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Defining a weak lensing experiment in space.

Cropper, M. and Hoekstra, H. and Kitching, T. and Massey, R. and Amiaux, J. and Miller, L. and Mellier, Y. and Rhodes, J. and Rowe, B. and Pires, S. and Saxton, C. and Scaramella, R. (2013) 'Defining a weak lensing experiment in space.', Monthly notices of the Royal Astronomical Society., 431 (4). pp. 3103-3126.


This paper describes the definition of a typical next-generation space-based weak gravitational lensing experiment. We first adopt a set of top-level science requirements from the literature, based on the scale and depth of the galaxy sample, and the avoidance of systematic effects in the measurements which would bias the derived shear values. We then identify and categorize the contributing factors to the systematic effects, combining them with the correct weighting, in such a way as to fit within the top-level requirements. We present techniques which permit the performance to be evaluated and explore the limits at which the contributing factors can be managed. Besides the modelling biases resulting from the use of weighted moments, the main contributing factors are the reconstruction of the instrument point spread function, which is derived from the stellar images on the image, and the correction of the charge transfer inefficiency in the CCD detectors caused by radiation damage.

Item Type:Article
Keywords:Gravitational lensing: weak, Methods: statistical, Space vehicles: instruments, Cosmological parameters, Cosmology: observations.
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Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society © 2013 The Authors Published by Oxford University Press on behalf of Royal Astronomical Society. All rights reserved.
Date accepted:No date available
Date deposited:19 August 2014
Date of first online publication:June 2013
Date first made open access:No date available

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