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arXiv 1904.04085astro-ph.SRastro-ph.GA
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使用盖亚数据发布2对巨蛇座分子云内最近恒星形成的程度和结构的初步概述

An initial overview of the extent and structure of recent star formation within the Serpens Molecular Cloud using Gaia Data Release 2

Gregory J. Herczeg, Michael A. Kuhn, Xingyu Zhou, Jennifer Hatchell, Carlo Felice Manara, Doug Johnstone, Michael M. Dunham, Anupam Bhardwaj, Jessy Jose, Zhen Yuan

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25 pages, accepted by ApJ
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摘要：

巨蛇座分子云中的密集星团是附近恒星形成最活跃的区域之一。在本文中，我们使用盖亚DR 2的松弛和自行统计测量1167运动学成员的巨蛇座，其中很少有以前确定的，以评估复杂的恒星形成历史。巨蛇座星系团的光学成员集中在三个不同的星系团中，位于380到480 pc之间;致密星系团仍然被光学厚的尘埃高度遮蔽，光学成员很少。巨蛇座星系中的年轻恒星和原恒星的总数至少有2000颗，包括过去对原恒星和盘最敏感的调查，可能要高得多。从恒星数量的不足测量到的到暗云的距离与到光学星团的距离是一致的。巨蛇座分子云位于天鹰座裂谷的前景，乌云位于600到700 pc，在斑片状灭绝的后面，这里称为巨蛇座卷云，位于约250 pc。基于缺乏一个分布的人口较老的恒星，恒星形成率在整个巨蛇座分子云增加了至少一个20倍，在过去的~5百万年。巨蛇座东北部的光学明亮恒星之所以可见，是因为它们的诞生分子云已经被侵蚀，而不是因为它们从恒星形成的中心工厂被向外抛出。20到100 pc的子星团之间的分离和缺乏老年人口导致猜测，需要外部强迫来触发活跃的恒星形成。

英文摘要：

The dense clusters within the Serpens Molecular Cloud are among the most active regions of nearby star formation. In this paper, we use Gaia DR2 parallaxes and proper motions to statistically measure 1167 kinematic members of Serpens, few of which were previously identified, to evaluate the star formation history of the complex. The optical members of Serpens are concentrated in three distinct groups located at 380 to 480 pc; the densest clusters are still highly obscured by optically-thick dust and have few optical members. The total population of young stars and protostars in Serpens is at least 2000 stars, including past surveys that were most sensitive to protostars and disks, and may be far higher. Distances to dark clouds measured from deficits in star counts are consistent with the distances to the optical star clusters. The Serpens Molecular Cloud is seen in the foreground of the Aquila Rift, dark clouds located at 600 to 700 pc, and behind patchy extinction, here called the Serpens Cirrus, located at ~250 pc. Based on the lack of a distributed population of older stars, the star formation rate throughout the Serpens Molecular Cloud increased by at least a factor of 20 within the past ~5 Myr. The optically bright stars in Serpens Northeast are visible because their natal molecular cloud has been eroded and not because they were flung outwards from a central factory of star formation. The separation between subclusters of 20 to 100 pc and the absence of an older population leads to speculation that an external forcing was needed to trigger the active star formation.

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