Evidence for Radial Expansion at the Core of the Orion Complex with Gaia EDR3

Autor(en)

Cameren Swiggum, Elena D'Onghia, João Alves, Josefa Großschedl, Michael Foley, Catherine Zucker, Stefan Meingast, Boquan Chen, Alyssa Goodman

Abstrakt

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.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

University of Wisconsin, Madison, Harvard-Smithsonian Center for Astrophysics, The University of Sydney

Journal

The Astrophysical Journal

Band

917

Anzahl der Seiten

12

ISSN

0004-637X

DOI

https://doi.org/10.3847/1538-4357/ac0633

Publikationsdatum

08-2021

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie, 103004 Astrophysik

Schlagwörter

ASJC Scopus Sachgebiete

Astronomy and Astrophysics, Space and Planetary Science

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/662c0e08-83b0-4a72-83f4-0029bbae1ead