KiDS+GAMA : cosmology constraints from a joint analysis of cosmic shear, galaxy-galaxy lensing, and angular clustering

By E. V. Uitert, B. Joachimi, S. Joudaki, Catherine Heymans, F. Kohlinger, M. Asgari, C. Blake, A. Choi, T. Erben, D. Farrow and 12 more. 2017

160 citations recorded by the source corpus.

We present cosmological parameter constraints from a joint analysis of three cosmological probes: the tomographic cosmic shear signal in ˜450 deg2 of data from the Kilo Degree Survey (KiDS), the galaxy-matter cross-correlation signal of galaxies from the Galaxies And Mass Assembly (GAMA) survey determined with KiDS weak lensing, and the angular correlation function of the same GAMA galaxies. We use fast power spectrum estimators that are based on simple integrals over the real-space correlation functions, and show that they are practically unbiased over relevant angular frequency ranges. We test our full pipeline on numerical simulations that are tailored to KiDS and retrieve the input cosmology. By fitting different combinations of power spectra, we demonstrate that the three probes are internally consistent. For all probes combined, we obtain S_8≡ σ _8 √{Ω _m/0.3}=0.800_{-0.027}^{+0.029}, consistent with Planck and the fiducial KiDS-450 cosmic shear correlation function results. Marginalising over wide priors on the mean of the tomographic redshift distributions yields consistent results for S8 with an increase of 28% in the error. The combination of probes results in a 26% reduction in uncertainties of S8 over using the cosmic shear power spectra alone. The main gain from these additional probes comes through their constraining power on nuisance parameters, such as the galaxy intrinsic alignment amplitude or potential shifts in the redshift distributions, which are up to a factor of two better constrained compared to using cosmic shear alone, demonstrating the value of large-scale structure probe combination.

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Citations in the corpus

Cluster Cosmology Constraints from the 2500 deg2 SPT-SZ Survey: Inclusion of Weak Gravitational Lensing Data from Magellan and the Hubble Space Telescope (2018, methodology): “…from Planck (TT+lowTEB) and from combined analyses of cosmic shear, galaxy–galaxy lensing, and galaxy clustering from the Kilo Degree Survey and the Galaxies And Mass Assembly survey (KiDS+GAMA; van Uitert et al. 2018) and the Dark Energy Survey (DES) Year 1 results (Abbott et al. 2018).”
Cosmology from cosmic shear power spectra with Subaru Hyper Suprime-Cam first-year data (2018, result): “Our constraints on S8 agree with other recent cosmic shear analysis results (Hildebrandt et al. 2017; Köhlinger et al. 2017; Troxel et al. 2018) as well as results of extended analyses including galaxy-galaxy lensing (DES Collaboration et al. 2017; van Uitert et al. 2018; Yoon et al. 2018).”
Core Cosmology Library: Precision Cosmological Predictions for LSST (2018, background): “Current weak lensing surveys, such as the Dark Energy Survey1 and the Kilo-Degree Survey2, have started to take this approach already (Joudaki et al. 2018; van Uitert et al. 2018; DES Collaboration et al. 2017; Krause et al. 2017).”
The fourth data release of the Kilo-Degree Survey: ugri imaging and nine-band optical-IR photometry over 1000 square degrees (2019, background): “Though designed for the primary cosmology science case (KiDS450; Joudaki et al. 2017; van Uitert et al. 2018; Köhlinger et al. 2017; Harnois-Déraps et al. 2017; Amon et al. 2018; Shan et al. 2018; Martinet et al. 2018; Giblin et al. 2018; Asgari et al. 2019), KiDS data are also being used for a…”
KiDS+VIKING-450: Cosmic shear tomography with optical and infrared data (2018, methodology): “As in van Uitert et al. (2018), we update the covariance model with the best-fit cosmology of our fiducial run and repeat the parameter inference (setup no. 26 in Tables 5 and 6).”
PICO: Probe of Inflation and Cosmic Origins (2019, background): “6σ discrepancy between the CMB- and local-Universe-anchored supernovaebased measurements of the Hubble constant [37, 132]; the identification of lack of correlations at large angles in the T T power spectrum that has an apparent probability of less than 10−3 of occurrence in standard ΛCDM [133]; and”
Interacting dark energy in the early 2020s: A promising solution to the H0 and cosmic shear tensions (2019, background): “However, other analyses show no tension, or only a mild amount of tension: these include for instance a combination of KiDS and GAMA galaxy clustering [119], a re-analysis of KiDS after accounting for a more careful treatment of intrinsic galaxy shape noise, multiplicative shear calibration uncertai”