Molecular jet emission and a spectroscopic survey of S235AB
Molecular jet emission and a spectroscopic survey of S235AB
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S235AB 的分子射流发射和光谱研究
DOI：
10.1051/0004-6361/201527233
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发表时间：
2016
影响因子：
6.5
通讯作者：
H. Imai and T. Omodaka
中科院分区：
文献类型：
--
作者：
R. A. Burns;T. Handa;T. Hirota;K. Motogi;H. Imai and T. Omodaka
背景 S235AB 恒星形成区域包含一个巨大的年轻恒星物体，最近据报道显示出喷流旋转的可能证据——盘辅助恒星形成理论的一个虚幻但重要的组成部分。目的我们确认存在与喷流相对应的分子，并且我们还研究了 S235AB 中的分子环境。方法我们在热 SiO (J= 2-1,v= 0) 的线发射中寻找速度翼，这是一种冲击气体的示踪剂，这将表明存在喷气活动。利用我们调查中检测到的其他谱线，我们使用物种内跃迁、同位素和超精细跃迁的相对强度来推导 S235AB 中各种分子物种的不透明度、温度、柱密度和丰度。结果 SiO (J= 2–1,v= 0) 发射显示出速度翼在恒星速度上方和下方高达 75 km s-1，表明喷流的存在。分子环境描述了类似于热分子核心的进化阶段。
ContextThe S235AB star forming region houses a massive young stellar object which has recently been reported to exhibit possible evidence of jet rotation – an illusive yet crucial component of disk aided star formation theories.AimsWe confirm the presence of a molecular counterpart to the jet and we also study the molecular environment in S235AB.MethodsWe search for velocity wings in the line emission of thermal SiO (J= 2–1,v= 0), a tracer of shocked gas, which would indicate the presence of jet activity. Utilising other lines detected in our survey we use the relative intensities of intra species transitions, isotopes, and hyperfine transitions to derive opacities, temperatures, column densities, and abundances of various molecular species in S235AB.ResultsThe SiO (J= 2–1,v= 0) emission exhibits velocity wings of up to 75 km s-1above and below the velocity of the star, indicating the presence of a jet. The molecular environment describes an evolutionary stage resembling a hot molecular core.