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

By H. Hildebrandt, F. Köhlinger, J. L. V. D. Busch, B. Joachimi, Catherine Heymans, A. Kannawadi, A. Wright, M. Asgari, C. Blake, H. Hoekstra and 18 more. Astronomy & Astrophysics, 2018

282 citations recorded by the source corpus.

We present a tomographic cosmic shear analysis of the Kilo-Degree Survey (KiDS) combined with the VISTA Kilo-Degree Infrared Galaxy Survey. 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 deg2, allows us to significantly improve the estimation of photometric redshifts, such that we are able to include robustly higher-redshift sources for the lensing measurement, and – most importantly – to solidify our knowledge of the redshift distributions of the sources. Based on a flat ΛCDM model we find S8 ≡ σ8 Ωm/0.3 = 0.737+0.040−0.036 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 S8 differing by 2.3σ. 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.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/5125b9659b6a7a65c877918a46be6210a6ed94aa

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

Citations in the corpus

Euclid preparation (2021, methodology): “…spectroscopic sources by allowing a maximum angular separation of 0′′.3 in the match between the KiDS-VIKING+450 and VVDS/DEEP2 catalogues. redshift range of interest 0.1 < z < 1.2, with magnitude limits similar to those used for the KiDS+VIKING-450 cosmic shear analysis (Hildebrandt et al. 2020).”
KiDS+VIKING-450 and DES-Y1 combined: Cosmology with cosmic shear (2019, methodology): “5% for all current surveys (Hildebrandt et al. 2020, hereafter H20; Troxel et al. 2018, hereafter T18; Hikage et al. 2019; Joudaki et al. 2017; Jee et al. 2016).”
hmcode-2020: improved modelling of non-linear cosmological power spectra with baryonic feedback (2020, background): “…range of the emulators is too tight to 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…”
Early Dark Energy can Resolve the Hubble Tension. (2018, background): “For example, the tension with the most recent KiDS cosmic-shear measurement [64] increases from 2.”
Validation of the Scientific Program for the Dark Energy Spectroscopic Instrument (2023, background): “RSD data complement recent weak lensing measurements (e.g., Mandelbaum et al. 2018; Hik-age et al. 2019; Hildebrandt et al. 2020; Joachimi et al. 2021; Abbott et al. 2022a) by offering constraints on the gravitational infall of matter over cosmological scales.”
The fourth data release of the Kilo-Degree Survey: ugri imaging and nine-band optical-IR photometry over 1000 square degrees (2019, methodology): “These near-infrared data do not form part of KiDS-DR4, but they are incorporated in the calibration of the photometric redshifts for the KV450 analysis in Hildebrandt et al. (2018).”