as printed

    Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands

14. N. Martinet

    Aix-Marseille Université · Laboratoire d’Astrophysique de Marseille

    Affiliation as printed

    Laboratoire d’Astrophysique de Marseille, Aix-Marseille Univ., Rue Frédéric Joliot-Curie 38, 13388 Marseille, France

    Laboratoire d'Astrophysique de Marseille, Aix-Marseille Univ., Rue Frédéric Joliot-Curie 38, 13388 Marseille, France

15. Huanyuan Shan

    Shanghai Astronomical Observatory · University of Chinese Academy of Sciences

    Affiliation as printed

    Shanghai Astronomical Observatory (SHAO), Nandan Road 80, Shanghai 200030, PR China

    University of Chinese Academy of Sciences, Yuquan Road 19A, Beijing 100049, PR China

16. Tilman Tröster

    ETH Zurich · Institute for Particle Physics and Astrophysics

    Affiliation as printed

    Institute for Particle Physics and Astrophysics, ETH Zürich, Wolfgang-Pauli-Strasse 27, 8093 Zürich, Switzerland