论文标题
以银河系方式进行的4-6 GHz无线电重组线调查
A 4-6 GHz Radio Recombination Line Survey in the Milky Way
论文作者
论文摘要
我们进行了一条无线电重组线（RRL）调查，以银河系的方式构建一个高质量星形成区域（HMSFR）样本，该样本基于全套宽阔的红外红外调查Explorer（$ \ textit {allwise} $）点源目录。该调查是在上海6500万台马射电望远镜（TMRT）中观察到的，涵盖了10种氢RRL转变，范围从H98 $α$到H113 $α$（对应于4.5 $ -6.9 GHz的休息频率）。在3348个选定的目标中，我们确定了一个由RRL所追踪的517个来源组成的HMSFR样本，该样本中很大一部分（486）位于银河平面附近（$ | $ | $ | $ | textit {b} $ $ $ $ $ $ $ $ <$ <$ <$ <$ 2度）。除氢RRL外，我们还分别检测到49和23来源的氦气和碳RRL。我们与先前的6.7甲醇Maser源在同一目标样本中建立的6.7甲醇Maser源进行了交叉匹配，因此发现103 HMSFR源可携带这两种排放量。在本文中，我们介绍了HMSFR目录，并伴随着测量的RRL线特性，并与我们的甲醇Maser样品呈现相关性，据信这在早期阶段捕捉了巨大的恒星。由不同示踪剂指示的各种进化阶段中的源头组成的HMSFR样品的构建对于未来对此类地区的高质量恒星形成的研究至关重要。
We performed a radio recombination line (RRL) survey to construct a high-mass star-forming region (HMSFR) sample in the Milky Way based on the all-sky Wide-Field Infrared Survey Explorer ($\textit{All-WISE}$) point source catalog. The survey was observed with the Shanghai 65m Tianma radio telescope (TMRT) covering 10 hydrogen RRL transitions ranging from H98$α$ to H113$α$ (corresponding to the rest frequencies of 4.5$-$6.9 GHz) simultaneously. Out of 3348 selected targets, we identified an HMSFR sample consisting of 517 sources traced by RRLs, a large fraction of this sample (486) locate near the Galactic plane ($|$$\textit{b}$$|$ $<$ 2 deg). In addition to the hydrogen RRLs, we also detected helium and carbon RRLs towards 49 and 23 sources respectively. We cross-match the RRL detections with the 6.7 methanol maser sources built up in previous works for the same target sample, as a result, 103 HMSFR sources were found to harbor both emissions. In this paper, we present the HMSFR catalog accompanied by the measured RRL line properties and a correlation with our methanol maser sample, which is believed to tracer massive stars at earlier stages. The construction of an HMSFR sample consisting of sources in various evolutionary stages indicated by different tracers is fundamental for future studies of high-mass star formation in such regions.
