RMS巡天：北银道面候选大质量YSO的$^{13}$ CO观测
The RMS Survey: $^{13}$CO observations of candidate massive YSOs in the northern Galactic plane
摘要：
内容：红MSX源巡天是一个正在进行的多波长观测方案，旨在传回大质量年轻恒星物体的大、高分辨率中红外色选样本。目的：我们后续计划的一个关键部分是进行13 CO分子线观测，以确定我们所有MYSO候选者的运动学距离。这些距离将使我们能够识别和移除附近的低质量YSO，并帮助识别弱CO发射体的演化恒星。方法：我们利用15 m詹姆斯·克拉克·麦克斯韦望远镜（JCMT）、紫金山天文台（PMO）13.7 m望远镜、20 m Onsala望远镜和22 m Mopra望远镜对位于第一、第二象限的508颗MYSO候选星进行了分子谱线观测。结果：我们检测到780个RMS源的13 CO排放，约占观察到的排放（911）的84%。总共检测到2595种高于3 σ水平的排放成分（通常T^*_{ \rm{A} } > 0.3K），其中大多数来源（520个来源（约56%））都观察到多种成分，平均每条视线检测到约4个分子云。我们已经使用档案CS（J=2-1）和脉泽速度来解决组件的多重性对175个源（~20%），并推导出一个标准，用于确定最有可能的组件为进一步的191多个组件源。结合单组分检测，我们已经获得了明确的运动速度为638 780 MYSO的候选人对CO的检测（约80%的检测）。使用银河系的旋转曲线，我们计算所有检测到的组件的运动距离。
英文摘要：
Context: The Red MSX Source (RMS) survey is an ongoing multi-wavelength observational programme designed to return a large, high-resolution mid-infrared colour-selected sample of massive young stellar objects. Aims: A critical part of our follow-up programme is to conduct 13CO molecular line observations in order to determine kinematic distances to all of our MYSO candidates. These distances will allow us to identify and remove nearby low-mass YSOs and help in identifying evolved stars which are weak CO emitters. Method: We have used the 15 m James Clerk Maxwell Telescope (JCMT), the 13.7 m telescope of the Purple Mountain Observatory (PMO), the 20 m Onsala telescope and the 22m Mopra telescope to conduct molecular line observations towards 508 MYSOs candidates located in the 1st and 2nd Quadrants. Results: We detect 13CO emission towards 780 RMS sources which corresponds to approximately 84% of those observed (911). A total of 2595 emission components are detected above 3sigma level (typically T^*_{\rm{A}} > 0.3K), with multiple components being observed towards the majority of these sources -- 520 sources (~56%) -- with an average of ~4 molecular clouds detected along each line of sight. We have used archival CS (J=2-1) and maser velocities to resolve the component multiplicity towards 175 sources (~20%) and have derived a criterion which is used to identify the most likely component for a further 191 multiple component sources. Combined with the single component detections we have obtained unambiguous kinematic velocities for 638 of the 780 MYSOs candidates towards which CO is detected (~80% of the detections). Using the Galactic rotation curve we calculate kinematic distances for all detected components.
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