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• W2930623218 startingPage "1235" @default.
• W2930623218 abstract "Abstract The Gaia Sausage is the major accretion event that built the stellar halo of the Milky Way galaxy. Here, we provide dynamical and chemical evidence for a second substantial accretion episode, distinct from the Gaia Sausage. The Sequoia Event provided the bulk of the high-energy retrograde stars in the stellar halo, as well as the recently discovered globular cluster FSR 1758. There are up to six further globular clusters, including ω Centauri, as well as many of the retrograde substructures in Myeong et al., associated with the progenitor dwarf galaxy, named the Sequoia. The stellar mass in the Sequoia galaxy is ∼5 × 10 M⊙ , whilst the total mass is ∼1010 M⊙ , as judged from abundance matching or from the total sum of the globular cluster mass. Although clearly less massive than the Sausage, the Sequoia has a distinct chemodynamical signature. The strongly retrograde Sequoia stars have a typical eccentricity of ∼0.6, whereas the Sausage stars have no clear net rotation and move on predominantly radial orbits. On average, the Sequoia stars have lower metallicity by ∼0.3 dex and higher abundance ratios as compared to the Sausage. We conjecture that the Sausage and the Sequoia galaxies may have been associated and accreted at a comparable epoch." @default.
• W2930623218 created "2019-04-11" @default.
• W2930623218 creator A5025595718 @default.
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• W2930623218 creator A5059478292 @default.
• W2930623218 date "2019-07-01" @default.
• W2930623218 modified "2023-10-03" @default.
• W2930623218 title "Evidence for two early accretion events that built the Milky Way stellar halo" @default.
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• W2930623218 doi "https://doi.org/10.1093/mnras/stz1770" @default.
• W2930623218 hasPublicationYear "2019" @default.
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