量化分子云中重力和磁场之间的相互作用--NGC6334中可能的多尺度能量均分
Quantifying the interplay between gravity and magnetic field in molecular clouds - a possible multi-scale energy equipartition in NGC6334
摘要：
引力、湍流和磁场之间的相互作用决定了分子ISM的演化和恒星的形成。尽管越来越多的兴趣，仍然缺乏理解的重要性，磁场在多个尺度。我们推导出磁能谱--一种约束磁能多尺度分布的度量，并将其与Li \& Burkert（2016）中推导的引力能谱进行比较。在我们的形式中，引力能谱完全由表面密度PDF决定，而磁能谱则由表面密度PDF和磁场密度关系决定。如果区域的密度PDF接近于$P(Σ)\sim Σ^{-2}$，并且具有普遍的磁场-密度关系$B\sim ρ^{1/2}$，则我们预期重力和磁场之间存在多尺度的近均分。在NGC 6334中发现这种均分是正确的，其中可以获得多个尺度（从0.1秒差距到几个秒差距）的磁场估计。然而，目前的观察仍然是有限的样本量。在未来，有必要获得不同的云与不同的表面密度PDF的磁场的多尺度测量，并应用我们的形式主义，以进一步研究重力-磁场相互作用。
英文摘要：
The interplay between gravity, turbulence and the magnetic field determines the evolution of the molecular ISM and the formation of the stars. In spite of growing interests, there remains a lack of understanding of the importance of magnetic field over multiple scales. We derive the magnetic energy spectrum -- a measure that constraints the multi-scale distribution of the magnetic energy, and compare it with the gravitational energy spectrum derived in Li \& Burkert (2016). In our formalism, the gravitational energy spectrum is purely determined by the surface density PDF, and the magnetic energy spectrum is determined by both the surface density PDF and the magnetic-field-density relation. If regions have density PDFs close to $P(Σ)\sim Σ^{-2}$ and a universal magnetic field-density relation $B\sim ρ^{1/2}$, we expect a multi-scale near equipartition between gravity and the magnetic fields. This equipartition is found to be true in NGC6334 where estimates of magnetic fields over multiple scales (from 0.1 pc to a few parsec) are available. However, the current observations are still limited in sample size. In the future, it is necessary to obtain multi-scale measurements of magnetic fields from different clouds with different surface density PDFs and apply our formalism to further study the gravity-magnetic field interplay.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
