X射线冷锋示踪的星系团核的动力学和磁化
Dynamics and Magnetization in Galaxy Cluster Cores Traced by X-ray Cold Fronts
摘要：
冷锋（CF）-密度和温度等离子体不连续性-在星系团的冷核中无处不在，在那里它们出现在团内介质中的X射线亮度边缘，几乎与星系团中心同心。我们分析了在文献中发现的核心CF的热力学配置文件defrojected。虽然压力似乎连续通过这些CF，我们发现，所有这些都需要显着的向心加速度下的前线。这是自然地解释了切向，近音速的整体流动正下方的CF，和切向剪切流涉及公平的一部分等离子体下方的前面。这样的剪切应该会产生接近均分的磁场，其范围在距离正面小于50 pc的范围内，并且可以磁化整个核心。这样的磁场可以解释冷核CF的表面稳定性和最近报道的CF-射电微晕关联。
英文摘要：
Cold fronts (CFs) - density and temperature plasma discontinuities - are ubiquitous in cool cores of galaxy clusters, where they appear as X-ray brightness edges in the intracluster medium, nearly concentric with the cluster center. We analyze the thermodynamic profiles deprojected across core CFs found in the literature. While the pressure appears continuous across these CFs, we find that all of them require significant centripetal acceleration beneath the front. This is naturally explained by a tangential, nearly sonic bulk flow just below the CF, and a tangential shear flow involving a fair fraction of the plasma beneath the front. Such shear should generate near-equipartition magnetic fields on scales ~<50 pc from the front, and could magnetize the entire core. Such fields would explain the apparent stability of cool-core CFs and the recently reported CF-radio minihalo association.
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