Distances to molecular clouds at high galactic latitudes based on Gaia DR2
Distances to molecular clouds at high galactic latitudes based on Gaia DR2
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基于 Gaia DR2 的高银河纬度分子云距离
DOI：
10.1051/0004-6361/201834337
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发表时间：
2019
影响因子：
6.5
通讯作者：
Walsh Andrew John
中科院分区：
文献类型：
--
作者：
Yan Qing Zeng;Zhang Bo;Xu Ye;Guo Sufen;Macquart Jean Pierre;Tang Zheng Hong;Walsh Andrew John
我们报告了银河系高纬度地区分子云的距离（|B|> 10°），来自视差和G带消光（AG）测量在第二个GaiaDR2。在贝叶斯分析的帮助下，我们通过识别分子云的断点AG和使用分子云周围的Gaiastars的断点AG来确定距离。我们使用附近的恒星形成区域，如猎户座，金牛座，仙王座和英仙座，其距离众所周知，以检查我们方法的可靠性。通过与已有结果的比较，我们发现用这种方法得到的分子云距离是可靠的。距离的系统误差约为5%。总共有52个分子云具有明确的距离，其中大部分位于银河系高纬度地区，我们首次为13个分子云提供了可靠的距离。
We report the distances of molecular clouds at high Galactic latitudes (|b| > 10°) derived from parallax andG-band extinction (AG) measurements in the secondGaiadata release,GaiaDR2. Aided by Bayesian analyses, we determined distances by identifying the breakpoint in the extinctionAGtoward molecular clouds and using the extinctionAGofGaiastars around molecular clouds to confirm the breakpoint. We used nearby star-forming regions, such as Orion, Taurus, Cepheus, and Perseus, whose distances are well known to examine the reliability of our method. By comparing with previous results, we found that the molecular cloud distances derived from this method are reliable. The systematic error in the distances is approximately 5%. In total, 52 molecular clouds have well-determined distances, most of which are at high Galactic latitudes, and we provide reliable distances for 13 molecular clouds for the first time.