Journal article
Susan E. Dorsher
2004
2004
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APA
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Dorsher, S. E. (2004). Using gravitational lens geometry to measure cosmological parameters.
Chicago/Turabian
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Dorsher, Susan E. “Using Gravitational Lens Geometry to Measure Cosmological Parameters” (2004).
MLA
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Dorsher, Susan E. Using Gravitational Lens Geometry to Measure Cosmological Parameters. 2004.
BibTeX Click to copy
@article{susan2004a,
title = {Using gravitational lens geometry to measure cosmological parameters},
year = {2004},
author = {Dorsher, Susan E.}
}
Abstract
We develop a technique for measuring cosmological parameters (QM and w) using gravitational lens geometry, source and lens redshifts, and the velocity dispersion of the lensing galaxy. This technique makes use of the relation SE 4 DLs where the critical radius 0 E and the one-dimensional velocity dispersion of the lensing galaxy av are observable and the angular diameter distance ratio DLS/DS is related to the source and lens redshifts Zsource and Zlens through the cosmological model. We assess the feasibility of this technique by examining the dependence of that ratio on cosmological parameters, doing a Monte Carlo simulation with a singular isothermal sphere lens galaxy, and estimating the error due to the asymmetry of real lenses. We conclude that the method is feasible with a large lens sample and a nearly circular projected mass distribution. We expect errors of less than 0.1 in QM for a flat universe with a cosmological constant and a lens sample selected so that the axial ratio f > 0.8 for each lens. Thesis Supervisor: Professor Jacqueline N. Hewitt Title: Thesis Supervisor, Department of Physics
