CFHTLenS: the Canada-France-Hawaii Telescope Lensing Survey

• Published in: Monthly notices of the Royal Astronomical Society Vol. 427; no. 1; pp. 146 - 166
• Main Authors: Heymans, Catherine, van Waerbeke, Ludovic, Miller, Lance, Erben, Thomas, Hildebrandt, Hendrik, Hoekstra, Henk, Kitching, Thomas D., Mellier, Yannick, Simon, Patrick, Bonnett, Christopher, Coupon, Jean, Fu, Liping, Harnois-Déraps, Joachim, Hudson, Michael J., Kilbinger, Martin, Kuijken, Koenraad, Rowe, Barnaby, Schrabback, Tim, Semboloni, Elisabetta, van Uitert, Edo, Vafaei, Sanaz, Velander, Malin
• Format: Journal Article
• Language: English
• Published: Oxford, UK Blackwell Science Ltd 21-11-2012; Oxford University Press; Oxford University Press (OUP): Policy P - Oxford Open Option A
• Subjects: Astrophysics; cosmology: observations; gravitational lensing: weak; Gravity; Sciences of the Universe; Space telescopes; Hawaii; France; Canada; gravitational lensing: weak; cosmology: observations; Astrophysics - Cosmology and Nongalactic Astrophysics
• ISSN: 0035-8711; 1365-2966
• DOI: 10.1111/j.1365-2966.2012.21952.x

Abstract
We present the Canada-France-Hawaii Telescope Lensing Survey (CFHTLenS) that accurately determines a weak gravitational lensing signal from the full 154 deg2 of deep multicolour data obtained by the CFHT Legacy Survey. Weak gravitational lensing by large-scale structure is widely recognized as one of the most powerful but technically challenging probes of cosmology. We outline the CFHTLenS analysis pipeline, describing how and why every step of the chain from the raw pixel data to the lensing shear and photometric redshift measurement has been revised and improved compared to previous analyses of a subset of the same data. We present a novel method to identify data which contributes a non-negligible contamination to our sample and quantify the required level of calibration for the survey. Through a series of cosmology-insensitive tests we demonstrate the robustness of the resulting cosmic shear signal, presenting a science-ready shear and photometric redshift catalogue for future exploitation.