论文标题
旋转轴和磁场之间的未对准对星际磁盘的影响
The Effect of Misalignment between Rotation Axis and Magnetic Field on Circumstellar Disk
论文作者
论文摘要
使用三维电阻磁水动力学模拟研究了脉络膜磁盘的形成，其中最初的prestellar云相对于磁场具有未对准的旋转轴。我们检查了（i）全局磁场和云旋转轴（$θ_0$）和（ii）热力与重力与重力能量（$α_0$）之间的初始角差（$θ_0$）的影响。我们总共研究了$ 16 $的型号，并计算云的演变，直到$ \ sim \！原子形成后5000美元。我们的仿真结果表明，初始非零$θ_0$（$> 0 $）促进了磁盘编队，但倾向于抑制流出驾驶，对于中等重力不稳定的型号，$α_0\ lyssim 1 $。在这些模型中，出现了大型旋转磁盘形式和弱流出的情况，与对齐情况下的较小磁盘和强大的流出相比（$θ_0= 0 $）。此外，我们发现，当初始云高于小$α_0$的高度不稳定时，初始角度差$θ_0$不会显着影响磁盘形成和流出驱动。
The formation of circumstellar disks is investigated using three-dimensional resistive magnetohydrodynamic simulations, in which the initial prestellar cloud has a misaligned rotation axis with respect to the magnetic field. We examine the effects of (i) the initial angle difference between the global magnetic field and the cloud rotation axis ($θ_0$) and (ii) the ratio of the thermal to gravitational energy ($α_0$). We study $16$ models in total and calculate the cloud evolution until $\sim \! 5000$ yr after protostar formation. Our simulation results indicate that an initial non-zero $θ_0$ ($> 0$) promotes the disk formation but tends to suppress the outflow driving, for models that are moderately gravitationally unstable, $α_0 \lesssim 1$. In these models, a large-sized rotationally-supported disk forms and a weak outflow appears, in contrast to a smaller disk and strong outflow in the aligned case ($θ_0 = 0$). Furthermore, we find that when the initial cloud is highly unstable with small $α_0$, the initial angle difference $θ_0$ does not significantly affect the disk formation and outflow driving.
