Salt-bearing Disk Candidates around High-mass Young Stellar Objects
Salt-bearing Disk Candidates around High-mass Young Stellar Objects
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DOI：
10.3847/1538-4357/ac9f4a
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发表时间：
2022-11
期刊：
影响因子：
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通讯作者：
A. Ginsburg;B. McGuire;P. Sanhueza;F. Olguin;L. Maud;Kei E. I. Tanaka;Yichen Zhang;H. Beuther
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文献类型：
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作者：
A. Ginsburg;B. McGuire;P. Sanhueza;F. Olguin;L. Maud;Kei E. I. Tanaka;Yichen Zhang;H. Beuther
在定义明确的圆盘中，追踪气体轨道运动的分子谱线是推断圆盘及其周围星星性质的宝贵工具。只从圆盘中产生的谱线，而不是从诞生星星的周围分子云核心或从它驱动的外流中产生的谱线，是很罕见的。最近在一个例子中发现了几条这样的发射线，这些发射线来自NaCl和KCl盐分子。我们研究了17个高质量恒星形成区域中的23个候选高质量年轻恒星天体（HMYSO）的样本，以确定这些物种的发射频率。我们提出了五个新的检测水，氯化钠，氯化钾，PN，和硅从周围的物体最里面的区域，使已知的盐水盘候选人的总数为9。它们的运动学结构通常是盘状的，尽管我们无法确定它们是否来自盘或新探测到的源中的流出。我们表明，这些物种在空间上是一致的，在一些解决的情况下，并表明，他们通常被检测到一起，这表明一个共同的起源或激发机制。我们还表明，几个磁盘周围的HMYSOs显然没有表现出在这些物种的排放。因此，盐盘在高质量盘中既不是特别罕见，也不是普遍存在的。
Molecular lines tracing the orbital motion of gas in a well-defined disk are valuable tools for inferring both the properties of the disk and the star it surrounds. Lines that arise only from a disk, and not also from the surrounding molecular cloud core that birthed the star or from the outflow it drives, are rare. Several such emission lines have recently been discovered in one example case, those from NaCl and KCl salt molecules. We studied a sample of 23 candidate high-mass young stellar objects (HMYSOs) in 17 high-mass star-forming regions to determine how frequently emission from these species is detected. We present five new detections of water, NaCl, KCl, PN, and SiS from the innermost regions around the objects, bringing the total number of known briny disk candidates to nine. Their kinematic structure is generally disk-like, though we are unable to determine whether they arise from a disk or outflow in the sources with new detections. We demonstrate that these species are spatially coincident in a few resolved cases and show that they are generally detected together, suggesting a common origin or excitation mechanism. We also show that several disks around HMYSOs clearly do not exhibit emission in these species. Salty disks are therefore neither particularly rare in high-mass disks, nor are they ubiquitous.