KiDS+VIKING-450: Cosmic shear tomography with optical+infrared data

Abstract

We present a tomographic cosmic shear analysis of the Kilo-Degree Survey (KiDS) combined with the VISTA Kilo-Degree Infrared Galaxy Survey (VIKING). This is the first time that a full optical to near-infrared data set has been used for a wide-field cosmological weak lensing experiment. This unprecedented data, spanning $450$deg${}^2$, allows us to improve significantly the estimation of photometric redshifts, such that we are able to include robustly higher-redshift sources for the lensing measurement, and - most importantly - solidify our knowledge of the redshift distributions of the sources. Based on a flat $\Lambda$CDM model we find $S_8\equiv {\sigma }_8\sqrt{{\Omega }_{\mathrm{m}}/0.3}=0.737_{-0.036}^{+0.040}$ in a blind analysis from cosmic shear alone. The tension between KiDS cosmic shear and the Planck-Legacy CMB measurements remains in this systematically more robust analysis, with $S_8$ differing by $2.3\sigma$. This result is insensitive to changes in the priors on nuisance parameters for intrinsic alignment, baryon feedback, and neutrino mass. KiDS shear measurements are calibrated with a new, more realistic set of image simulations and no significant B-modes are detected in the survey, indicating that systematic errors are under control. When calibrating our redshift distributions by assuming the 30-band COSMOS-2015 photometric redshifts are correct (following the Dark Energy Survey and the Hyper Suprime-Cam Survey), we find the tension with Planck is alleviated. The robust determination of source redshift distributions remains one of the most challenging aspects for future cosmic shear surveys.

arXiv comment31 pages, 14 figures, accepted for publication by A&A; data products available at http://kids.strw.leidenuniv.nl

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• Cosmological constraints on mass-varying dark matter
• Forecasting the potential of weak lensing magnification to enhance LSST large-scale structure analyses
• Dark Energy Survey Year 3 results: Cosmology with peaks using an emulator approach
• Effect of dust in circumgalactic haloes on the cosmic shear power spectrum
• Cosmological implications of the full shape of anisotropic clustering measurements in BOSS and eBOSS
• Self-similarity of the mass distribution in rich galaxy clusters up z~1 tracked with weak lensing
• Reconstructing spatially-varying multiplicative bias for Stage IV weak lensing galaxy surveys with a quadratic estimator
• Insights in $f(Q)$ cosmology: the relevance of the connection
• Halo spin and orientation in Interacting Dark Matter Dark Energy Cosmology