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arXiv 0902.0003astro-ph.CO
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镓团簇的性质与亮度和红移的关系

Characterizing the Properties of Clusters of Galaxies as a Function of Luminosity and Redshift

K. Andersson, J. R. Peterson, G. Madejski, A. Goobar

摘要:

我们报告的应用程序的一个新的蒙特卡罗方法,平滑粒子推断(SPI,在一对配套文件中描述),对XMM-牛顿卫星的星系团的X射线观测的分析和解释。我们的样本由公开的,曝光良好的观测到的红移z > 0.069的星系团组成,共有101个天体。我们测定了X射线发射气体的光度和温度结构,目的是定量地研究散射和LX-T关系的演化,以及红移对团簇亚结构的依赖性。我们证实了L_X \propto T ^3,并发现了一个弱的红移依赖关系(\propto(1+z)^(β_LT),β_LT=0.50 ± 0.34),与Chandra的一些结果相反.动力学活动水平的建立使用“功率比”的方法,我们发现的P_3/P_0功率比的演变迹象。提出了一种新的温度两点关联函数法。该方法用于确定作为空间尺度的函数的X射线发射气体中的温度波动的“功率谱”。我们展示了这种方法如何可以卓有成效地用于识别冷却核心集群,以及那些与干扰结构,大概是由于正在进行或最近的合并活动。

英文摘要:

We report the application of a new Monte Carlo method, Smoothed Particle Inference (SPI, described in a pair of companion papers), towards analysis and interpretation of X-ray observations of clusters of galaxies with the XMM-Newton satellite. Our sample consists of publicly available, well-exposed observations of clusters at redshifts z > 0.069, totaling 101 objects. We determine the luminosity and temperature structure of the X-ray emitting gas, with the goal to quantify the scatter and the evolution of the L_X - T relation, as well as to investigate the dependence on cluster substructure with redshift. We confirm that L_X \propto T^3 and we find a weak redshift dependence (\propto (1+z)^(β_LT), β_LT=0.50 +- 0.34), in contrast to some Chandra results. The level of dynamical activity is established using the "power ratios" method, and we find signs of evolution in the P_3/P_0 power ratio. A new method, the "temperature two-point correlation function," is proposed. This method is used to determine the "power spectrum" of temperature fluctuations in the X-ray emitting gas as a function of spatial scale. We show how this method can be fruitfully used to identify cooling core clusters as well as those with disturbed structures, presumably due to on-going or recent merger activity.

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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