磁场对光致电离柱和球的影响
Effects of Magnetic Fields on Photoionised Pillars and Globules
摘要：
利用三维辐射-磁流体动力学模拟研究了初始均匀磁场对H II区边界致密柱和彗星球状体形成和演化的影响。它示出，在与以前的工作，需要一个强大的初始磁场显着改变非磁化的动态，因为从光电离的能量输入是如此之大，它仍然是占主导地位的驱动程序的动态在大多数情况下。此外，它被发现，对于弱和中等场强的初始垂直场被扫到与支柱对齐在其动态演化，匹配磁场观测的“创造之柱”在M16和一些彗星球状体。一个强的垂直磁场保持在其初始配置，也限制了光蒸发流到一个条形的致密电离带，部分屏蔽电离前沿，并将很容易观察到的复合线。一个简单的分析模型来解释这种明亮的线性结构的性质。这些结果表明，恒星形成区域的磁场强度原则上会受到H II区域边缘形成的结构形态的显着约束。
英文摘要：
The effects of initially uniform magnetic fields on the formation and evolution of dense pillars and cometary globules at the boundaries of H II regions are investigated using 3D radiation-magnetohydrodynamics simulations. It is shown, in agreement with previous work, that a strong initial magnetic field is required to significantly alter the non-magnetised dynamics because the energy input from photoionisation is so large that it remains the dominant driver of the dynamics in most situations. Additionally it is found that for weak and medium field strengths an initially perpendicular field is swept into alignment with the pillar during its dynamical evolution, matching magnetic field observations of the `Pillars of Creation' in M16 and also some cometary globules. A strong perpendicular magnetic field remains in its initial configuration and also confines the photoevaporation flow into a bar-shaped dense ionised ribbon which partially shields the ionisation front and would be readily observable in recombination lines. A simple analytic model is presented to explain the properties of this bright linear structure. These results show that magnetic field strengths in star-forming regions can in principle be significantly constrained by the morphology of structures which form at the borders of H II regions.
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