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

doi:10.1093/MNRAS/STY2271

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 journal › Article › peer-review

22 Scopus citations

Abstract

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(Ω_m/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 language	English (US)
Pages (from-to)	5529-5549
Number of pages	21
Journal	Monthly Notices of the Royal Astronomical Society
Volume	480
Issue number	4
DOIs	https://doi.org/10.1093/MNRAS/STY2271
State	Published - 2018
Externally published	Yes

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

Cosmological parameters
Cosmology: observations
Gravitational lensing: weak
Surveys

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10.1093/MNRAS/STY2271

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Giblin, B., Heymans, C., Harnois-Déraps, J., Simpson, F., Dietrich, J. P., Waerbeke, L. V., Amon, A., Asgari, M., Erben, T., Hildebrandt, H., Joachimi, B., Kuijken, K., Martinet, N., Schneider, P., & Tröster, T. (2018). KiDS-450: Enhancing cosmic shear with clipping transformations. Monthly Notices of the Royal Astronomical Society, 480(4), 5529-5549. https://doi.org/10.1093/MNRAS/STY2271

@article{6f9590c547fc41debccb4b29ac09d2c2,

title = "KiDS-450: Enhancing cosmic shear with clipping transformations",

abstract = "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.",

keywords = "Cosmological parameters, Cosmology: observations, Gravitational lensing: weak, Surveys",

author = "Benjamin Giblin and Catherine Heymans and Joachim Harnois-D{\'e}raps and Fergus Simpson and Dietrich, {J{\"o}rg P.} and Waerbeke, {Ludovic Van} and Alexandra Amon and Marika Asgari and Thomas Erben and Hendrik Hildebrandt and Benjamin Joachimi and Konrad Kuijken and Nicolas Martinet and Peter Schneider and Tilman Tr{\"o}ster",

note = "Publisher Copyright: {\textcopyright} 2018 The Author(s).",

year = "2018",

doi = "10.1093/MNRAS/STY2271",

language = "English (US)",

volume = "480",

pages = "5529--5549",

journal = "Monthly Notices of the Royal Astronomical Society",

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publisher = "Oxford University Press",

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Giblin, B, Heymans, C, Harnois-Déraps, J, Simpson, F, Dietrich, JP, Waerbeke, LV, Amon, A, Asgari, M, Erben, T, Hildebrandt, H, Joachimi, B, Kuijken, K, Martinet, N, Schneider, P & Tröster, T 2018, 'KiDS-450: Enhancing cosmic shear with clipping transformations', Monthly Notices of the Royal Astronomical Society, vol. 480, no. 4, pp. 5529-5549. https://doi.org/10.1093/MNRAS/STY2271

TY - JOUR

T1 - KiDS-450

T2 - Enhancing cosmic shear with clipping transformations

AU - Giblin, Benjamin

AU - Heymans, Catherine

AU - Harnois-Déraps, Joachim

AU - Simpson, Fergus

AU - Dietrich, Jörg P.

AU - Waerbeke, Ludovic Van

AU - Amon, Alexandra

AU - Asgari, Marika

AU - Erben, Thomas

AU - Hildebrandt, Hendrik

AU - Joachimi, Benjamin

AU - Kuijken, Konrad

AU - Martinet, Nicolas

AU - Schneider, Peter

AU - Tröster, Tilman

PY - 2018

Y1 - 2018

N2 - 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.

AB - 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.

KW - Cosmological parameters

KW - Cosmology: observations

KW - Gravitational lensing: weak

KW - Surveys

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

KiDS-450: Enhancing cosmic shear with clipping transformations

Abstract

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