Unveiling Hidden Stellar Aggregates in the Milky Way: 1656 New Star Clusters Found in Gaia EDR3
Unveiling Hidden Stellar Aggregates in the Milky Way: 1656 New Star Clusters Found in Gaia EDR3
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DOI：
10.3847/1538-4365/ac9af8
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发表时间：
2022-09
期刊：
影响因子：
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通讯作者：
Zhihong He;Xiaochen Liu;Yangping Luo;Kun Wang;Qingquan Jiang
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作者：
Zhihong He;Xiaochen Liu;Yangping Luo;Kun Wang;Qingquan Jiang
利用盖亚EDR3的观测数据，在银盘（B角< 20°）中发现了1656个1.2kpc以上的新星星团。基于无监督机器学习算法DBSCAN，在前人研究的基础上，采用一种独特的方法进行数据准备和聚类系数的获取，为星星团的盲搜索提供了一种有效的方法。我们列出了新星团的物理参数和成员星，并给出了一些有趣的例子，包括一个球状星团候选者。星团参数和成员星可以在在线期刊中以机器可读的格式获得。我们将研究这些新发现并讨论它们的统计特性。星星团的自行色散和半径与以前报道的结果相同。超过1.2千秒差距的新星团比太阳附近的星团更老，在银河系第三象限发现的新天体呈现出最低的视线距离。结合我们之前的结果，通过我们的方法检测到的新星系团和候选星系团的总数量为2541个，相当于盖亚时代所有新公布星系团的55%。已编目的盖亚星星团的数量也增加到近6000个。在不久的将来，有必要对所有已报道的星团进行统一的确认和成员星星确定。
We report 1656 new star clusters found in the Galactic disk (∣b∣ < 20°) beyond 1.2 kpc, using Gaia EDR3 data. Based on an unsupervised machine-learning algorithm, DBSCAN, and following our previous studies, we utilized a unique method to do the data preparation and obtain the clustering coefficients, which proved to be an effective way to search blindly for star clusters. We tabulate the physical parameters and member stars of the new clusters, and present some interesting examples, including a globular cluster candidate. The cluster parameters and member stars are available in machine-readable format in the online journal. We examine the new discoveries and discuss their statistical properties. The proper-motion dispersions and radii of the star clusters are the same as those previously reported. The new clusters beyond 1.2 kpc are older than those in the solar neighborhood, and the new objects found in the third Galactic quadrant present the lowest line-of-sight extinctions. Combined with our previous results, the total population of new clusters and candidates detected through our method is 2541, corresponding to 55% of all newly published clusters in the Gaia era. The number of cataloged Gaia star clusters was also increased to nearly 6000. In the near future, it will be necessary to make a unified confirmation and member star determination for all reported clusters.