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arXiv 1605.08784astro-ph.GA
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CLASH星系团MACS 2129的精确强透镜质量剖面

Precise strong lensing mass profile of the CLASH galaxy cluster MACS 2129

A. Monna, S. Seitz, I. Balestra, P. Rosati, C. Grillo, A. Halkola, S. H. Suyu, D. Coe, G. B. Caminha, B. Frye, A. Koekemoer, A. Mercurio, M. Nonino, M. Postman, A. Zitrin

摘要:

我们提出了一个详细的强透镜(SL)的质量重建的核心的星系团MACSJ 2129.4-0741($\rm z_{cl}=0.589$)相结合的高分辨率HST测光从CLASH调查新的光谱观测CLASH-VLT调查。背景是$\rm z_{sp}=1.36$的亮红色被动星系,在星团核心有六倍透镜,在三个星团中心成员上方有四个径向透镜图像。另外19个背景透镜星系的光谱证实了我们的VLT调查,包括3个额外的多系统。在透镜效应分析中总共使用了31个多图像。这使我们能够高精度地追踪星系团内部区域的总质量分布($\rm R<100$ kpc)。我们最终的透镜质量模型再现了多个图像系统中确定的集群核心与高精度的$0.4"$。这转化为MACS 2129的高精度质量重建,其被限制在2%的水平。这个星系团有爱因斯坦参数$Θ_E=(29\pm4)"$,在这个半径范围内的投影总质量为$\rm M_{tot}(<Θ_E)=(1.35\pm0.03)\times 10^{14}M_{\odot}$。除了星系团的质量分布,我们还提供了完整的星系团成员光谱数据集和CLASH-VLT巡天中VLT/VIMOS测量的透镜图像。

英文摘要:

We present a detailed strong lensing (SL) mass reconstruction of the core of the galaxy cluster MACSJ 2129.4-0741 ($\rm z_{cl}=0.589$) obtained by combining high-resolution HST photometry from the CLASH survey with new spectroscopic observations from the CLASH-VLT survey. A background bright red passive galaxy at $\rm z_{sp}=1.36$, sextuply lensed in the cluster core, has four radial lensed images located over the three central cluster members. Further 19 background lensed galaxies are spectroscopically confirmed by our VLT survey, including 3 additional multiple systems. A total of 31 multiple images are used in the lensing analysis. This allows us to trace with high precision the total mass profile of the cluster in its very inner region ($\rm R<100$ kpc). Our final lensing mass model reproduces the multiple images systems identified in the cluster core with high accuracy of $0.4"$. This translates to an high precision mass reconstruction of MACS 2129, which is constrained at level of 2%. The cluster has Einstein parameter $Θ_E=(29\pm4)"$, and a projected total mass of $\rm M_{tot}(<Θ_E)=(1.35\pm0.03)\times 10^{14}M_{\odot}$ within such radius. Together with the cluster mass profile, we provide here also the complete spectroscopic dataset for the cluster members and lensed images measured with VLT/VIMOS within the CLASH-VLT survey.

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