标题： Suzaku对阿贝尔1689的观测：与大尺度结构相关的各向异性温度和熵分布 显示英文标题

标题： Suzaku Observation of Abell 1689: Anisotropic Temperature and Entropy Distributions Associated with the Large-Scale Structure

摘要： （摘要）我们展示了对阿贝尔1689星系团内介质（ICM）的Suzaku观测结果，结合了SDSS数据的补充分析以及Subaru/Suprime-Cam和HST/ACS观测的弱引力透镜和强引力透镜分析。 在4.0 sigma显著性水平下检测到了围绕virial半径的ICM的微弱X射线辐射。 我们发现星系团外围的气体温度和熵分布具有各向异性，与大尺度结构相关。 东北部（NE）外围的高温和高熵区域与一个高密度的丝状结构相连。 与低密度空洞环境接触的外围区域具有较低的气体温度和熵，偏离了流体静力平衡。 这些结果表明，ICM的热化过程沿丝状结构比在空洞区域发生得更快。 联合X射线和引力透镜分析显示，流体静力质量是球形引力透镜质量的$\sim60-90%$，但在$0.6r_{2500} \simlt r \simlt 0.8r_{500}$范围内与三轴晕质量相当，在误差范围内，且无论质量模型如何，在$0.4r_{2500}$内其偏差显著低至$\simlt60%$。 在$r_{500}$内的热气体压力最多为总压力的$\sim50$--60%，以完全平衡球形引力透镜质量的重力，而在virial半径附近为$\sim30$--40%。 尽管考虑到可能的晕三轴性，这些下限表明需要额外的压力源，如整体和/或湍流运动。 显示英文摘要

摘要： (Abridged) We present results of Suzaku observations of the intracluster medium (ICM) in Abell 1689, combined with complementary analysis of the SDSS data and weak and strong lensing analysis of Subaru/Suprime-Cam and HST/ACS observations. Faint X-ray emission from the ICM around the virial radius is detected at 4.0 sigma significance. We find anisotropic gas temperature and entropy distributions in cluster outskirts correlated with large-scale structure of galaxies. The high temperature and entropy region in the northeastern (NE) outskirts is connected to an overdense filamentary structure. The outskirt regions in contact with low density void environments have low gas temperatures and entropies, deviating from hydrostatic equilibrium. These results suggest that thermalization of the ICM occurs faster along the filamentary structures than the void regions. A joint X-ray and lensing analysis shows that the hydrostatic mass is $\sim60-90%$ of spherical lensing one but comparable to a triaxial halo mass within errors in $0.6r_{2500} \simlt r \simlt 0.8r_{500}$, and that it is significantly biased as low as $\simlt60%$ within $0.4r_{2500}$, irrespective of mass models. The thermal gas pressure within $r_{500}$ is, at most, $\sim50$--60% of the total pressure to balance fully the gravity of the spherical lensing mass, and $\sim30$--40% around the virial radius. Although these constitute lower limits when one considers the possible halo triaxiality, these small relative contributions of thermal pressure would require additional sources of pressure, such as bulk and/or turbulent motions.