A Unified Analysis of Four Cosmic Shear Surveys

Abstract

In the past few years, several independent collaborations have presented cosmological constraints from tomographic cosmic shear analyses. These analyses differ in many aspects: the datasets, the shear and photometric redshift estimation algorithms, the theory model assumptions, and the inference pipelines. To assess the robustness of the existing cosmic shear results, we present in this paper a unified analysis of four of the recent cosmic shear surveys: the Deep Lens Survey (DLS), the Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS), the Science Verification data from the Dark Energy Survey (DES-SV), and the 450 deg${}^2$ release of the Kilo-Degree Survey (KiDS-450). By using a unified pipeline, we show how the cosmological constraints are sensitive to the various details of the pipeline. We identify several analysis choices that can shift the cosmological constraints by a significant fraction of the uncertainties. For our fiducial analysis choice, considering a Gaussian covariance, conservative scale cuts, assuming no baryonic feedback contamination, identical cosmological parameter priors and intrinsic alignment treatments, we find the constraints (mean, 16% and 84% confidence intervals) on the parameter $S_8\equiv {\sigma }_8({\Omega }_{\mathrm{m}}/0.3{)}^{0.5}$ to be $S_8=0.94_{-0.045}^{+0.046}$ (DLS), $0.66_{-0.071}^{+0.070}$ (CFHTLenS), $0.84_{-0.061}^{+0.062}$ (DES-SV) and $0.76_{-0.049}^{+0.048}$ (KiDS-450). From the goodness-of-fit and the Bayesian evidence ratio, we determine that amongst the four surveys, the two more recent surveys, DES-SV and KiDS-450, have acceptable goodness-of-fit and are consistent with each other. The combined constraints are $S_8=0.79_{-0.041}^{+0.042}$, which is in good agreement with the first year of DES cosmic shear results and recent CMB constraints from the Planck satellite.

arXiv comment22 pages, 15 figures, 7 tables; submitted to MNRAS

References in corpus (66)

• MultiNest: an efficient and robust Bayesian inference tool for cosmology and particle physics
• Weak Gravitational Lensing
• Stable clustering, the halo model and nonlinear cosmological power spectra
• Dark Energy Survey Year 1 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing
• Bayesian photometric redshift estimation
• Revising the Halofit Model for the Nonlinear Matter Power Spectrum
• The Dark Energy Camera
• KiDS-450: Cosmological parameter constraints from tomographic weak gravitational lensing
• Why your model parameter confidences might be too optimistic -- unbiased estimation of the inverse covariance matrix
• CFHTLenS: The Canada-France-Hawaii Telescope Lensing Survey
• Dark Energy Survey Year 1 Results: Cosmological Constraints from Cosmic Shear
• CFHTLenS tomographic weak lensing cosmological parameter constraints: Mitigating the impact of intrinsic galaxy alignments
• Detection of weak gravitational lensing distortions of distant galaxies by cosmic dark matter at large scales
• First Data Release of the Hyper Suprime-Cam Subaru Strategic Program
• Detection of Weak Gravitational Lensing by Large-scale Structure
• Intrinsic alignment-lensing interference as a contaminant of cosmic shear
• The Shear TEsting Programme 1: Weak lensing analysis of simulated ground-based observations
• Dark energy constraints from cosmic shear power spectra: impact of intrinsic alignments on photometric redshift requirements
• Bayesian Galaxy Shape Measurement for Weak Lensing Surveys - III. Application to the Canada-France-Hawaii Telescope Lensing Survey
• Extended Limber Approximation
• Gravitational Lensing Analysis of the Kilo Degree Survey
• An accurate halo model for fitting non-linear cosmological power spectra and baryonic feedback models
• CFHTLenS: The Canada-France-Hawaii Telescope Lensing Survey - Imaging Data and Catalogue Products
• Very weak lensing in the CFHTLS Wide: Cosmology from cosmic shear in the linear regime
• Systematic Errors in Future Weak Lensing Surveys: Requirements and Prospects for Self-Calibration
• Weak lensing for precision cosmology
• CFHTLenS: Combined probe cosmological model comparison using 2D weak gravitational lensing
• The PRIsm MUlti-Object Survey (PRIMUS) I: Survey Overview and Characteristics
• Cosmological Model Predictions for Weak Lensing: Linear and Nonlinear Regimes
• CosmoSIS: modular cosmological parameter estimation
• CFHTLenS: Improving the quality of photometric redshifts with precision photometry
• KiDS-450 + 2dFLenS: Cosmological parameter constraints from weak gravitational lensing tomography and overlapping redshift-space galaxy clustering
• The first and second data releases of the Kilo-Degree Survey
• Power Spectrum Super-Sample Covariance
• CosmoLike - Cosmological Likelihood Analyses for Photometric Galaxy Surveys
• CFHTLenS revisited: assessing concordance with Planck including astrophysical systematics
• Accurate halo-model matter power spectra with dark energy, massive neutrinos and modified gravitational forces
• Bayesian Galaxy Shape Measurement for Weak Lensing Surveys -I. Methodology and a Fast Fitting Algorithm
• Parameter inference with estimated covariance matrices
• KiDS+GAMA: Cosmology constraints from a joint analysis of cosmic shear, galaxy-galaxy lensing and angular clustering
• Constraints on intrinsic alignment contamination of weak lensing surveys using the MegaZ-LRG sample
• Analysis of two-point statistics of cosmic shear: I. Estimators and covariances
• Concordance and Discordance in Cosmology
• The Effect of Covariance Estimator Error on Cosmological Parameter Constraints
• Estimating the Redshift Distribution of Faint Galaxy Samples
• KiDS-450: Testing extensions to the standard cosmological model
• Power Spectrum Covariance of Weak Gravitational Lensing
• The DES Science Verification Weak Lensing Shear Catalogues
• Simulations of Wide-Field Weak Lensing Surveys I: Basic Statistics and Non-Gaussian Effects
• Cosmology from Cosmic Shear with DES Science Verification Data
• GREAT3 results I: systematic errors in shear estimation and the impact of real galaxy morphology
• Redshift distributions of galaxies in the DES Science Verification shear catalogue and implications for weak lensing
• Calibration of weak-lensing shear in the Kilo-Degree Survey
• Precision calculations of the cosmic shear power spectrum projection
• Cosmic shear results from the deep lens survey - I: Joint constraints on omega_m and sigma_8 with a two-dimensional analysis
• Dark Energy Survey Year 1 Results: Multi-Probe Methodology and Simulated Likelihood Analyses
• Bayesian evidence as a tool for comparing datasets
• Cosmic Shear Measurements with DES Science Verification Data
• Cosmic Shear Results from the Deep Lens Survey - II: Full Cosmological Parameter Constraints from Tomography
• Survey geometry and the internal consistency of recent cosmic shear measurements
• Cosmological discordances II: Hubble constant, Planck and large-scale-structure data sets
• Towards Precision LSST Weak-Lensing Measurement - I: Impacts of Atmospheric Turbulence and Optical Aberration
• Using neural networks to estimate redshift distributions. An application to CFHTLenS
• An Implementation of Bayesian Lensing Shear Measurement
• CFHTLenS and RCSLenS: Testing Photometric Redshift Distributions Using Angular Cross-Correlations with Spectroscopic Galaxy Surveys
• A Unified Analysis of Four Cosmic Shear Surveys

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• Dark Energy Survey Year 3 Results: Cosmological Constraints from Galaxy Clustering and Weak Lensing
• KiDS-1000 Cosmology: Multi-probe weak gravitational lensing and spectroscopic galaxy clustering constraints
• Cosmology from cosmic shear power spectra with Subaru Hyper Suprime-Cam first-year data
• New physics in light of the $H_0$ tension: an alternative view
• Dark Energy Survey Year 3 Results: Cosmology from Cosmic Shear and Robustness to Data Calibration
• Dark Energy Survey Year 3 Results: Cosmology from Cosmic Shear and Robustness to Modeling Uncertainty
• KiDS+VIKING-450 and DES-Y1 combined: Cosmology with cosmic shear
• DES Y3 + KiDS-1000: Consistent cosmology combining cosmic shear surveys
• KiDS-1000 Cosmology: constraints beyond flat $\Lambda$CDM
• Dark Energy Survey Year 1 Results: Constraints on Intrinsic Alignments and their Colour Dependence from Galaxy Clustering and Weak Lensing
• Cosmic Shear Cosmology Beyond 2-Point Statistics: A Combined Peak Count and Correlation Function Analysis of DES-Y1
• Euclid Preparation IV. Impact of undetected galaxies on weak-lensing shear measurements
• Tomographic galaxy clustering with the Subaru Hyper Suprime-Cam first year public data release
• Dark Energy Survey Year 1 Results: Joint Analysis of Galaxy Clustering, Galaxy Lensing, and CMB Lensing Two-point Functions
• A Unified Analysis of Four Cosmic Shear Surveys
• Advances in Constraining Intrinsic Alignment Models with Hydrodynamic Simulations
• Unveiling the Intrinsic Alignment of Galaxies with Self-Calibration and DECaLS DR3 data
• Cannibalism hinders growth: Cannibal Dark Matter and the $S_8$ tension
• The integrated 3-point correlation function of cosmic shear
• New perspectives on the BOSS small-scale lensing discrepancy for the Planck $\Lambda$CDM Cosmology
• Lensing-like tensions in the Planck legacy release
• Dark Energy Survey internal consistency tests of the joint cosmological probes analysis with posterior predictive distributions
• WFIRST: The Essential Cosmology Space Observatory for the Coming Decade
• A Unified Catalog-level Reanalysis of Stage-III Cosmic Shear Surveys
• Astrophysical Tests of Dark Matter Self-Interactions
• KiDS-1000: cross-correlation with Planck cosmic microwave background lensing and intrinsic alignment removal with self-calibration
• DESI Legacy Imaging Surveys Data Release 9: Cosmological Constraints from Galaxy Clustering and Weak Lensing using the Minimal Bias Model
• Testing the accuracy of 3D-HST photometric redshift estimates as reference samples for deep weak lensing studies
• Role of the Hubble Scale in the Weak Lensing vs. CMB Tension
• Separating the Intrinsic Alignment Signal and the Lensing Signal using Self-Calibration in Photo-z Surveys with KiDS450 and KV450 Data
• The catalog-to-cosmology framework for weak lensing and galaxy clustering for LSST
• Combining cosmic shear data with correlated photo-$z$ uncertainties: constraints from DESY1 and HSC-DR1
• Non-parametric Cosmology with Cosmic Shear
• Cosmological consequences of intrinsic alignments super-sample covariance
• The Impact of Tomographic Redshift Bin Width Errors on Cosmological Probes
• Semi-parametric Bernstein-von Mises in Linear Inverse Problems
• Cosmic Shear in Harmonic Space from the Dark Energy Survey Year 1 Data: Compatibility with Configuration Space Results