爱因斯坦环1 RXS J1131-1231的非透镜HST观测：贝叶斯分析
Unlensing HST Observations of the Einstein Ring 1RXS J1131-1231: A Bayesian Analysis
摘要：
我们给出了光学爱因斯坦环引力透镜系统RXS J1131-1231的光源和透镜重建。我们解决细节的来源，这是一个$z=0.658$类星体的宿主星系，到0.045角秒的分辨率（这是最小的最终解决结构的大小，而不是像素尺度），使用贝叶斯技术与先验信息的现实模型。源重建揭示了宿主星系中大量的复杂结构，其范围为$\sim$ 8 kpc，包含几个明亮的紧凑子结构，类星体源位于其中一个明亮的子结构中。此外，我们恢复透镜星系的质量分布，假设一个简单的参数化模型，使用类星体图像和扩展图像的信息。这允许直接比较类星体图像与扩展图像提供的关于透镜的信息量。在这个系统中，我们发现，扩展的图像提供了显着更多的信息透镜比单独的类星体图像，特别是如果我们不包括事先约束的中心位置的镜头。
英文摘要：
We present a source and lens reconstruction for the optical Einstein ring gravitational lens system RXS J1131-1231. We resolve detail in the source, which is the host galaxy of a $z=0.658$ quasar, down to a resolution of 0.045 arc seconds (this is the size of the smallest conclusively resolved structures, rather than the pixel scale), using a Bayesian technique with a realistic model for the prior information. The source reconstruction reveals a substantial amount of complex structure in the host galaxy, which is $\sim$ 8 kpc in extent and contains several bright compact substructures, with the quasar source residing in one of these bright substructures. Additionally, we recover the mass distribution of the lensing galaxy, assuming a simply-parameterised model, using information from both the quasar images and the extended images. This allows a direct comparison of the amount of information about the lens that is provided by the quasar images in comparison to the extended images. In this system, we find that the extended images provide significantly more information about the lens than the quasar images alone, especially if we do not include prior constraints on the central position of the lens.
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