KiDS-1000 Cosmology: Multi-probe weak gravitational lensing and spectroscopic galaxy clustering constraints

Catherine Heymans, Tilman Tröster, Marika Asgari, Chris Blake, Hendrik Hildebrandt, Benjamin Joachimi, Konrad Kuijken, Chieh-An Lin, Ariel G. Sánchez, Jan Luca van den Busch, Angus H. Wright, Alexandra Amon, Maciej Bilicki, Jelte de Jong, Martin Crocce, Andrej Dvornik, Thomas Erben, Maria Cristina Fortuna, Fedor Getman, Benjamin GiblinKarl Glazebrook, Henk Hoekstra, Shahab Joudaki, Arun Kannawadi, Fabian Köhlinger, Chris Lidman, Lance Miller, Nicola R. Napolitano, David Parkinson, Peter Schneider, HuanYuan Shan, Edwin Valentijn, Gijs Verdoes Kleijn, Christian Wolf

Research output: Contribution to journalArticlepeer-review


We present a joint cosmological analysis of weak gravitational lensing observations from the Kilo-Degree Survey (KiDS-1000), withredshift-space galaxy clustering observations from the Baryon Oscillation Spectroscopic Survey (BOSS) and galaxy-galaxy lensingobservations from the overlap between KiDS-1000, BOSS, and the spectroscopic 2-degree Field Lensing Survey (2dFLenS). Thiscombination of large-scale structure probes breaks the degeneracies between cosmological parameters for individual observables,resulting in a constraint on the structure growth parameterS8=σ8√Ωm/0.3=0.766+0.020−0.014, which has the same overall precision asthat reported by the full-sky cosmic microwave background observations fromPlanck. The recoveredS8amplitude is low, however,by8.3±2.6%relative toPlanck. This result builds from a series of KiDS-1000 analyses where we validate our methodology withvariable depth mock galaxy surveys, our lensing calibration with image simulations and null-tests, and our optical-to-near-infraredredshift calibration with multi-band mock catalogues and a spectroscopic-photometric clustering analysis. The systematic uncertain-ties identified by these analyses are folded through as nuisance parameters in our cosmological analysis. Inspecting the offset betweenthe marginalised posterior distributions, we find that theS8-difference withPlanckis driven by a tension in the matter fluctuationamplitude parameter,σ8. We quantify the level of agreement between the cosmic microwave background and our large-scale structureconstraints using a series of different metrics, finding differences with a significance ranging between∼3σ, when considering theoffset inS8, and∼2σ, when considering the full multi-dimensional parameter space
Original languageEnglish
Article numberA140
Number of pages25
JournalAstronomy and Astrophysics
Publication statusPublished - 19 Feb 2021


  • astro-ph.CO


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