巨大分子云中大质量恒星形成的位置、成团和传播
The location, clustering, and propagation of massive star formation in giant molecular clouds
摘要：
大质量恒星是星系演化的关键角色，但它们的形成途径仍不清楚。在这项工作中，我们使用几个星系范围内的调查数据，建立一个公正的数据集的约700个大质量的年轻恒星物体（MYSO），约200个巨大的分子云（GMC），约100个年轻（<10百万年）的光学星团（SC）在大麦云云。我们利用这些数据来定量研究大质量恒星形成的位置和集群及其与GMC内部结构的关系。我们发现，大质量恒星通常不会形成在最高的柱密度，也不是他们的父母GMC中心在我们的观测的~6 pc分辨率。大质量的恒星形成集群在多个世代和规模远小于母GMC的大小。我们发现，大质量的恒星形成显着提高附近的SC云。然而，云是否与SC相关并不取决于云的质量或全球表面密度。这些结果揭示了在长达1000万年的时间尺度上不同代大质量恒星之间的联系。我们比较我们的工作与银河系的研究，并讨论我们的研究结果在GMC崩溃，触发恒星形成，低和高质量恒星形成之间的潜在二分法。
英文摘要：
Massive stars are key players in the evolution of galaxies, yet their formation pathway remains unclear. In this work, we use data from several galaxy-wide surveys to build an unbiased dataset of ~700 massive young stellar objects (MYSOs), ~200 giant molecular clouds (GMCs), and ~100 young (<10 Myr) optical stellar clusters (SCs) in the Large Magellanic Cloud. We employ this data to quantitatively study the location and clustering of massive star formation and its relation to the internal structure of GMCs. We reveal that massive stars do not typically form at the highest column densities nor centers of their parent GMCs at the ~6 pc resolution of our observations. Massive star formation clusters over multiple generations and on size scales much smaller than the size of the parent GMC. We find that massive star formation is significantly boosted in clouds near SCs. Yet, whether a cloud is associated with a SC does not depend on either the cloud's mass or global surface density. These results reveal a connection between different generations of massive stars on timescales up to 10 Myr. We compare our work with Galactic studies and discuss our findings in terms of GMC collapse, triggered star formation, and a potential dichotomy between low- and high-mass star formation.
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