论文标题
$ l = 41^\ circ $，$ b = -1^\ circ $的冷且漫射的巨型分子细丝
A Cold and Diffuse Giant Molecular Filament in the Region of $l=41^\circ$, $b=-1^\circ$
论文作者
论文摘要
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.使用数据，我们发现了$ l \ l \ oft 38 \ sim42^\ circ $，$ b \ of-3.5 \ sim0^\ circ $，$ v_ {lsr} \ of y sim42^\ circ $左右，发现了一个巨大的分子细丝（GMF）。在1.7 kpc的距离时，GMF长约160 pc。中位激发温度约为7.5 K，中位柱密度约为$ 10^{21} $ cm $^{ - 2} $，与已知的GMF相比，该GMF非常冷且非常分散。使用数据立方体中的形态，GMF分为四个组成部分，其中三个显示了丝状结构。组件的质量为$ 10^3 \ sim 10^4 m_ \ odot $，整个细丝的总质量约为$ 7 \ times10^4 m_ \ odot $，来自LTE方法。搜索每个组件中的$^{13} $ CO内核。这些核心的病毒参数约为2.5，对质量的幂律指数为-0.34。 $^{13} $ CO追踪到$^{12} $ co追踪的弥散云的密集核心的质量分数约为GMF的所有组件。我们发现在GMF中可能会出现大规模的大规模丝丝碰撞。
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.
