RMS巡天：南半球候选大质量YSO的13 CO观测
The RMS Survey: 13CO observations of candidate massive YSOs in the southern hemisphere
摘要：
摘要：红色MSX源（RMS）巡天是一个正在进行的多波长观测方案，旨在返回大量精心挑选的大质量年轻恒星天体（MYSO）样本。在这里，我们提出了对位于第三和第四象限的854个MYSO候选人的13 CO观测。我们检测到13 CO排放对共751的854 RMS源观察（~88%）。总共检测到2185种高于3 $σ$水平的排放组分。对大多数这些来源（455个来源（约60%））观察到多个发射剖面，沿视线平均约有4个分子云。这些多重发射特征使得很难为我们的许多样本分配运动学速度。我们已经使用档案CS（J=2-1）和脉泽速度解决组件的多重性对82个源，并已推导出一个标准，这是用来确定最有可能的组件为进一步202多个组件源。结合单分量检测，我们已经获得了明确的运动速度对580个源（~80%的检测）。我们无法确定运动速度的171个震源将需要额外的线数据。使用Brand和Blitz（1993）的旋转曲线和它们的径向速度，我们计算所有检测到的分量的运动学距离。
英文摘要：
Abridged: The Red MSX Source (RMS) survey is an ongoing multi-wavelength observational programme designed to return a large, well-selected sample of massive young stellar objects (MYSOs). Here we present 13CO observations made towards 854 MYSOs candidates located in the 3rd and 4th quadrants. We detected 13CO emission towards a total of 751 of the 854 RMS sources observed (~88%). In total 2185 emission components are detected above 3$σ$ level. Multiple emission profiles are observed towards the majority of these sources - 455 sources (~60%) - with an average of ~4 molecular clouds along the line of sight. These multiple emission features make it difficult to assign a kinematic velocity to many of our sample. We have used archival CS (J=2-1) and maser velocities to resolved the component multiplicity towards 82 sources and have derived a criterion which is used to identify the most likely component for a further 202 multiple component sources. Combined with the single component detections we have obtained unambiguous kinematic velocities towards 580 sources (~80% of the detections). The 171 sources for which we have not been able to determine the kinematic velocity will require additional line data. Using the rotation curve of Brand and Blitz (1993) and their radial velocities we calculate kinematic distances for all components detected.
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