KiDS-450: Enhancing cosmic shear with clipping transformations

Benjamin Giblin, Catherine Heymans, Joachim Harnois-Déraps, Fergus Simpson, Jörg P. Dietrich, Ludovic Van Waerbeke, Alexandra Amon, Marika Asgari, Thomas Erben, Hendrik Hildebrandt, Benjamin Joachimi, Konrad Kuijken, Nicolas Martinet, Peter Schneider, Tilman Tröster

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)5529-5549
Number of pages21
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
StatePublished - 2018
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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


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