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An analytic ray-tracing algorithm for weak lensing

Li, B.; King, L.J.; Zhao, G.; Zhao, H.

An analytic ray-tracing algorithm for weak lensing Thumbnail


Authors

L.J. King

G. Zhao

H. Zhao



Abstract

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.

Journal Article Type Article
Publication Date Jul 21, 2011
Deposit Date Jan 20, 2012
Publicly Available Date May 1, 2014
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 415
Issue 1
Pages 881-892
DOI https://doi.org/10.1111/j.1365-2966.2011.18754.x
Keywords Gravitational lensing: weak, Methods: analytical, Methods: numerical, Cosmology: theory, Large-scale structure of Universe.
Public URL https://durham-repository.worktribe.com/output/1499655

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Copyright 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.






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