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Gravitational lensing analysis of the Kilo-Degree Survey

Kuijken, K, Heymans, C, Hildebrandt, H, Nakajima, R, Erben, T, de Jong, JTA, Viola, M, Choi, A, Hoekstra, H, Miller, L, van Uitert, E, Amon, A, Blake, C, Brouwer, M, Buddendiek, A, Conti, IF, Eriksen, M, Grado, A, Harnois-Déraps, J, Helmich, E , Herbonnet, R, Irisarri, N, Kitching, T, Klaes, D, La Barbera, F, Napolitano, N, Radovich, M, Schneider, P, Sifón, C, Sikkema, G, Simon, P, Tudorica, A, Valentijn, E, Verdoes Kleijn, G and van Waerbeke, L (2015) Gravitational lensing analysis of the Kilo-Degree Survey. Monthly Notices of the Royal Astronomical Society, 454 (4). pp. 3500-3532. ISSN 0035-8711

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Abstract

The Kilo-Degree Survey (KiDS) is a multi-band imaging survey designed for cosmological studies from weak lensing and photometric redshifts. It uses the European Southern Observatory VLT Survey Telescope with its wide-field camera OmegaCAM. KiDS images are taken in four filters similar to the Sloan Digital Sky Survey ugri bands. The best seeing time is reserved for deep r-band observations. The median 5σ limiting AB magnitude is 24.9 and the median seeing is below 0.7 arcsec. Initial KiDS observations have concentrated on the Galaxy and Mass Assembly (GAMA) regions near the celestial equator, where extensive, highly complete redshift catalogues are available. A total of 109 survey tiles, 1 square degree each, form the basis of the first set of lensing analyses of halo properties of GAMA galaxies. Nine galaxies per square arcminute enter the lensing analysis, for an effective inverse shear variance of 69 arcmin−2. Accounting for the shape measurement weight, the median redshift of the sources is 0.53. KiDS data processing follows two parallel tracks, one optimized for weak lensing measurement and one for accurate matched-aperture photometry (for photometric redshifts). This technical paper describes the lensing and photometric redshift measurements (including a detailed description of the Gaussian aperture and photometry pipeline), summarizes the data quality and presents extensive tests for systematic errors that might affect the lensing analyses. We also provide first demonstrations of the suitability of the data for cosmological measurements, and describe our blinding procedure for preventing confirmation bias in the scientific analyses. The KiDS catalogues presented in this paper are released to the community through http://kids.strw.leidenuniv.nl.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2015 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: 24 Jul 2020 10:26
Last Modified: 24 Jul 2020 10:30
DOI or Identification number: 10.1093/mnras/stv2140
URI: https://researchonline.ljmu.ac.uk/id/eprint/13364

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