Model-independent and model-based local lensing properties of CL0024+1654 from multiply-imaged galaxies

Model-independent and model-based local lensing properties of CL0024+1654 from multiply-imaged galaxies
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来自多重成像星系的 CL0024 1654 的模型独立和基于模型的局部透镜特性

DOI:
10.1051/0004-6361/201731932
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发表时间:
2018
期刊:
arXiv: Cosmology and Nongalactic Astrophysics
影响因子:
--
通讯作者:
N. Tessore
N. Tessore
中科院分区:
--
文献类型:
--
作者:
J. Wagner;J. Liesenborgs;N. Tessore

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局部引力透镜性质,如收敛和剪切,在多次成像的背景物体的位置上确定,产生有价值的信息,在星系团的中心部分的小尺度透镜物质分布。像CL0024中观察到的具有分辨亮度特征的高度失真的多个图像使我们能够研究这些局部透镜性质并收紧对暗物质在子星系团尺度上的性质的约束。可以独立于CL 0024中atzs= 1.675的源的五个分辨多个图像的透镜模型来确定。我们还确定了参数建模工具Lensool和非参数建模工具Grale获得的相应结果的比较是否可以检测模型中的偏差。对于这些透镜模型,我们分析的数量和位置的影响,从多个图像上的透镜属性的位置上的五个多个图像的源atzs= 1.675.MethodsOur模型无关的方法使用的线性映射之间的五个解决的多个图像,以确定放大率,收敛率,并减少剪切在其位置。从多达六个多图像系统的约束,我们生成Lengstool和Grale模型使用相同的图像位置,宇宙学参数,和生成的收敛和剪切映射的数量,以确定本地值,f,andgat在相同的位置在所有的方法。我们发现,Lenstool获得了最严格的置信区间,即使是使用来自六个多图像系统的约束的收敛,而最好的Grale模型只使用来自所有多个图像的约束,并解决亮度功能,并添加有限的小规模质量校正。然而,置信界限一样大的值本身可以发生收敛接近一个在所有approaches.ConclusionsOur结果同意与以前的研究结果,支持轻痕迹质量假设,并合并假说CL0024。比较不同的方法可以发现模型偏差。模型无关的方法确定本地透镜属性,以可比的精度在不到一秒。
ContextLocal gravitational lensing properties, such as convergence and shear, determined at the positions of multiply imaged background objects, yield valuable information on the smaller-scale lensing matter distribution in the central part of galaxy clusters. Highly distorted multiple images with resolved brightness features like the ones observed in CL0024 allow us to study these local lensing properties and to tighten the constraints on the properties of dark matter on sub-cluster scale.AimWe investigate to what precision local magnification ratios, , ratios of convergences,f, and reduced shears,g= (g1,g2), can be determined independently of a lens model for the five resolved multiple images of the source atzs= 1.675 in CL0024. We also determine if a comparison to the respective results obtained by the parametric modelling tool Lenstool and by the non-parametric modelling tool Grale can detect biases in the models. For these lens models, we analyse the influence of the number and location of the constraints from multiple images on the lens properties at the positions of the five multiple images of the source atzs= 1.675.MethodsOur model-independent approach uses a linear mapping between the five resolved multiple images to determine the magnification ratios, ratios of convergences, and reduced shears at their positions. With constraints from up to six multiple image systems, we generate Lenstool and Grale models using the same image positions, cosmological parameters, and number of generated convergence and shear maps to determine the local values of ,f, andgat the same positions across all methods.ResultsAll approaches show strong agreement on the local values of ,f, andg. We find that Lenstool obtains the tightest confidence bounds even for convergences around one using constraints from six multiple-image systems, while the best Grale model is generated only using constraints from all multiple images with resolved brightness features and adding limited small-scale mass corrections. Yet, confidence bounds as large as the values themselves can occur for convergences close to one in all approaches.ConclusionsOur results agree with previous findings, support the light-traces-mass assumption, and the merger hypothesis for CL0024. Comparing the different approaches can detect model biases. The model-independent approach determines the local lens properties to a comparable precision in less than one second.
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