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The Sunyaev-Zel'dovich Array: Constraining a new pressure profile for fitting SZE observations of galaxy clusters.

机译:Sunyaev-Zel'dovich阵列:约束新的压力剖面,以拟合星系团的SZE观测值。

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摘要

The Sunyaev-Zel'dovich Array (SZA), an eight element interferometer designed to probe the Sunyaev-Zel'dovich effect (SZE) from galaxy clusters, which I helped construct and operate, is described here (Part I). I then use SZA observations to investigate the utility of a new, self-similar pressure profile for fitting SZE observations of galaxy clusters (Part II).;The parameters derived from the joint fit to SZE+X-ray data agree well with a detailed, independent, X-ray-only analysis of these same clusters. When combined with X-ray imaging data, this new pressure profile yields an independent estimate of the electron temperature profile that is in good agreement with spectroscopic X-ray determinations. In addition to yielding relationships between cluster observables and physical cluster properties, this model could prove to be a useful tool in helping to constrain the temperatures of high redshift clusters, for which X-ray spectroscopic data are difficult to obtain.;The SZA 30-GHz receiver system probes angular scales ∼1-5'. A model that can accurately describe a cluster's pressure profile over a correspondingly broad range of radii is therefore required. In the analysis presented here, I fit a 2-parameter, radial pressure profile, derived from simulations and detailed X-ray analysis of relaxed clusters, to SZA observations of three clusters with exceptionally high quality X-ray data. From the joint analysis of the SZE and X-ray data, I derive physical properties of the cluster, such as gas and total mass, gas fraction and the integrated Compton y -parameter.
机译:此处介绍了八角干涉仪Sunyaev-Zel'dovich阵列(SZA),该干涉仪旨在探测星系团中的Sunyaev-Zel'dovich效应(SZE),这是我帮助构建和操作的(第一部分)。然后,我使用SZA观测来研究一种新的,自相似压力分布图对拟合星系团SZE观测(第二部分)的实用性。从联合拟合SZE + X射线数据得出的参数与详细,对这些相同簇的独立,仅X射线分析。当与X射线成像数据结合时,此新的压力曲线将产生电子温度曲线的独立估计值,该估计值与X射线光谱测定法相吻合。除了可以在团簇可观测物和物理团簇属性之间产生关系外,该模型还可以证明是有助于限制难以获得X射线光谱数据的高红移团簇温度的有用工具。SZA30- GHz接收器系统探测的角度刻度约为1-5'。因此,需要一个能够在相应的较大半径范围内准确描述群集压力分布的模型。在这里介绍的分析中,我将2个参数的径向压力曲线拟合到SZA观测中,这些2个参数是从对松弛星团进行的模拟和详细X射线分析得出的,这些SZA观测到三个星团的X射线质量非常高。从SZE和X射线数据的联合分析中,我得出了团簇的物理特性,例如气体和总质量,气体分数以及集成的Compton y参数。

著录项

  • 作者

    Mroczkowski, Tony.;

  • 作者单位

    Columbia University.;

  • 授予单位 Columbia University.;
  • 学科 Physics Astronomy and Astrophysics.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 191 p.
  • 总页数 191
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:38:25

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