Observable properties of strong gravitational lenses
Observable properties of strong gravitational lenses
复制标题
强引力透镜的可观测特性
DOI：
10.1051/0004-6361/201629947
复制
发表时间：
2016
影响因子：
6.5
通讯作者：
N. Tessore
中科院分区：
文献类型：
--
作者：
N. Tessore
它示出了一个强引力透镜的属性，原则上可以从多个扩展图像的观察时，没有假设的偏转器或源恢复。个别多个图像之间的映射被确定为载体的重力透镜的信息，它示出了如何可以从一个假设的观察提取此信息。图像映射的导数包含关于多个图像的区域上的收敛比和减少的剪切的信息。对于两个观测图像，不可能同时重建收敛比和剪切。对于三个观察到的图像，它是可能的，以恢复收敛比和减少剪切相同。对于四个或更多的观测图像，约束系统是超定的，但理论上可以恢复相同的量。
It is shown which properties of a strong gravitational lens can in principle be recovered from observations of multiple extended images when no assumptions are made about the deflector or sources. The mapping between individual multiple images is identified as the carrier of information about the gravitational lens and it is shown how this information can be extracted from a hypothetical observation. The derivatives of the image map contain information about convergence ratios and reduced shears over the regions of the multiple images. For two observed images, it is not possible to reconstruct the convergence ratio and shear at the same time. For three observed images, it is possible to recover the convergence ratios and reduced shears identically. For four or more observed images, the system of constraints is overdetermined, but the same quantities can theoretically be recovered.