Role of the companion lensing galaxy in the CLASS gravitational lens B1152+199
Role of the companion lensing galaxy in the CLASS gravitational lens B1152+199
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伴星透镜星系在 CLASS 引力透镜 B1152 199 中的作用
DOI：
10.1093/mnras/stac087
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发表时间：
2022-02
影响因子：
4.8
通讯作者：
L. Zhang
中科院分区：
文献类型：
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作者：
M. Zhang;Q. Yuan;J.-Y. Liu;L. Zhang
我们使用存档的哈勃太空望远镜 (HST) 数据和甚长基线干涉测量 (VLBI) 数据重新研究宇宙透镜全天巡天 (CLASS) 引力透镜 B1152+199。从 HST 三波段图像中测量到主星系和 X 星系之间有效半径内一致的光度比，这导致两个星系之间的质量比为 asrb∼2。为了确定 X 星系在透镜系统中的作用，我们在 VLBI 解析的射流组件和 HST 图像的约束下对双透镜系统进行了建模。 8.4 GHz 全球 VLBI 数据目前为质量模型提供了最严格的约束，尤其是径向幂律斜率。这种两图像三分量无线电透镜的优化模型有利于比等温内斜率更陡的。还研究了图像 B 中的射流弯曲，结果证明它是未对准而不是曲率。拟合优度表明，如果要安装三对解析射流组件，X 星系在透镜系统中的作用至关重要。当我们将无线电约束的最优模型导入到HST三波段数据的光学建模中时，优化保持了最优模型的一致性，并成功地再现了HST图像中观察到的特征。这意味着在 HST 图像中发现的漫射发射实际上是对来自配对透镜的二次透镜效应的检测。
We reinvestigate the Cosmic Lens All-Sky Survey (CLASS) gravitational lens B1152+199 using archivedHubble Space Telescope(HST) data and Very Long Baseline Interferometry (VLBI) data. A consistent luminosity ratio within effective radius between the host galaxy and the X-galaxy is measured fromHSTtri-band images, which leads to a mass ratio between the two galaxies asrb∼ 2. To determine the role of the X-galaxy in the lens system, we modelled the dual-lens system with constraints from the VLBI-resolved jet components and theHSTimages. The 8.4-GHz global-VLBI data currently provide the most stringent constraints to the mass model, especially to the radial power-law slope. The optimized models for this two-image three-component radio lens favour a steeper-than-isothermal inner slope. The jet bending in image B was also investigated and it turned out to be rather a misalignment than a curvature. The goodness-of-fit indicates that the role of the X-galaxy is crucial in the lens system if three pairs of resolved jet components are to be fitted. When we imported the optimal model from radio constraints to optical modelling with theHSTtri-band data, the optimization kept the consistency of the optimal model and successfully reproduced the features observed in theHSTimages. This implies that the diffuse emission discovered in theHSTimages is actually a detection of the secondary lensing effects from the companion lens.
DOI：
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发表时间：
2021
期刊：
--
影响因子：
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作者：
F. Kottlowski;E. J. Workman;Alvln J. Thompson;Robert W. Botts
通讯作者：
F. Kottlowski;E. J. Workman;Alvln J. Thompson;Robert W. Botts