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.

中文翻译：

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包括宇宙射线影响的气态盘的 Parker-Jeans 不稳定性动力学

通过三维磁流体动力学 (MHD) 模拟研究宇宙射线对磁化自引力气态盘中 Parker-Jeans 不稳定性的影响，宇宙射线被视为具有显着压力的无质量流体。在模拟中考虑了沿磁场的宇宙射线扩散。圆盘的初始配置是夹在热电晕（顶部和底部）之间的磁化冷气体板。我们表明宇宙射线在某些参数范围内的细丝或团块的形成中起着重要作用。在一定的气片厚度范围内，宇宙线扩散系数对确定细丝是沿磁场方向还是垂直于磁场方向起着决定性作用。我们还考虑了旋转对系统的影响。