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Constraints on cluster structure and cosmology from X-ray and Sunyaev-Zel'dovich effect properties of galaxy clusters.

机译：X射线和星云团的Sunyaev-Zel'dovich效应特性对团簇结构和宇宙学的约束。

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摘要

We present a study of 36 massive galaxy clusters at redshifts 0.14 ≤ z ≤ 0.89, whose properties are used to constrain cluster structure and cosmological models. The clusters are studied at both X-ray wavelengths using data from the Chandra X-ray Observatory, and at centimeter wavelengths using Sunyaev-Zel`dovich Effect (SZE) data from the BIMA and OVRO interferometric arrays. Likelihood analysis is performed using a Markov chain Monte Carlo (MCMC) method, and we motivate and adopt an isothermal beta-model with central 100 kpc excluded from the X-ray data to describe the intracluster medium in all 36 clusters. This model is shown to provide consistently good fits to clusters with a wide range of morphological properties. Best-fit cluster gas masses, total masses, and integrated SZE fluxes are determined from this model within the MCMC framework. X-ray and SZE results are then used in an effort to constrain cluster structure and cosmology. First, the integrated SZE flux is compared with X-ray derived gas mass, spectroscopic temperature, and total mass to determine how firmly connections between observables and derived cluster properties can be established in SZE surveys. These properties are found to display tight scaling relations over the full range of redshift. Cluster gas mass fractions from both X-ray and SZE data are then compared, and the implications for cluster structure are noted. The gas mass fractions are used to obtain constraints on OM and O Λ both by comparing the mean fgas values to OB/OM for assumed OB, and by assuming that fgas should be constant with redshift and determining what cosmology best facilitates this. Cosmological constraints are found to be consistent with CMB results, but a better understanding of the cluster baryon budget is needed to achieve the same level of precision.
机译：我们目前对红移0.14≤z≤0.89的36个大星系星团进行研究，其性质用于约束星团结构和宇宙学模型。使用钱德拉X射线天文台的数据在X射线波长下以及使用BIMA和OVRO干涉阵列的Sunyaev-Zel`dovich效应（SZE）数据在厘米波长下对簇进行了研究。可能性分析是使用Markov链蒙特卡罗（MCMC）方法进行的，我们激发并采用了等温β模型，其中心X射线数据不包含100 kpc，以描述所有36个簇中的簇内介质。结果表明，该模型可以为具有广泛形态学特征的簇提供一致的良好拟合。在MCMC框架内，根据此模型确定最佳拟合的集气质量，总质量和SZE积分通量。然后使用X射线和SZE结果来限制星团结构和宇宙学。首先，将积分的SZE通量与X射线衍生的气体质量，光谱温度和总质量进行比较，以确定在SZE勘测中可以建立多大的可观测量与衍生的团簇性质之间的联系。发现这些属性在整个红移范围内显示紧密的缩放关系。然后比较来自X射线和SZE数据的团簇气体质量分数，并指出对团簇结构的影响。通过将平均fgas值与假定的OB的OB / OM进行比较，并假设fgas在红移下应保持恒定并确定哪种宇宙学最有助于此，气体质量分数可用于获得对OM和OΛ的约束。发现宇宙学约束与CMB结果一致，但是需要获得对簇重子预算的更好理解才能达到相同的精度水平。

著录项

  • 作者

    Laroque, Samuel J.;

  • 作者单位

    The University of Chicago.;

  • 授予单位 The University of Chicago.;
  • 学科 Physics Astronomy and Astrophysics.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 218 p.
  • 总页数 218
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 天文学;
  • 关键词

  • 入库时间 2022-08-17 11:42:46

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