Strong Turbulence in the Cool Cores of Galaxy Clusters: Can Tsunamis Solve the Cooling Flow Problem?
Strong Turbulence in the Cool Cores of Galaxy Clusters: Can Tsunamis Solve the Cooling Flow Problem?
复制标题
DOI：
10.1086/424483
复制
发表时间：
2004-07
期刊：
影响因子：
--
通讯作者：
Y. Fujita;Tomoaki Matsumoto;K. Wada
中科院分区：
文献类型：
--
作者：
Y. Fujita;Tomoaki Matsumoto;K. Wada
高分辨率的二维流体动力学模拟的基础上，我们表明，在星系团，这是自然预期的宇宙的层次结构形成的过程中，大量的气体运动的核心有严重的影响。我们发现，大量的气体运动所代表的声重力波创建本地，但强烈的湍流，再现了复杂的X射线结构最近观察到的集群核心。此外，如果波幅足够大，它们可以抑制核心的辐射冷却。与以往的研究相反，加热是由湍流，而不是弱冲击。湍流可以在不久的将来的太空X射线任务中检测到，例如Astro-E2。
On the basis of high-resolution two-dimensional hydrodynamic simulations, we show that the bulk gas motions in a cluster of galaxies, which are naturally expected during the process of the hierarchical structure formation of the universe, have a serious impact on the core. We found that the bulk gas motions represented by acoustic-gravity waves create local but strong turbulence, which reproduces the complicated X-ray structures recently observed in cluster cores. Moreover, if the wave amplitude is large enough, they can suppress the radiative cooling of the cores. Contrary to the previous studies, the heating is operated by the turbulence, not weak shocks. The turbulence could be detected in near-future space X-ray missions such as Astro-E2.