Weak-Lensing Discovery and Tomography of a Cluster at z = 0.68
Weak-Lensing Discovery and Tomography of a Cluster at z = 0.68
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z = 0.68 处星团的弱透镜发现和层析成像
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
I. Dell’Antonio
中科院分区：
文献类型：
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作者：
D. Wittman;V. Margoniner;J. Tyson;J. Cohen;A. Becker;I. Dell’Antonio
我们报告的弱透镜的发现，光谱确认，和弱透镜层析成像的一个大规模的星系团在z = 0.68，表明剪切选择的集群工程在红移足够高的宇宙学有趣。在投影半径r内，弱透镜效应的质量估计值为11.1 ± 2.8 × 1014（r/Mpc）M，与光谱学的结果（σv = 980 km s-1）和一个可能是强透镜背景星系的弧的位置一致。从弱透镜层析的红移估计是一致的光谱学，证明了重子无偏质量调查的可行性。这种层析技术将能够粗略地识别任何暗星系团的红移，这些星系团可能出现在z ~ 1的剪切选择样本中。
We report the weak-lensing discovery, spectroscopic confirmation, and weak-lensing tomography of a massive cluster of galaxies at z = 0.68, demonstrating that shear selection of clusters works at redshifts high enough to be cosmologically interesting. The mass estimate from weak lensing, 11.1 ± 2.8 × 1014 (r/Mpc) M☉ within projected radius r, agrees with that derived from the spectroscopy (σv = 980 km s-1) and with the position of an arc that is likely to be a strongly lensed background galaxy. The redshift estimate from weak-lensing tomography is consistent with the spectroscopy, demonstrating the feasibility of baryon-unbiased mass surveys. This tomographic technique will be able to roughly identify the redshifts of any dark clusters that may appear in shear-selected samples up to z ~ 1.