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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/211896
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- Gravitational lensing with three-dimensional ray tracing
- Killedar, M.; Lasky, P. D.; Lewis, G. F.; Fluke, C. J.
- High-redshift sources suffer from magnification or demagnification due to weak gravitational lensing by large-scale structure. One consequence of this is that the distance-redshift relation, in wide use for cosmological tests, suffers lensing-induced scatter which can be quantified by the magnification probability distribution. Predicting this distribution generally requires a method for ray tracing through cosmological N-body simulations. However, standard methods tend to apply the multiple-thin-lens approximation. In an effort to quantify the accuracy of these methods, we develop an innovative code that performs ray tracing without the use of this approximation. The efficiency and accuracy of this computationally challenging approach can be improved by careful choices of numerical parameters; therefore, the results are analysed for the behaviour of the ray-tracing code in the vicinity of Schwarzschild and Navarro-Frenk-White lenses. Preliminary comparisons are drawn with the multiple-lens-plane ray-bundle method in the context of cosmological mass distributions for a source redshift of zs= 0.5.
- Publication type
- Journal article
- Research centre
- Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing
- Monthly Notices of the Royal Astronomical Society, Vol. 420, no. 1 (Feb 2012), pp. 155-169
- Publication year
- FOR Code(s)
- 0201 Astronomical and Space Sciences
- Cosmology theory; Gravitational lensing; Large scale structure of Universe; Numerical methods
- Publisher URL
- Copyright © 2011 The Authors. Journal copyright © 2011 Royal Astronomical Society. The accepted manuscript is reproduced in accordance with the copyright policy of the publisher. The definitive publication is available at www.interscience.wiley.com.
- Research Projects
The Commonwealth cosmology initiative: from the first objects to the cosmic web, Australian Research Council grant number DP0665574
- Full text
- Peer reviewed