Adaptive Grid Lens Modeling of the Cosmic Horseshoe Using Hubble Space Telescope Imaging

Adaptive Grid Lens Modeling of the Cosmic Horseshoe Using Hubble Space Telescope Imaging
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使用哈勃太空望远镜成像的宇宙马蹄形自适应网格透镜建模

DOI:
10.3847/1538-4357/ab0029
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发表时间:
2019-02
影响因子:
4.9
通讯作者:
Li Guoliang
Li Guoliang
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Cheng Jun;Wiesner Matthew P;Peng En Hsin;Cui Wei;Peterson John R;Li Guoliang

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宇宙马蹄形引力透镜系统是强引力透镜的一个非凡的例子,这是由于在这个系统中形成了几乎完整的爱因斯坦环,以及透镜z = 2.38的莱曼破裂星系的恒星形成性质。在本文中,我们描述了一个新的透镜建模包的开发和透镜模型产生的哈勃空间望远镜成像。我们新的透镜建模包使用自适应网格方法,特别是基于Vegetti和Koopmans描述的算法。新的透镜建模包引入了K均值方法来处理多个背景源。我们利用两个参数化模型,奇异等温椭球和Navarro-Frenk-白色模型,以优化贝叶斯罚函数。颜色图显示爱因斯坦环中存在两种不同的颜色,这表明宇宙马蹄铁是由两个背景星系或一个高度不规则的星系形成的。我们发现,最佳的透镜模型包括两个组件和爱因斯坦环内的总质量。背景源的重建显示在源平面上有两个峰值,当比较轴比和位置角时,最可能的透镜轮廓与前景星系的光轮廓一致。
The Cosmic Horseshoe gravitational lensing system is an extraordinary example of strong gravitational lensing both due to the nearly complete Einstein ring formed in this system and due to the star-forming nature of the lensed z = 2.38 Lyman-break galaxy. In this paper, we describe the development of a new lens modeling package and the lens models produced using the Hubble Space Telescope imaging. Our new lens modeling package uses adaptive grid methods, based especially on the algorithm described by Vegetti & Koopmans. The new lens modeling package introduces the K-means method to deal with multiple background sources. We utilize two parameterized models, the singular isothermal ellipsoid and the Navarro–Frenk–White model in order to optimize the Bayesian penalty function. Color–color diagrams show two distinct colors exist in the Einstein ring, which suggests that the Cosmic Horseshoe is formed from two background galaxies or from a highly irregular galaxy. We find that the best lens model includes two components and the total mass within the Einstein ring is . The background source reconstruction shows two peaks in the source plane and the most probable lens profile is consistent with the light profile of the foreground galaxy when comparing axis ratios and position angles.
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