Astrophysics > Astrophysics of Galaxies
[Submitted on 25 Jan 2021 (v1), last revised 17 May 2021 (this version, v3)]
Title:Evidence for Radial Expansion at the Core of the Orion Complex with Gaia EDR3
View PDFAbstract: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 twelve 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.
Submission history
From: Cameren Swiggum [view email][v1] Mon, 25 Jan 2021 20:00:05 UTC (2,960 KB)
[v2] Wed, 27 Jan 2021 04:05:22 UTC (2,960 KB)
[v3] Mon, 17 May 2021 19:36:58 UTC (3,247 KB)
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