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arXiv 0801.1795astro-ph
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强透镜作用下RX J1347-1145的质量分布

The mass distribution of RX J1347-1145 from strong lensing

A. Halkola, H. Hildebrandt, T. Schrabback, M. Lombardi, M. Bradac, T. Erben, P. Schneider, D. Wuttke

摘要:

星系团RX J1347-1145的高分辨率HST/ACS图像使我们能够在星系团中识别出几个新的多图像候选者,包括一个5图像系统和一个中心图像。多个图像使我们能够构建集群中心部分的精确二维质量图。集群质量的建模包括最突出的集群星系建模为截断等温球和一个光滑的晕组件,是描述与2参数配置文件。质量重建是使用马尔可夫链蒙特卡罗方法完成的,该方法为我们提供了总投影质量密度以及对感兴趣的参数及其相应误差的估计。的质量分布是在合理的协议与以前的质量估计的基础上的X射线发射从热的星系团内气体,但X射线质量估计系统低于我们获得的引力透镜。

英文摘要:

High resolution HST/ACS images of the galaxy cluster RX J1347-1145 have enabled us to identify several new multiple image candidates in the cluster, including a 5 image system with a central image. The multiple images allow us to construct an accurate 2-dimensional mass map of the central part of the cluster. The modelling of the cluster mass includes the most prominent cluster galaxies modelled as truncated isothermal spheres and a smooth halo component that is described with 2 parametric profiles. The mass reconstruction is done using a Markov chain Monte Carlo method that provides us with a total projected mass density as well as estimates for the parameters of interest and their respective errors. The mass profile is in reasonable agreement with previous mass estimates based on the X-ray emission from the hot intra-cluster gas, however the X-ray mass estimates are systematically lower than what we obtain with gravitational lensing.

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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