Substructure and the cusp and fold relations
Substructure and the cusp and fold relations
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DOI：
10.1111/j.1365-2966.2006.10991.x
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发表时间：
2006-05
影响因子：
4.8
通讯作者：
A. Aazami;P. Natarajan
中科院分区：
文献类型：
--
作者：
A. Aazami;P. Natarajan
背景源被前景星系透镜引力透镜化，偶尔会产生四个源的图像。尖点和折叠关系对这些四像透镜的放大率施加了条件。在这一理论研究中，我们探讨了这些关系的灵敏度的存在下，在透镜的子结构。从一个光滑的透镜潜力，我们添加了不同量的子结构，同时保持源位置固定，并发现折叠关系是一个更强大的指标的子结构比尖点关系的图像。这种鲁棒性与子结构的详细空间分布无关，也与透镜势的椭圆度和外部剪切的存在无关。
Gravitational lensing of a background source by a foreground galaxy lens occasionally produces four images of the source. The cusp and the fold relations impose conditions on the ratios of magnifications of these four-image lenses. In this theoretical investigation, we explore the sensitivity of these relations to the presence of substructure in the lens. Starting with a smooth lens potential, we add varying amounts of substructure, while keeping the source position fixed, and find that the fold relation is a more robust indicator of substructure than the cusp relation for the images. This robustness is independent of the detailed spatial distribution of the substructure, as well as of the ellipticity of the lensing potential and the presence of external shear.