Semilinear gravitational lens inversion

被引:186
作者
Warren, SJ [1 ]
Dye, S [1 ]
机构
[1] Univ London Imperial Coll Sci Technol & Med, Blackett Lab, Astrophys Grp, London SW7 2BW, England
关键词
gravitational lensing;
D O I
10.1086/375132
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We describe a new method for analyzing gravitational lens images, for the case in which the source light distribution is pixelized. The method is suitable for high-resolution, high signal-to-noise ratio (S/N) data of a multiply imaged extended source. For a given mass distribution, we show that the step of inverting the image to obtain the deconvolved pixelized source light distribution, and the uncertainties, is a linear one. This means that the only parameters of the nonlinear problem are those required to model the mass distribution. This greatly simplifies the search for a minimum chi(2) fit to the data and speeds up the inversion. The method is extended in a straightforward way to include linear regularization. We apply the method to simulated Einstein ring images and demonstrate the effectiveness of the inversion for both the unregularized and regularized cases.
引用
收藏
页码:673 / 682
页数:10
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