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KiDS-450: Enhancing cosmic shear with clipping transformations

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Original languageEnglish
Pages (from-to)5529-5549
Number of pages21
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
Early online date18 Aug 2018
Publication statusPublished - 1 Nov 2018


We present the first 'clipped' cosmic shear measurement using data from the Kilo-Degree Survey (KiDS-450). 'Clipping' transformations suppress the signal from the highest density, non-linear regions of cosmological fields. We demonstrate that these transformations improve constraints on S8 = σ8m/0.3)0.5 when used in combination with conventional two-point statistics. For the KiDS-450 data, we find that the combined measurements improve the constraints on S8 by 17 per cent, compared to shear correlation functions alone. We determine the expectation value of the clipped shear correlation function using a suite of numerical simulations, and develop methodology to mitigate the impact of masking and shot noise. Future improvements in numerical simulations and mass reconstruction methodology will permit the precise calibration of clipped cosmic shear statistics such that clipping can become a standard tool in weak-lensing analyses.

    Research areas

  • Cosmological parameters, Cosmology: observations, Gravitational lensing: weak, Surveys

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