KiDS-450: cosmological parameter constraints from tomographic weak gravitational lensing

By H. Hildebrandt, M. Viola, Catherine Heymans, S. Joudaki, K. Kuijken, C. Blake, T. Erben, B. Joachimi, D. Klaes, L. Miller and 26 more. 2016

807 citations recorded by the source corpus.

We present cosmological parameter constraints from a tomographic weak gravitational lensing analysis of ~450deg$^2$ of imaging data from the Kilo Degree Survey (KiDS). For a flat $\Lambda$CDM cosmology with a prior on $H_0$ that encompasses the most recent direct measurements, we find $S_8\equiv\sigma_8\sqrt{\Omega_{\rm m}/0.3}=0.745\pm0.039$. This result is in good agreement with other low redshift probes of large scale structure, including recent cosmic shear results, along with pre-Planck cosmic microwave background constraints. A $2.3$-$\sigma$ tension in $S_8$ and `substantial discordance' in the full parameter space is found with respect to the Planck 2015 results. We use shear measurements for nearly 15 million galaxies, determined with a new improved `self-calibrating' version of $lens$fit validated using an extensive suite of image simulations. Four-band $ugri$ photometric redshifts are calibrated directly with deep spectroscopic surveys. The redshift calibration is confirmed using two independent techniques based on angular cross-correlations and the properties of the photometric redshift probability distributions. Our covariance matrix is determined using an analytical approach, verified numerically with large mock galaxy catalogues. We account for uncertainties in the modelling of intrinsic galaxy alignments and the impact of baryon feedback on the shape of the non-linear matter power spectrum, in addition to the small residual uncertainties in the shear and redshift calibration. The cosmology analysis was performed blind. Our high-level data products, including shear correlation functions, covariance matrices, redshift distributions, and Monte Carlo Markov Chains are available at http://kids.strw.leidenuniv.nl.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/a027a8715ef1dfa16dc36b63f7997e59e52041fd

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Citations in the corpus

KiDS-450 + 2dFLenS: Cosmological parameter constraints from weak gravitational lensing tomography and overlapping redshift-space galaxy clustering (2017, methodology): “…we have developed a self-consistent Markov Chain Monte Carlo (MCMC) fitting pipeline in COSMOMC (Lewis & Bridle 2002), which is an extension of the pipeline used in the cosmic shear analyses of CFHTLenS (Joudaki et al. 2017a) and KiDS-450 (Hildebrandt et al. 2017; Joudaki et al. 2017b).”
Massive optimal data compression and density estimation for scalable, likelihood-free inference in cosmology (2018, background): “…and cosmic microwave background (CMB) measurements of the amplitude of matter clustering (Ade et al. 2016; Joudaki et al. 2016; Alsing et al. 2016; Hildebrandt et al. 2017) and local versus CMB measurements of the Hubble constant (Riess et al. 2011; Ade et al. 2016; Feeney et al. 2017), it is…”
Lensing is Low: Cosmology, Galaxy Formation, or New Physics? (2016, methodology): “Green contours represent contours from the KiDS cosmic shear analysis of Hildebrandt et al. (2017).”
Alleviating the H0 and σ8 anomalies with a decaying dark matter model (2019, neutral): “039 from KiDS-450 [13] weak-lensing surveys.”
Dark energy, α-attractors, and large-scale structure surveys (2017, background): “(CFHTLenS) [73, 74], the Kilo Degree Survey (KiDS) [75, 76], the Extended Baryon Oscillation Spectroscopic Survey (eBOSS) [77], and the Dark Energy Survey (DES) [78–80].”
KiDS+GAMA : cosmology constraints from a joint analysis of cosmic shear, galaxy-galaxy lensing, and angular clustering (2017, methodology): “Even though the sum of the neutrino masses is known to be non-zero, we adopt the same prior as Hildebrandt et al. (2017) and fix it to zero.”
The Hubble tension in light of the Full-Shape analysis of Large-Scale Structure data (2020, methodology): “They have found that upon adding to the combination of the Planck and SH0ES data other LSS data sets, such as for example BAO [66] or the DES [67] and KiDS [68] data, or Supernovae, the tension in the Hubble parameter is still persistent and”
Cosmology from cosmic shear power spectra with Subaru Hyper Suprime-Cam first-year data (2018, methodology): “Our result for S8 is smaller than the DES results by 0.5σ and larger than the KiDS results by 1σ or 2σ for the CF and QE estimators.”