MHD turbulence对热星系团热导率的调节
Regulation of thermal conductivity in hot galaxy clusters by MHD turbulence
摘要：
重新研究了热传导在调节星系团冷却流热行为中的作用。最近的研究表明，在稀等离子体中，由磁场引起的各向异性库仑热通量驱动动力学不稳定性。冷却流理论的一个长期存在的问题是理解热传导如何抵消辐射芯损耗而不完全防止它们。在这封信中，我们提出，磁流体动力学湍流驱动的热通量不稳定性调节场线绝缘和驱动器的反向对流热通量，这两者都可以调解的热集群的冷却核心的稳定。该模型表明，湍流混合应伴随着冷却流中的强热梯度。这一预测似乎得到了支持的金属在星系团的中央星系的空间分布，这表明了一个更强的相关性比与母恒星星族的环境热气体温度梯度。
英文摘要：
The role of thermal conduction in regulating the thermal behavior of cooling flows in galaxy clusters is reexamined. Recent investigations have shown that the anisotropic Coulomb heat flux caused by a magnetic field in a dilute plasma drives a dynamical instability. A long standing problem of cooling flow theory has been to understand how thermal conduction can offset radiative core losses without completely preventing them. In this Letter we propose that magnetohydrodynamic turbulence driven by the heat flux instability regulates field-line insulation and drives a reverse convective thermal flux, both of which may mediate the stabilization of the cooling cores of hot clusters. This model suggests that turbulent mixing should accompany strong thermal gradients in cooling flows. This prediction seems to be supported by the spatial distribution of metals in the central galaxies of clusters, which shows a much stronger correlation with the ambient hot gas temperature gradient than with the parent stellar population.
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