包括宇宙射线影响的气体盘的Parker-Jeans不稳定性动力学
Dynamics of the Parker-Jeans instability of gaseous disks including the effect of cosmic rays
摘要：
将宇宙射线视为具有显著压力的无质量流体，采用三维磁流体动力学（MHD）方法研究了宇宙射线对磁化自引力气体圆盘中Parker-Jeans不稳定性的影响.模拟中考虑了宇宙线沿磁场的扩散。盘的初始配置是夹在热电晕（顶部和底部）之间的磁化冷气板。我们表明，宇宙射线在某些参数制度的细丝或团块的形成中起着重要的作用。在一定的气片厚度范围内，宇宙线的扩散系数对灯丝是沿磁场方向还是垂直于磁场方向起决定性作用。我们还考虑了旋转对系统的影响。
英文摘要：
The effect of cosmic rays on the Parker-Jeans instability in magnetized self-gravitating gaseous disks is studied by three-dimensional magnetohydrodynamic (MHD) simulations with cosmic rays taken as a massless fluid with notable pressure. Cosmic ray diffusion along the magnetic field is taken into account in the simulation. The initial configuration of the disk is a magnetized cold gas slab sandwiched between hot corona (on top and bottom). We show that cosmic rays play an important role in the formation of filaments or clumps in some parameter regimes. In a certain range of the thickness of the gas slab, the cosmic ray diffusion coefficient plays a decisive role in determining whether the filaments lie along or perpendicular to the magnetic field. We also consider the effect of rotation on the system.
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