Evidence for Radial Expansion at the Core of the Orion Complex with Gaia EDR3
Evidence for Radial Expansion at the Core of the Orion Complex with Gaia EDR3
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DOI：
10.3847/1538-4357/ac0633
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发表时间：
2021-01
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通讯作者：
Cameren N. Swiggum;E. D’Onghia;J. Alves;J. Großschedl;M. Foley;C. Zucker;S. Meingast;Boquan Chen-Boquan
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作者：
Cameren N. Swiggum;E. D’Onghia;J. Alves;J. Großschedl;M. Foley;C. Zucker;S. Meingast;Boquan Chen-Boquan
我们提出了一个相空间研究的两个恒星群位于猎户座复杂的核心：Briceño-1和猎户座带人口近（OBP近）。我们用无监督聚类算法，共享最近邻（SNN），以前确定了12个新的恒星子结构的猎户座复杂的群体。对于这两个组中的每一个，我们使用盖亚EDR 3自行补充径向速度从盖亚DR 2，APOGEE-2和GALAH DR 3推导出单个恒星的三维空间运动。我们提出的证据表明，两组从一个共同的中心径向扩张。与以前的工作不同，我们的研究表明，恒星群膨胀的证据仅限于OBP-near和Briceño-1，而复合体中的其他恒星群则表现出更复杂的运动。有趣的是，这两组恒星位于尘埃壳的中心，正如现存的3D尘埃图所显示的那样。产生这种相干运动的确切机制尚不清楚，而观测到的径向膨胀和尘埃壳表明，大规模的恒星反馈可能影响了这些群体的星星形成历史。
We present a phase-space study of two stellar groups located at the core of the Orion Complex: Briceño-1 and Orion Belt Population-near (OBP-near). We identify the groups with the unsupervised clustering algorithm, Shared Nearest Neighbor (SNN), which previously identified 12 new stellar substructures in the Orion Complex. For each of the two groups, we derive the 3D space motions of individual stars using Gaia EDR3 proper motions supplemented by radial velocities from Gaia DR2, APOGEE-2, and GALAH DR3. We present evidence for radial expansion of the two groups from a common center. Unlike previous work, our study suggests that evidence of stellar group expansion is confined only to OBP-near and Briceño-1, whereas the rest of the groups in the complex show more complicated motions. Interestingly, the stars in the two groups lie at the center of a dust shell, as revealed via an extant 3D dust map. The exact mechanism that produces such coherent motions remains unclear, while the observed radial expansion and dust shell suggest that massive stellar feedback could have influenced the star formation history of these groups.