非对准磁场引起的吸积流中的磁螺线
Magnetic Spirals in Accretion Flows Originated from Misaligned Magnetic Field
摘要：
自转与磁场的不重合被认为是云核坍缩过程中磁制动效应减弱的物理机制之一。然而，其基本要素知之甚少。因此，我们对所涉及的物理学进行了更详细的分析。我们分析现有的模拟数据来测量系统的扭矩，质量吸积率和Toomre Q参数。我们还研究了系统中存在的冲击。虽然平流扭矩一般是最强的，我们发现，磁和重力扭矩可以发挥重要作用，在如何在磁盘形成过程中的角动量转移。磁转矩可以塑造吸积流，产生与磁场对齐的双臂磁化流入螺旋。我们发现证据的吸积冲击，是根据系统的螺旋结构对齐。在这项工作中探索的双极扩散的列入已显示出轻微的影响，在小规模的结构，但不是在主要形态。我们讨论潜在的候选系统，其中一些现象可能存在。
英文摘要：
Misalignment between rotation and magnetic field has been suggested to be one type of physical mechanisms which can easen the effects of magnetic braking during collapse of cloud cores leading to formation of protostellar disks. However, its essential factors are poorly understood. Therefore, we perform a more detailed analysis of the physics involved. We analyze existing simulation data to measure the system torques, mass accretion rates and Toomre Q parameters. We also examine the presence of shocks in the system. While advective torques are generally the strongest, we find that magnetic and gravitational torques can play substantial roles in how angular momentum is transferred during the disk formation process. Magnetic torques can shape the accretion flows, creating two-armed magnetized inflow spirals aligned with the magnetic field. We find evidence of an accretion shock that is aligned according to the spiral structure of the system. Inclusion of ambipolar diffusion as explored in this work has shown a slight influence in the small scale structures but not in the main morphology. We discuss potential candidate systems where some of these phenomena could be present.
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