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arXiv 1109.0932astro-ph.CO
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三维透镜作用下STAGES Abell A901/2超星系团场的空间物质密度映射

Spatial matter density mapping of the STAGES Abell A901/2 supercluster field with 3D lensing

P. Simon, C. Heymans, T. Schrabback, A. N. Taylor, M. E. Gray, L. van Waerbeke, C. Wolf, D. Bacon, M. Barden, A. Böhm, B. Häußler, K. Jahnke, S. Jogee, E. van K… 展开作者

P. Simon, C. Heymans, T. Schrabback, A. N. Taylor, M. E. Gray, L. van Waerbeke, C. Wolf, D. Bacon, M. Barden, A. Böhm, B. Häußler, K. Jahnke, S. Jogee, E. van Kampen, K. Meisenheimer, C. Y. Peng

摘要:

本文利用HST/STAGES巡天的弱透镜观测数据研究了Abell 901/902超星系团复合体中物质和星系的三维空间分布。我们的方法改进了现有的3D透镜映射技术,通过校准和消除红移偏差,并占3D结构的径向伸长的影响。我们还首次对3D透镜图进行了详细的噪声分析,结果表明,即使使用深层次的HST质量数据,也只有最大质量的结构,例如在z~0.8处的M200>~10^15 Msun/h,才能以合理的红移精度(Δz~0.15)在3D中分辨出来。我们将透镜映射与恒星质量分布进行比较,并找到了峰值显著性>3σ的所有质量峰的发光对应物。我们在z=0.165的前景超星系团内部和后面看到了结构,在z~0.6处的A901 b星系团正后方以及z~0.7处的SW群后方发现了结构。在投影中观察到的这种3D结构对A901 b或SW组成分SWa和SWb的最近质量估计没有显著影响。

英文摘要:

We present weak lensing data from the HST/STAGES survey to study the three-dimensional spatial distribution of matter and galaxies in the Abell 901/902 supercluster complex. Our method improves over the existing 3D lensing mapping techniques by calibrating and removing redshift bias and accounting for the effects of the radial elongation of 3D structures. We also include the first detailed noise analysis of a 3D lensing map, showing that even with deep HST quality data, only the most massive structures, for example M200>~10^15 Msun/h at z~0.8, can be resolved in 3D with any reasonable redshift accuracy (Δz~0.15). We compare the lensing map to the stellar mass distribution and find luminous counterparts for all mass peaks detected with a peak significance >3σ. We see structures in and behind the z=0.165 foreground supercluster, finding structure directly behind the A901b cluster at z~0.6 and also behind the SW group at z~0.7. This 3D structure viewed in projection has no significant impact on recent mass estimates of A901b or the SW group components SWa and SWb.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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