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A cold and diffuse giant molecular filament in the region of l = 41°, b = −1°
Research in Astronomy and Astrophysics ( IF 1.8 ) Pub Date : 2020-09-01 , DOI: 10.1088/1674-4527/20/9/143
Liang-Hao Lin 1 , Hong-Chi Wang 1, 2 , Yang Su 1 , Chong Li 1, 3 , Ji Yang 1
Affiliation  

Data of $^{12}$CO/$^{13}$CO/C$^{18}$O $J=1\to0$ emission toward the Galactic plane region of $l=35^\circ$ to $45^\circ$ and $b= -5^\circ$ to $+5^\circ$ are available with the Milky Way Imaging Scroll Painting (MWISP) project. Using the data, we found a giant molecular filament (GMF) around $l\approx38\sim42^\circ$, $b\approx-3.5\sim0^\circ$, $V_{LSR} \approx 27 \sim 40$ km~s$^{-1}$, named the GMF MWISP G041-01. At a distance of 1.7 kpc, the GMF is about 160 pc long. With a median excitation temperature about 7.5 K and a median column density about $10^{21}$ cm$^{-2}$, this GMF is very cold and very diffuse compared to known GMFs. Using the morphology in the data cube, the GMF is divided into four components among which three show filamentary structure. Masses of the components are $ 10^3 \sim 10^4 M_\odot$, with a total mass for the whole filament being about $7\times10^4 M_\odot$ from the LTE method. $^{13}$CO cores inside each component are searched. Virial parameters are about 2.5 for these cores and have a power-law index of -0.34 against the mass. The mass fraction of dense cores traced by $^{13}$CO to the diffuse clouds traced by $^{12}$CO are about 7% for all components of the GMF. We found signatures of possible large scale filament-filament collision in the GMF.

中文翻译:

l = 41°,b = -1°区域内的冷扩散巨分子丝

$^{12}$CO/$^{13}$CO/C$^{18}$O $J=1\to0$ 向 $l=35^\circ$ 至 $45 的银河平面区域发射的数据^\circ$ 和 $b= -5^\circ$ 到 $+5^\circ$ 可用于银河成像滚动绘画 (MWISP) 项目。使用数据,我们在 $l\approx38\sim42^\circ$, $b\approx-3.5\sim0^\circ$, $V_{LSR} \approx 27 \sim 40$附近发现了一个巨大的分子丝(GMF) km~s$^{-1}$,命名为 GMF MWISP G041-01。在 1.7 kpc 的距离下,GMF 长约 160 pc。中值激发温度约为 7.5 K,中值柱密度约为 $10^{21}$ cm$^{-2}$,与已知 GMF 相比,这种 GMF 非常冷且非常分散。使用数据立方体中的形态,将 GMF 分为四个部分,其中三个显示丝状结构。组件的质量为 $ 10^3 \sim 10^4 M_\odot$,来自 LTE 方法的整个灯丝的总质量约为 $7\times10^4 M_\odot$。搜索每个组件内的 $^{13}$CO 核心。这些核的维里参数约为 2.5,对质量的幂律指数为 -0.34。对于 GMF 的所有成分,由 $^{13}$CO 追踪到由 $^{12}$CO 追踪的漫射云的致密核心的质量分数约为 7%。我们在 GMF 中发现了可能的大规模细丝-细丝碰撞的特征。
更新日期:2020-09-01
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