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The distribution of dark and luminous matter in the unique galaxy cluster merger Abell 2146.

机译:独特的星系团合并Abell 2146中暗物质和发光物质的分布。

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摘要

Abell 2146 (z = 0.232) consists of two galaxy clusters undergoing a major merger. The system was discovered in previous work, where two large shock fronts were detected using the Chandra X-ray Observatory, consistent with a merger close to the plane of the sky, caught soon after first core passage. A weak gravitational lensing analysis of the total gravitating mass in the system, using the distorted shapes of distant galaxies seen with ACS-WFC on Hubble Space Telescope, is presented. The highest peak in the reconstruction of the projected mass is centred on the Brightest Cluster Galaxy (BCG) in Abell 2146-A. The mass associated with Abell 2146-B is more extended. Bootstrapped noise mass reconstructions show the mass peak in Abell 2146-A to be consistently centred on the BCG. Previous work showed that BCG-A appears to lag behind an X-ray cool core; although the peak of the mass reconstruction is centred on the BCG, it is also consistent with the X-ray peak given the resolution of the weak lensing mass map. The best-fit mass model with two components centred on the BCGs yields M200 = 1.1×1015 M⊙ and 3[Math Processing Error]×1014 M⊙ for Abell 2146-A and Abell 2146-B respectively, assuming a mass concentration parameter of c = 3.5 for each cluster. From the weak lensing analysis, Abell 2146-A is the primary halo component, and the origin of the apparent discrepancy with the X-ray analysis where Abell 2146-B is the primary halo is being assessed using simulations of the merger.
机译:阿贝尔2146(z = 0.232)由经历重大合并的两个星系团组成。该系统是在先前的工作中发现的,该系统使用钱德拉X射线天文台探测到两个大的震波前沿,这与在第一次岩心通过后不久捕获到的靠近天空平面的合并一致。利用哈勃太空望远镜在ACS-WFC上观测到的遥远星系的变形形状,对系统中的总引力进行了弱引力透镜分析。投影质量重建中的最高峰集中在Abell 2146-A中最亮的星系星系(BCG)上。与Abell 2146-B相关的质量更加扩大。自举噪声质量重建显示Abell 2146-A中的质量峰始终以BCG为中心。先前的工作表明,BCG-A似乎落后于X射线冷核。尽管质量重建的峰集中在BCG上,但考虑到弱透镜质量图的分辨率,它也与X射线峰一致。假设质量浓度参数为每个群集的c = 3.5。从弱镜头分析来看,Abell 2146-A是主要的光环成分,并且使用合并模拟来评估X射线分析(Abell 2146-B是主要的光环)与表观差异的起源。

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