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arXiv 2209.08504astro-ph.GAastro-ph.SR
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揭开Milky Way中隐藏的恒星聚集体:在盖亚EDR3中发现了1656个新的星团

Unveiling hidden stellar aggregates in the Milky Way: 1656 new star clusters found in Gaia EDR3

Zhihong He, Xiaochen Liu, Yangping Luo, Kun Wang, Qingquan Jiang

摘要:

我们使用盖亚EDR 3数据报告了在银河系盘(|b| <20度)中发现的1,656个超过1.2 kpc的新星团。基于无监督机器学习算法DBSCAN,在前人研究的基础上,采用独特的方法进行数据准备,得到聚类系数,为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,并提出了一些有趣的例子,包括一个球状星团候选者。通过匿名FTP到https://cdsarc.cds.unistra.fr/ftp/vizier.submit//he22c,可以在CDS上获得集群参数和成员星。我们检查了新发现并讨论了它们的统计特性。自行色散和半径的新集群是相同的,以前的报道。1.2千秒差距以上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的总数量为2,541个,相当于盖亚时代所有新公布星系团的55%。盖亚星团的编目数量也增加到近六千个。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确定。

英文摘要:

We report 1,656 new star clusters found in the Galactic disk (|b|<20 degrees) beyond 1.2 kpc, using Gaia EDR3 data. Based on an unsupervised machine learning algorithm, DBSCAN, and followed our previous studies, we utilized a unique method to do the data preparation and obtained the clustering coefficients, which proved to be an effective way to search blindly for star clusters. We tabulated the physical parameters and member stars of the new clusters, and presented some interesting examples, including a globular cluster candidate. The cluster parameters and member stars are available at CDS via anonymous ftp to https://cdsarc.cds.unistra.fr/ftp/vizier.submit//he22c. We examined the new discoveries and discussed their statistical properties. The proper motion dispersions and radii of the new clusters were the same as the previously reported ones. The new star clusters beyond 1.2 kpc were older than those in the solar neighborhood, and the new objects found in the third Galactic quadrant presented the lowest line-of-sight extinctions. Combined with our previous results, the total population of new clusters detected through our method was 2,541, corresponding to 55% of all newly published clusters in the Gaia era. The number of cataloged Gaia star clusters was also increased to nearly six thousand. In the near future, it is necessary to make a unified confirmation and member star determination for all reported clusters.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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