X射线星系团的总质量偏差
Total mass biases in X-ray galaxy clusters
摘要：
利用星系团作为宇宙学探测器依赖于对它们总引力质量的精确测量。X射线观测提供了探测星系团总质量分布的有力手段，但可能会受到观测偏差的影响，并依赖于源于我们对星系团内介质物理学有限理解的简单假设。本文旨在阐明星系团中X射线总质量估算的可靠性，通过适当地解开观测和物理来源的各种偏差。我们使用N-body/SPH模拟的大样本~100星系团和调查总质量偏差通过比较的质量重建采用类似的观测方法与真实的质量在模拟。采用不同的模型和不同的径向拟合范围对模拟得到的X射线表面亮度和温度分布进行拟合，以考察模型和外推偏差。不同的气体温度的理论定义被用来调查光谱温度的影响和功率比分析的表面亮度地图，使我们能够评估集群动力学状态的质量偏差的依赖。此外，我们进行了研究的可靠性的流体静力学和流体动力学平衡质量估计使用的全三维信息的模拟。[删节]
英文摘要：
The exploitation of clusters of galaxies as cosmological probes relies on accurate measurements of their total gravitating mass. X-ray observations provide a powerful means of probing the total mass distribution in galaxy clusters, but might be affected by observational biases and rely on simplistic assumptions originating from our limited understanding of the intracluster medium physics. This paper is aimed at elucidating the reliability of X-ray total mass estimates in clusters of galaxies by properly disentangling various biases of both observational and physical origin. We use N-body/SPH simulation of a large sample of ~100 galaxy clusters and investigate total mass biases by comparing the mass reconstructed adopting an observational-like approach with the true mass in the simulations. X-ray surface brightness and temperature profiles extracted from the simulations are fitted with different models and adopting different radial fitting ranges in order to investigate modeling and extrapolation biases. Different theoretical definitions of gas temperature are used to investigate the effect of spectroscopic temperatures and a power ratio analysis of the surface brightness maps allows us to assess the dependence of the mass bias on cluster dynamical state. Moreover, we perform a study on the reliability of hydrostatic and hydrodynamical equilibrium mass estimates using the full three-dimensional information in the simulation.[abridged]
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