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arXiv 1101.0372astro-ph.COastro-ph.IM
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Sunyaev-Zel'dovich阵列:约束一个新的压力剖面,用于拟合星系团的SZE观测

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

Tony Mroczkowski

摘要:

Sunyaev-Zel'dovich阵列(SZA)是一个八元件干涉仪,旨在探测来自星系团的Sunyaev-Zel'dovich效应(SZE),我帮助建造和操作了它,这里描述了它(第一部分)。然后,我使用SZA观测调查的效用,一个新的,自相似的压力分布拟合SZE观测的星系团(第二部分)。SZA 30-GHz接收机系统探测角标度~1- 5 '。因此,需要一个能够准确描述在相应的宽半径范围内的星团压力分布的模型。在这里提出的分析中,我适合一个2参数,径向压力分布,来自模拟和详细的X射线分析的放松集群,SZA观测的三个集群异常高质量的X射线数据。从SZE和X射线数据的联合分析中,我得到了星系团的物理性质,如气体和总质量,气体分数和积分康普顿y参数。从联合拟合SZE+ X射线数据得出的参数与这些相同簇的详细的、独立的、仅X射线分析吻合得很好。当与X射线成像数据相结合时,这种新的压力分布产生与光谱X射线测定良好一致的电子温度分布的独立估计。除了产生集群观测值和物理集群属性之间的关系,这个模型可以证明是一个有用的工具,在帮助限制高红移集群,其中X射线光谱数据是很难获得的温度。

英文摘要:

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 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. 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.

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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