论文标题
NGC7538 HII地区的反馈
FEEDBACK from the NGC7538 HII region
论文作者
论文摘要
上下文：扩展HII区域如何与其环境云相互作用？这是推动索非亚传统计划反馈的中心问题之一。在这里，我们提出了针对原型H {\ sc ii}区域NGC7538的案例研究。方法：使用索非亚，我们在1.9thz的[CII]线中绘制了〜210'^2的面积。互补观察到的原子碳[CI]和High-J CO（8-7）数据以及档案NIR/FIR，CM Continuum，CO（3-2），HI数据折叠为分析。 Results: While the overall [CII] morphology follows the general ionized gas, the channel maps show multiple bubble-like structures with sizes on the order of ~80-100" (~1.0-1.28pc). While at least one of them may be an individual feedback bubble driven by the main exciting sources of the region, the other bubble-morphologies may also be due to the intrinsically porous structure of the HII region. An analysis of the expansion S^{ - 1}左右的速度表明，从中央O型驱动器中的风驱动不足，但最蓝色的[CII]组件几乎没有分子或原子量的对应物。 PDR中的碳中的分层结构以其离子形式为主导，其原子和分子质量分别为〜0.45+-0.1m _ {\ odot}和〜1.2+-0.1m _ {\ odot} NGC7538 HII区域表现出一组相互相互作用的子结构以及与其他[CII]的[CII]观察结果（例如Orion Veil，Rcw120，rcw49），泡沫形态在[CII]中揭示了selts selts sells，
Context: How do expanding HII regions interact with their environmental cloud? This is one of the central questions driving the SOFIA legacy program FEEDBACK. Here, we present a case study toward the prototypical H{\sc ii} region NGC7538. Methods: With SOFIA we mapped an area of ~210'^2 around NGC7538 in the [CII] line at 1.9THz. Complementary observed atomic carbon [CI] and high-J CO(8-7) data as well as archival NIR/FIR, cm continuum, CO(3-2) and HI data are folded into the analysis. Results: While the overall [CII] morphology follows the general ionized gas, the channel maps show multiple bubble-like structures with sizes on the order of ~80-100" (~1.0-1.28pc). While at least one of them may be an individual feedback bubble driven by the main exciting sources of the region, the other bubble-morphologies may also be due to the intrinsically porous structure of the HII region. An analysis of the expansion velocities around 10km s^{-1} indicates that thermal expansion is not sufficient but that wind-driving from the central O-stars is required. The most blue-shifted [CII] component has barely any molecular or atomic counterparts. At the interface to the molecular cloud, we find a typical photon-dominated region (PDR) with a bar-shape. Ionized, atomic and molecular carbon show a layered structure in this PDR. The carbon in the PDR is dominated by its ionized form with atomic and molecular masses of ~0.45+-0.1M_{\odot} and ~1.2+-0.1M_{\odot}, respectively, compared to the ionized carbon in the range of 3.6-9.7M_{\odot}. Conclusions: The NGC7538 HII region exhibits a diverse set of sub-structures that interact with each other as well as with the adjacent cloud. Compared to other recent [CII] observations of HII regions (e.g., Orion Veil, RCW120, RCW49), bubble-shape morphologies revealed in [CII] emission, indicative of expanding shells, are recurring structures of PDRs.
