THE CLUSTER LENSING AND SUPERNOVA SURVEY WITH HUBBLE: AN OVERVIEW
THE CLUSTER LENSING AND SUPERNOVA SURVEY WITH HUBBLE: AN OVERVIEW
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DOI：
10.1088/0067-0049/199/2/25
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发表时间：
2011-06
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通讯作者：
M. Postman;D. Coe;N. Benı́tez;L. Bradley;T. Broadhurst;M. Donahue;H. Ford;O. Graur;G. Graves-G.-G
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文献类型：
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作者：
M. Postman;D. Coe;N. Benı́tez;L. Bradley;T. Broadhurst;M. Donahue;H. Ford;O. Graur;G. Graves-G.-G
哈勃星系团透镜和超新星调查（CLASH）是一个524轨道多周期财政计划，利用25个星系团的引力透镜特性来精确地约束它们的质量分布。本文详细描述的这项调查将确定星系团核心暗物质的集中程度，这是预测结构形成模型的关键。与目前类似深度的星系团空间成像研究样本相比，CLASH星系团样本更大，偏差更小，因为我们已经最小化了基于透镜的选择，这种选择倾向于具有过于密集核心的系统。具体来说，20个碰撞星系团完全是x射线选择的。x射线选择的星团质量很大（kT bbb50 keV），并且在大多数情况下是动态放松的。另外5个星团因其透镜强度（θEin bbb35″at zs = 2）而被包括在内，以优化发现高度放大的高z （z bbb7）星系的可能性。总共有16个宽带滤光片，跨越近紫外到近红外，用于每个星团上的每20个轨道运动。这些数据用于测量新发现弧线的精确（σz ~ 0.02(1 + z)）光度红移。每个星团的观测分布在8个时期，以便在z > 1寻找Ia型超新星，以改善暗能量状态方程和超新星演化的时间依赖性约束。我们给出了新的重新导出的碰撞星团的x射线亮度、温度和铁丰度，以及MACS1149.6+2223 （z = 0.544）的代表性源列表。
The Cluster Lensing And Supernova survey with Hubble (CLASH) is a 524-orbit Multi-Cycle Treasury Program to use the gravitational lensing properties of 25 galaxy clusters to accurately constrain their mass distributions. The survey, described in detail in this paper, will definitively establish the degree of concentration of dark matter in the cluster cores, a key prediction of structure formation models. The CLASH cluster sample is larger and less biased than current samples of space-based imaging studies of clusters to similar depth, as we have minimized lensing-based selection that favors systems with overly dense cores. Specifically, 20 CLASH clusters are solely X-ray selected. The X-ray-selected clusters are massive (kT > 5 keV) and, in most cases, dynamically relaxed. Five additional clusters are included for their lensing strength (θEin > 35″ at zs = 2) to optimize the likelihood of finding highly magnified high-z (z > 7) galaxies. A total of 16 broadband filters, spanning the near-UV to near-IR, are employed for each 20-orbit campaign on each cluster. These data are used to measure precise (σz ∼ 0.02(1 + z)) photometric redshifts for newly discovered arcs. Observations of each cluster are spread over eight epochs to enable a search for Type Ia supernovae at z > 1 to improve constraints on the time dependence of the dark energy equation of state and the evolution of supernovae. We present newly re-derived X-ray luminosities, temperatures, and Fe abundances for the CLASH clusters as well as a representative source list for MACS1149.6+2223 (z = 0.544).