KiDS-1000 catalogue: Weak gravitational lensing shear measurements

Journal article

We investigate the inclusion of clustering maps in a weak lensing Minkowski functional (MF) analysis of DES-like and LSST-like simulations to constrain cosmological parameters. The standard 3x2pt approach to lensing and clustering data uses two-point correlations as its primary statistic; MFs, morphological statistics describing the shape of matter fields, provide additional information for non- Gaussian fields. Previous analyses have studied MFs of lensing convergence maps; in this project we explore their simultaneous application to clustering maps. We employ a simplified linear galaxy bias model, and using a lognormal curved sky measurement and Monte Carlo Markov Chain (MCMC) sampling process for parameter inference, we find that MFs do not yield any information in the Ωm – σ8 plane not already generated by a 3x2pt analysis. However, we expect that MFs should improve constraining power when nonlinear baryonic and other small-scale effects are taken into account. As with a 3x2pt analysis, we find a significant improvement to constraints when adding clustering data to MF-only and MF+C` shear measurements, and strongly recommend future higher order statistics be measured from both convergence and clustering maps.ISSN:2565-612

Authors: Giblin, B; Heymans, C; Asgari, M; Hildebrandt, H; Hoekstra, H

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: EDP Sciences
• Journal: Astronomy & Astrophysics
• Volume: 645
• Pages: A105-A105
• Publication date: 2020-11-25
• Acceptance date: 2020-10-13
• DOI: 10.1051/0004-6361/202038850
• EISSN: 1432-0746
• ISSN: 0004-6361
• Language: English