用CORNISH和ATLASGAL寻找孤立形成的大质量恒星
A search for High Mass Stars Forming in Isolation using CORNISH & ATLASGAL
摘要：
高质量恒星形成的理论模型介于两种极端情况之间。在一个极端，所有的质量都来自一个最初受引力束缚的核心。在另一个极端，大部分质量来自星系团尺度的气体，它们位于初始核心边界之外。一种明确地表明高质量恒星可以通过前一种途径聚集气体的方法是找到一颗孤立形成的高质量恒星。利用最近可用的CORNISH和ATLASGAL银河平面调查数据，我们开发的样本选择标准，试图找到这样的对象。从大约200个来源的初始列表中，我们确定高质量恒星形成区G13.384+0.064为最有希望的候选者。该区域包含一个强大的无线电连续源，由早期的B型恒星提供动力。由红外线测量得到的热光度与此一致。然而，在ATLASGAL测量的亚毫米连续辐射，以及致密气体示踪剂，如HCO+（3-2）和N2 H+（3-2），表明这颗恒星周围的物质少于100 M $_{\odot}$。我们的结论是，这一地区确实是一个有前途的候选人的高质量的恒星孤立形成，但更深的近红外观测需要把一个更强的约束年轻的，较低质量的恒星在该地区的质量上限。最后，我们讨论了未来的研究所面临的挑战，证明一个给定的高质量恒星形成的孤立。
英文摘要：
Theoretical models of high mass star formation lie between two extreme scenarios. At one extreme, all the mass comes from an initially gravitationally-bound core. At the other extreme, the majority of the mass comes from cluster scale gas, which lies far outside the initial core boundary. One way to unambiguously show high mass stars can assemble their gas through the former route would be to find a high mass star forming in isolation. Making use of recently available CORNISH and ATLASGAL Galactic plane survey data, we develop sample selection criteria to try and find such an object. From an initial list of approximately 200 sources, we identify the high mass star forming region G13.384+0.064 as the most promising candidate. The region contains a strong radio continuum source, that is powered by an early B-type star. The bolometric luminosity, derived from infrared measurements, is consistent with this. However, sub-millimetre continuum emission, measured in ATLASGAL, as well as dense gas tracers, such as HCO+(3-2) and N2H+(3-2) indicate that there is less than 100 M$_{\odot}$ of material surrounding this star. We conclude that this region is indeed a promising candidate for a high mass star forming in isolation, but that deeper near-IR observations are required to put a stronger constraint on the upper mass limit of young, lower mass stars in the region. Finally, we discuss the challenges facing future studies in proving a given high mass star is forming in isolation.
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