论文标题
卡琳娜西墙的长度尺度和动态
Length-scales and Dynamics of Carina's Western Wall
论文作者
论文摘要
我们使用高分辨率的Alma观测值介绍了Carina星云中光脱离区域（PDR）的湍流动力学的各种分析。使用主成分分析，我们建议该分子云中的湍流在大尺度上驱动。对质心速度结构功能的分析表明，湍流由冲击而不是局部（在K空间）运输的能量运输支配。我们进一步发现，在0.02-0.03 PC范围内的长度尺度在该云的动力学中很重要，并且通过对主要发射结构长度尺度的分析来支持这一发现。这些长度尺度通过观察数据很好地解决了，我们得出结论，这种尺度范围的明显重要性是物理起源。鉴于它在受双极扩散强烈影响的范围内也很好，我们得出结论，它不是仅仅是湍流的产物，而是更可能是由于重力和湍流之间相互作用的结果。最后，通过将这些结果与先前从西壁的H2发射的观察结果进行比较，我们证明了对PDR的观察结果可用于探测分子云未受干扰部分的内部结构。
We present a variety of analyses of the turbulent dynamics of the boundary of a photo-dissociation region (PDR) in the Carina Nebula using high resolution ALMA observations. Using Principal Component Analysis we suggest that the turbulence in this molecular cloud is driven at large scales. Analysis of the centroid velocity structure functions indicate that the turbulence is dominated by shocks rather than local (in k-space) transport of energy. We further find that length-scales in the range 0.02 - 0.03 pc are important in the dynamics of this cloud and this finding is supported by analysis of the dominant emission structure length-scale. These length-scales are well resolved by the observational data and we conclude that the apparent importance of this range of scales is physical in origin. Given that it is also well within the range strongly influenced by ambipolar diffusion, we conclude that it is not primarily a product of turbulence alone, but is more likely to be a result of the interplay between gravity and turbulence. Finally, through comparison of these results with previous observations of H2 emission from the Western Wall we demonstrate that observations of a PDR can be used to probe the internal structure of the undisturbed portion of a molecular cloud.
