论文标题
映射北天杆循环中弥漫性H I的热凝结
Mapping the Thermal Condensation of Diffuse H I in the North Celestial Pole Loop
论文作者
论文摘要
北天极环（NCPL）提供了一个独特的实验室，用于研究恒星形成的早期阶段，尤其是中性星际培养基（ISM）的凝结。了解控制其内容的演变的物理特性是发现NCPL的起源的关键。 Ghigls 21 cm线调查（9'4）的NCPL区域的档案数据用于将其多相内容映射为$ {\ tt rohsa} $，这是一种高斯分解工具，其中包括空间正则化。提取每个相的柱密度和质量分数及其不确定性。 Dhigls 21 cm（1'）调查的档案数据用于进一步探测NCPL的多相含量。我们已经在NCPL中的空间（和动态）相干组件确定了四个相干组件，其中之一是一个明显定义的拱门，以$ 14 \ {\ rm km s^{ - 1}} $远离我们，这可能是大规模组织的动态过程，该过程是相位过渡的起源。沿环路沿着中性气体的质量含量统治着寒冷和冷淡的相位。使用吸收测量值，我们发现冷相表现出略有超音速湍流。
The North Celestial Pole Loop (NCPL) provides a unique laboratory for studying the early stages of star formation, in particular the condensation of the neutral interstellar medium (ISM). Understanding the physical properties that control the evolution of its contents is key to uncovering the origin of the NCPL. Archival data from the NCPL region of the GHIGLS 21 cm line survey (9'4) are used to map its multiphase content with ${\tt ROHSA}$, a Gaussian decomposition tool that includes spatial regularization. Column density and mass fraction maps of each phase were extracted along with their uncertainties. Archival data from the DHIGLS 21 cm (1') survey are used to further probe the multiphase content of the NCPL. We have identified four spatially (and dynamically) coherent components in the NCPL, one of which is a remarkably well-defined arch moving at about $14\ {\rm km s^{-1}}$ away from us that could be a relic of the large-scale organized dynamical process at the origin of the phase transition. The cold and lukewarm phases together dominate the mass content of the neutral gas along the loop. Using absorption measurements, we find that the cold phase exhibits slightly supersonic turbulence.
