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An analytic ray-tracing algorithm for weak lensing.

Li, B. and King, L. J. and Zhao, G. and Zhao, H. (2011) 'An analytic ray-tracing algorithm for weak lensing.', Monthly notices of the Royal Astronomical Society., 415 (1). pp. 881-892.


We propose a new ray-tracing algorithm to measure the weak-lensing shear and convergence fields directly from N-body simulations. We calculate the deflection of the light rays lensed by the 3D mass density field or gravitational potential along the line of sight on a grid-by-grid basis, rather than using the projected 2D lens planes. Our algorithm uses simple analytic formulae instead of numerical integrations in the computation of the projected density field along the line of sight, and so is computationally efficient and straightforward to implement. This will prove valuable in the interpretation of data from the next generation of surveys that will image many thousands of square degrees of sky.

Item Type:Article
Keywords:Gravitational lensing: weak, Methods: analytical, Methods: numerical, Cosmology: theory, Large-scale structure of Universe.
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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:No date available
Date deposited:01 May 2014
Date of first online publication:July 2011
Date first made open access:No date available

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