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KiDS-450: enhancing cosmic shear with clipping transformations

Giblin, B, Heymans, C, Harnois-Déraps, J, Simpson, F, Dietrich, JP, Van Waerbeke, L, Amon, A, Asgari, M, Erben, T, Hildebrandt, H, Joachimi, B, Kuijken, K, Martinet, N, Schneider, P and Tröster, T (2018) KiDS-450: enhancing cosmic shear with clipping transformations. Monthly Notices of the Royal Astronomical Society, 480 (4). pp. 5529-5549. ISSN 0035-8711

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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 = σ8(Ωm/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.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 the Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press (OUP)
Date Deposited: 22 Jul 2020 09:09
Last Modified: 04 Sep 2021 06:57
DOI or ID number: 10.1093/mnras/sty2271
URI: https://researchonline.ljmu.ac.uk/id/eprint/13338
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