论文标题
大规模恒星形成位点的电离细丝和持续的物理过程左右= 345.5度
Ionized filaments and ongoing physical processes in massive star-forming sites around l = 345.5 degree
论文作者
论文摘要
关于恒星形成部位的尘埃和分子丝进行了许多研究，但只有有限的研究集中在电离丝上。为了研究这一方面，我们对$ \ sim $ 74.6 Arcmin $ \ times $ 55 Arcmin面积的多波长数据进行了分析。使用843 MHz Continuum图，确定了由大型OB星星供电的离子化团块的两个不同的电离细丝（即IF-A（范围$ \ sim $ 8.5 arcmin）和IF（范围$ \ sim $ 22.65 arcmin））。使用$^{13} $ CO（2-1）和C $^{18} $ O（2-1）行数据，在[$ - $ 21，$ 10，$ 10] km S $^{ - 1} $的速度范围内研究IF-A和IF-B的母体分子云，并具有Filmentary Emplactance。至少有两个云组件约为$ - $ 18和$ - $ 15 km s $^{ - 1} $，用于研究IF-A和IF-B的父云，并在速度空间中连接。这些丝状云在主要轴线上还在空间上相互重叠，从而支持丝状扭曲/耦合性质。明显的I类质体和巨大的恒星似乎被观察到云成分的共同区域。这些发现支持了1.2 Myr左右的两个丝状云的碰撞。电离丝的存在似乎是由巨大恒星的组合反馈来解释的。与IF-A和IF相关的分子细丝偏爱最新模型的结果，这些模型与细丝中形成的O恒星的逃逸和电离辐射的陷阱有关。
Numerous research studies on dust and molecular filaments have been conducted in star-forming sites, but only a limited number of studies have focused on ionized filaments. To observationally study this aspect, we present an analysis of multi-wavelength data of an area of $\sim$74.6 arcmin $\times$ 55 arcmin around l = 345.5 degree. Using the 843 MHz continuum map, two distinct ionized filaments (i.e., IF-A (extent $\sim$8.5 arcmin) and IF-B (extent $\sim$22.65 arcmin)) hosting ionized clumps powered by massive OB stars are identified. Using the $^{13}$CO(2-1) and C$^{18}$O(2-1) line data, the parent molecular clouds of IF-A and IF-B are studied in a velocity range of [$-$21, $-$10] km s$^{-1}$, and have filamentary appearances. At least two cloud components around $-$18 and $-$15 km s$^{-1}$ toward the parent clouds of IF-A and IF-B are investigated, and are connected in velocity space. These filamentary clouds also spatially overlap with each other along the major axis, backing the filamentary twisting/coupling nature. Noticeable Class I protostars and massive stars appear to be observed toward the common zones of the cloud components. These findings support the collision of two filamentary clouds around 1.2 Myr ago. The existence of the ionized filaments seems to be explained by the combined feedback of massive stars. The molecular filaments associated with IF-A and IF-B favour the outcomes of the most recent model concerning the escape and the trap of the ionizing radiation from an O star formed in a filament.
