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Strong lens mass modeling and background galaxy reconstruction for the Abell 1689 galaxy cluster.

机译：Abell 1689星系团的强镜头质量建模和背景星系重建。

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摘要

One of the greatest quandaries in modern cosmology is understanding the nature of dark matter. Although not visibly observable, dark matter influences the evolution of the universe through its empirical gravitational effects. As a result, gravitational lensing is the only unambiguous method of accurately measuring this matter independently of its type, symmetry, and dynamical state. As the most massive, recently formed, bound structures in the universe, galaxy clusters retain information about their formation history (Bradac et al., 2004) and possess a dynamic time scale on the order of the age of the universe. Therefore, galaxy clusters are the ideal cosmological laboratories for constraining cosmology, exploring the nature of dark matter, and testing theories of formation and evolution of structures (Xue & Wu, 2002; Ghigna et al., 1998; Andersson & Madejski, 2004).; For this thesis, software has been developed to provide a precise and efficient method of modeling cluster lenses without assumptions relating the large scale cluster dark matter to the observed light. The wide-field images of the Abell 1689 cluster obtained by the HST Advanced Camera for Surveys (ACS) reveal numerous strongly lensed galaxies. With this plethora of strongly lensed images as constraints, a robust cluster mass model can be derived using a freely varying cluster large-scale halo component derived from a perturbed cuspy profile (Navarro, Frenk, & White, 1997) as well as a component based on the cluster galaxy light. Monte Carlo simulations are also performed to explore constraints on cosmology and to better understand the modeling systematics related to the image positional errors, multiple image system dependence, as well as the WMAP cosmological constraints.; Finally, the combined resolution and sensitivity provided by ACS imaging in conjunction with the amplification by the cluster gravitational lensing provide the detail necessary for the robust cluster modeling and exploration of the high-redshift universe through detailed source reconstruction. In particular, the lens magnification of high-redshift galaxies propels their images into the observation range, producing a high-resolution view of the distant universe which is normally beyond observability except under circumstances such as these.
机译：现代宇宙学中最大的难题之一就是了解暗物质的本质。尽管不是可见的，但暗物质通过其经验引力效应影响宇宙的演化。结果，引力透镜法是唯一独立于其类型，对称性和动态状态准确测量该物质的明确方法。作为宇宙中最庞大的，最近形成的，受约束的结构，星系团保留有关其形成历史的信息（Bradac等，2004），并具有与宇宙年龄有关的动态时标。因此，星系团簇是约束宇宙学，探索暗物质的性质以及测试结构形成和演化理论的理想宇宙实验室（Xue＆Wu，2002； Ghigna等，1998； Andersson＆Madejski，2004）。 ;对于本论文，已经开发了软件，以提供一种精确有效的聚类透镜建模方法，而无需假设大型聚类暗物质与观察到的光相关。由HST高级测量照相机（ACS）获得的Abell 1689星团的宽视场图像显示出许多强镜头的星系。将大量的强镜头图像作为约束，可以使用自由变化的簇大规模光晕分量（从扰动的cuspy轮廓（Navarro，Frenk和White，1997）以及基于分量的分量）得出鲁棒的簇质量模型。在星系团星光上。还进行了蒙特卡洛模拟，以探索宇宙学的约束条件，并更好地理解与图像位置误差，多个图像系统的依赖性以及WMAP宇宙学约束条件有关的建模系统。最后，由ACS成像提供的组合分辨率和灵敏度，加上星团引力透镜的放大作用，提供了详细鲁棒的星团建模和通过详细的源重构探索高红移宇宙所需的细节。特别是，高红移星系的透镜放大倍数将其图像推进到观察范围内，从而产生了遥远宇宙的高分辨率视图，除非在这种情况下，否则通常无法观察到。

著录项

  • 作者

    Zekser, Kerry Capelle.;

  • 作者单位

    The Johns Hopkins University.;

  • 授予单位 The Johns Hopkins University.;
  • 学科 Physics Astronomy and Astrophysics.
  • 学位 Ph.D.
  • 年度 2006
  • 页码 225 p.
  • 总页数 225
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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