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

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  • Tiancheng Sun

    (Beijing Normal University
    Beijing Normal University
    National Astronomical Observatories)

  • Shaolan Bi

    (Beijing Normal University
    Beijing Normal University)

  • Xunzhou Chen

    (Zhejiang Laboratory
    Hangzhou Dianzi University)

  • Yuqin Chen

    (Beijing Normal University
    National Astronomical Observatories
    University of Chinese Academy of Sciences)

  • Yuxi Lucy Lu

    (Central Park West
    The Ohio State University
    The Ohio State University)

  • Chao Liu

    (Beijing Normal University
    National Astronomical Observatories
    University of Chinese Academy of Sciences)

  • Tobias Buck

    (Interdisziplinäres Zentrum für Wissenschaftliches Rechnen
    Zentrum für Astronomie, Institut für Theoretische Astrophysik)

  • Xianfei Zhang

    (Beijing Normal University
    Beijing Normal University)

  • Tanda Li

    (Beijing Normal University
    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
    Beijing Normal University)

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)

Suggested Citation

  • 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 & Lifei Ye, 2025. "Potential impact of the Sagittarius dwarf galaxy on the formation of young O-rich stars," Nature Communications, Nature, vol. 16(1), pages 1-12, December.
    • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-56550-1
    DOI: 10.1038/s41467-025-56550-1
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    References listed on IDEAS

    as
    1. Maosheng Xiang & Hans-Walter Rix, 2022. "A time-resolved picture of our Milky Way’s early formation history," Nature, Nature, vol. 603(7902), pages 599-603, March.
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