New Multiply-Lensed Galaxies Identified in ACS/NIC3 Observations of Cl0024+1654, Using an Improved Mass Model
New Multiply-Lensed Galaxies Identified in ACS/NIC3 Observations of Cl0024+1654, Using an Improved Mass Model
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DOI：
10.1111/j.1365-2966.2009.14899.x
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发表时间：
2009-02
影响因子：
4.8
通讯作者：
A. Zitrin;T. Broadhurst;K. Umetsu;D. Coe;N. Ben'itez;B. Ascaso;L. Bradley;H. Ford;J. Jee
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文献类型：
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作者：
A. Zitrin;T. Broadhurst;K. Umetsu;D. Coe;N. Ben'itez;B. Ascaso;L. Bradley;H. Ford;J. Jee
利用深空哈勃望远镜（HST）/高级巡天照相机（ACS）/NIC 3图像，基于11个背景星系的33幅多重透镜图像，对Cl 0024 +1654（z = 0.39）进行了改进的强透镜分析。这些都是通过一个模型发现的，该模型假设质量近似于光的轨迹，具有低阶膨胀以允许大尺度上的灵活性。该模型最初由众所周知的五图像系统（z = 1.675）约束，并随着使用该模型识别新的多透镜系统而细化。这些新系统的测光红移，然后使用约束更好地通过采用红移和透镜距离之间的标准宇宙学关系的质量分布。我们的模型只需要六个自由参数来描述所有的位置和红移数据。由此产生的内部质量分布的斜率为d log M/ dl ogr − 0.55，与新的弱透镜测量结果一致，其中数据重叠，r = 200 kpc/h70。组合曲线与高浓度Navarro，Frenk &白色（NFW）质量曲线拟合良好，Cvir为8.6 ± 1.6，
We present an improved strong-lensing analysis of Cl0024+1654 (z = 0.39) using deep Hubble Space Telescope (HST)/Advanced Camera for Surveys (ACS)/NIC3 images, based on 33 multiply-lensed images of 11 background galaxies. These are found with a model that assumes mass approximately traces light, with a low-order expansion to allow for flexibility on large scales. The model is constrained initially by the well-known five-image system (z = 1.675) and refined as new multiply-lensed systems are identified using the model. Photometric redshifts of these new systems are then used to constrain better the mass profile by adopting the standard cosmological relation between redshift and lensing distance. Our model requires only six free parameters to describe well all positional and redshift data. The resulting inner mass profile has a slope of d log M/ dl ogr �− 0.55, consistent with new weak-lensing measurements where the data overlap, at r � 200 kpc/h70. The combined profile is well fitted by a high-concentration Navarro, Frenk & White (NFW) mass profile, Cvir ∼ 8.6 ± 1.6,