Potential impact of the Sagittarius dwarf galaxy on the formation of young O-rich stars

Tiancheng Sun, Shaolan Bi (), Xunzhou Chen (), Yuqin Chen, Yuxi Lucy Lu, Chao Liu, Tobias Buck, Xianfei Zhang, Tanda Li, Yaguang Li, Yaqian Wu, Zhishuai Ge and Lifei Ye
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Tiancheng Sun: Beijing Normal University
Shaolan Bi: Beijing Normal University
Xunzhou Chen: Zhejiang Laboratory
Yuqin Chen: Beijing Normal University
Yuxi Lucy Lu: Central Park West
Chao Liu: Beijing Normal University
Tobias Buck: Interdisziplinäres Zentrum für Wissenschaftliches Rechnen
Xianfei Zhang: Beijing Normal University
Tanda Li: Beijing Normal University
Yaguang Li: University of Hawai’i
Yaqian Wu: National Astronomical Observatories
Zhishuai Ge: Beijing Academy of Science and Technology
Lifei Ye: Beijing Normal University

Nature Communications, 2025, vol. 16, issue 1, 1-12

Abstract: Abstract 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] (metallicity) and [O/Fe] (oxygen abundance) ratios of thin-disc stars. In the normalised age-metallicity plane, we identify a discontinuous V-shape structure at $${{{{\rm{z}}}}}_{\max }$$ z max (maximum vertical distance from the disc plane)

Date: 2025
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DOI: 10.1038/s41467-025-56550-1

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