Young O-rich Stars Migrated from the Outer Disc: Imprints of Sagittarius Accretion Event

The Milky Way underwent significant transformations in its early history, characterised by violent mergers and satellite galaxy accretion. However, recent observations reveal notable star formation events over the past 4 Gyr, likely triggered by perturbations from the Sagittarius dwarf galaxy. Here,...

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Bibliographic Details
Published in:arXiv.org 2024-12
Main Authors: Sun, Tiancheng, Bi, Shaolan, Chen, Xunzhou, Chen, Yuqin, Yuxi, Lu, Liu, Chao, Buck, Tobias, Zhang, Xianfei, Tanda, Li, Li, Yaguang, Wu, Yaqian, Ge, Zhishuai, Ye, Lifei
Format: Article
Language:English
Subjects:
Abundance
Chemical evolution
Deposition
Dwarf galaxies
Enceladus
Perturbation
Shape
Star & galaxy formation
Star formation
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Summary:The Milky Way underwent significant transformations in its early history, characterised by violent mergers and satellite galaxy accretion. However, recent observations reveal notable star formation events over the past 4 Gyr, likely triggered by perturbations from the Sagittarius dwarf galaxy. Here, we present chemical signatures of this accretion event, using the [Fe/H] and [O/Fe] ratios of thin disc stars. In the normalised age-metallicity plane, we identify a discontinuous V-shape structure at z\(_{\rm max}\) \(
ISSN:2331-8422