标题： 附近X射线星系团的代表性样本的温度分布 显示英文标题

标题： Temperature profiles of a representative sample of nearby X-ray galaxy clusters

摘要： 对星系团中高温的、X射线辐射的团内介质温度分布的结构和尺度性质及其与动力状态的依赖关系的研究，可以为控制结构形成和演化的物理过程提供见解。我们分析了来自统计代表性样本的15个附近（z < 0.2）星系团的XMM-Newton观测所得的X射线温度剖面。这些星系团的温度范围从2.5 keV到8.5 keV，并呈现出多种X射线形态。我们得出准确的投影温度剖面至约0.5 R_200，并将结构特性（外斜率、冷却核心的存在）与由功率比表示的X射线形态的定量测量进行比较。我们还将结果与最近的宇宙学数值模拟进行了比较。一旦温度剖面通过平均簇温度（排除中心区域）和估计的virial半径进行缩放，在0.1 R_200 < R < 0.5 R_200区域，剖面通常会下降。中心区域显示出最大的散射，这主要是由于存在冷却核心簇。在核心区域之外，与数值模拟有良好的一致性。我们发现功率比与外剖面斜率之间没有明显的相关性。然而，可能存在一个弱趋势，即存在冷却核心的存在，即具有中心温度减少的簇似乎稍微更规则。目前的结果进一步表明，至少在核心区域之外，簇是一个规则的群体。 显示英文摘要

摘要： A study of the structural and scaling properties of the temperature distribution of the hot, X-ray emitting intra-cluster medium of galaxy clusters, and its dependence on dynamical state, can give insights into the physical processes governing the formation and evolution of structure. We analyse the X-ray temperature profiles from XMM-Newton observations of 15 nearby (z < 0.2) clusters, drawn from a statistically representative sample. The clusters cover a temperature range from 2.5 keV to 8.5 keV, and present a variety of X-ray morphologies. We derive accurate projected temperature profiles to ~ 0.5 R_200, and compare structural properties (outer slope, presence of cooling core) with a quantitative measure of the X-ray morphology as expressed by power ratios. We also compare the results to recent cosmological numerical simulations. Once the temperature profiles are scaled by an average cluster temperature (excluding the central region) and the estimated virial radius, the profiles generally decline in the region 0.1 R_200 < R < 0.5 R_200. The central regions show the largest scatter, attributable mostly to the presence of cool core clusters. There is good agreement with numerical simulations outside the core regions. We find no obvious correlations between power ratio and outer profile slope. There may however be a weak trend with the existence of a cool core, in the sense that clusters with a central temperature decrement appear to be slightly more regular. The present results lend further evidence to indicate that clusters are a regular population, at least outside the core region.