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arXiv 2207.06602astro-ph.GA
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朝向大质量恒星形成区G176 .51+00.20的中性恒星风

Neutral Stellar Winds Toward the High-Mass Star-Forming Region G176.51+00.20

Li Yingjie, Xu Ye, Xu Jin-Long, Liu Dejian, Li Jingjing, Lin Zehao, Jiang Peng, Bian Shuaibo, Hao Chaojie, Chen Xiuhui

摘要:

利用500米口径球面射电望远镜(FAST)的19波束跟踪观测模式对G176.51+00.20大质量恒星形成区进行了观测。这是一项寻找氢原子追踪的中性恒星风的试点工作(即,HI风),使用高灵敏度HI线对高质量的恒星形成区域,双极分子外流已被检测到高灵敏度的刘等。HI风在这项工作中只检测到光束1。我们在这里发现,类似于低质量恒星的形成,无论有多大的倾角,HI风可能是足够强大的驱动分子外流。我们还发现,HI风中HI的丰度与同一束中HI窄线自吸收(HINSA)的丰度一致(即,梁1)。这意味着HI风和HINSA之间可能存在内在联系。这一结果也加强了HI风和检测到的分子外流相互关联的断言。

英文摘要:

We observed the high-mass star-forming region G176.51+00.20 using the Five-hundred-meter Aperture Spherical radio Telescope (FAST) with the 19-beam tracking observational mode. This is a pilot work of searching for neutral stellar winds traced by atomic hydrogen (i.e., HI winds) using the high sensitivity HI line toward high-mass star-forming regions where bipolar molecular outflows have been detected with high sensitivity by Liu et al. HI wind was detected in this work only in Beam 1. We find here that, similar to low-mass star formation, no matter how large the inclination is, the HI wind is likely sufficiently strong to drive a molecular outflow. We also find that the abundance of HI in the HI wind is consistent with that of the HI narrow-line self-absorption (HINSA) in the same beam (i.e., Beam 1). This implies that there is probably an internal relationship between HI winds and HINSA. This result also reinforces the assertion that HI winds and detected molecular outflows are associated with each other.

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