arXiv 1507.039922015-07astro-ph.CO

前沿领域：合并星系团A2744的斯巴鲁弱透镜分析

Frontier Fields: Subaru Weak-Lensing Analysis of the Merging Galaxy Cluster A2744

Elinor Medezinski, Keiichi Umetsu, Nobuhiro Okabe, Mario Nonino, Sandor Molnar, Richard Massey, Renato Dupke, Julian Merten

备注：: 17 pages, 10 figures, 6 tables; ApJ accepted version; Textual edits, minor clarifications and some discussion added
DOI：: 10.3847/0004-637X/817/1/24

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摘要：

我们提出了一个弱透镜分析的合并{ \em前沿领域}（FF）集群Abell~2744使用新的斯巴鲁/Suprime-Cam成像。宽场透镜质量分布揭示了这个星系团由四个不同的子结构组成。同时建模的二维约化剪切场使用的Navarro-弗伦克-怀特（NFW）模型的主核心和截断NFW模型的subhalos的组合，我们确定他们的质量和位置。系统的总质量被约束为$M_\mathrm{200c} = (2.06\pm0.42)\times10^{15}\,M_\odot$。最大的团块是南部的$M_\mathrm{200c} = (7.7\pm3.4)\times10^{14}\,M_\odot$，其次是西部的子结构（$M_\mathrm{200c} = (4.5\pm2.0)\times10^{14}\,M_\odot$）和东北（$M_\mathrm{200c} = (2.8\pm1.6)\times10^{14}\,M_\odot$）和西北（$M_\mathrm{200c} = (1.9\pm1.2)\times10^{14}\,M_\odot$）的两个较小的子结构。四个子结构的存在支持了多重合并的图景。使用复合流体动力学二元模拟，我们解释了这个复杂的系统，而不需要一个“弹弓”效应产生西北X射线闯入者，如前所述。在西北和西部的暗晕中，子结构的位置似乎与气体（$87^{+34}_{-28}$ arcsec，90\% CL）和星系（$72^{+34}_{-53}$ arcsec，90\% CL）都有偏移。为了证实或反驳这些发现，高分辨率的天基观测扩展到目前的FF有限的覆盖范围以外的西部和西北部地区是必不可少的。

英文摘要：

We present a weak-lensing analysis of the merging {\em Frontier Fields} (FF) cluster Abell~2744 using new Subaru/Suprime-Cam imaging. The wide-field lensing mass distribution reveals this cluster is comprised of four distinct substructures. Simultaneously modeling the two-dimensional reduced shear field using a combination of a Navarro--Frenk--White (NFW) model for the main core and truncated NFW models for the subhalos, we determine their masses and locations. The total mass of the system is constrained as $M_\mathrm{200c} = (2.06\pm0.42)\times10^{15}\,M_\odot$. The most massive clump is the southern component with $M_\mathrm{200c} = (7.7\pm3.4)\times10^{14}\,M_\odot$, followed by the western substructure ($M_\mathrm{200c} = (4.5\pm2.0)\times10^{14}\,M_\odot$) and two smaller substructures to the northeast ($M_\mathrm{200c} = (2.8\pm1.6)\times10^{14}\,M_\odot$) and northwest ($M_\mathrm{200c} = (1.9\pm1.2)\times10^{14}\,M_\odot$). The presence of the four substructures supports the picture of multiple mergers. Using a composite of hydrodynamical binary simulations we explain this complicated system without the need for a "slingshot" effect to produce the northwest X-ray interloper, as previously proposed. The locations of the substructures appear to be offset from both the gas ($87^{+34}_{-28}$ arcsec, 90\% CL) and the galaxies ($72^{+34}_{-53}$ arcsec, 90\% CL) in the case of the northwestern and western subhalos. To confirm or refute these findings, high resolution space-based observations extending beyond the current FF limited coverage to the west and northwestern area are essential.

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