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

By Catherine Heymans, T. Troster, M. Asgari, C. Blake, H. Hildebrandt, B. Joachimi, K. Kuijken, Chieh-An Lin, Ariel G. Sánchez, J. L. V. D. Busch and 21 more. Astronomy & Astrophysics, 2020

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We present a joint cosmological analysis of weak gravitational lensing observations from the Kilo-Degree Survey (KiDS-1000), with redshift-space galaxy clustering observations from the Baryon Oscillation Spectroscopic Survey (BOSS) and galaxy-galaxy lensing observations from the overlap between KiDS-1000, BOSS, and the spectroscopic 2-degree Field Lensing Survey. This combination of large-scale structure probes breaks the degeneracies between cosmological parameters for individual observables, resulting in a constraint on the structure growth parameter S8 = σ8√(Ωm/0.3) = 0.766−0.014+0.020, which has the same overall precision as that reported by the full-sky cosmic microwave background observations from Planck. The recovered S8 amplitude is low, however, by 8.3 ± 2.6% relative to Planck. This result builds from a series of KiDS-1000 analyses where we validate our methodology with variable depth mock galaxy surveys, our lensing calibration with image simulations and null-tests, and our optical-to-near-infrared redshift calibration with multi-band mock catalogues and a spectroscopic-photometric clustering analysis. The systematic uncertainties identified by these analyses are folded through as nuisance parameters in our cosmological analysis. Inspecting the offset between the marginalised posterior distributions, we find that the S8-difference with Planck is driven by a tension in the matter fluctuation amplitude parameter, σ8. We quantify the level of agreement between the cosmic microwave background and our large-scale structure constraints using a series of different metrics, finding differences with a significance ranging between ∼3σ, when considering the offset in S8, and ∼2σ, when considering the full multi-dimensional parameter space.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/1bf58c69e2c37e6c322de191da961acbc400db2b

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Citations in the corpus

The DESI Bright Galaxy Survey: Final Target Selection, Design, and Validation (2022, methodology): “…approaches to measuring the growth of structure, including the use of galaxy groups and clusters (Mohammad et al. 2016), galaxy–galaxy weak lensing (Heymans et al. 2021; Miyatake et al. 2022; Abbott et al. 2022; Amon et al. 2022), higher-order statistics (GilMarín et al. 2017), small-scale…”
hmcode-2020: improved modelling of non-linear cosmological power spectra with baryonic feedback (2020, background): “…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) and Lawrence et al.…”
The Ups and Downs of Early Dark Energy solutions to the Hubble tension: A review of models, hints and constraints circa 2023 (2023, methodology): “In fact, the combination of KiDS data with BOSS and 2dFLenS data leads to a 3σ lower value than Planck, and points to a σ8-tension rather than discrepancies in Ωm [220].”
Measurements of the E -mode polarization and temperature- E -mode correlation of the CMB from SPT-3G 2018 data (2021, unknown): “from the Kilo-Degree Survey (KiDS) [70], 0.”
The Atacama Cosmology Telescope: DR6 Gravitational Lensing Map and Cosmological Parameters (2023, methodology): “We show constraints from the ‘3 × 2 pt’ DES-Y3 cosmology results (Abbott et al. 2022), the KiDS-1000 3 × 2 pt analysis (Heymans et al. 2021) and the HSC-Y3 galaxy lensing Fourier-space (Dalal et al. 2023) and Real-space analyses (Li et al. 2023).”
The Atacama Cosmology Telescope: A Measurement of the DR6 CMB Lensing Power Spectrum and Its Implications for Structure Growth (2023, methodology): “…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; Dalal et al. 2023),…”