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Reconstructing the Stripping History of the Sagittarius Stream with Neural Networks

  • Authors: Jian Zhang, Cuihua Du, Mingji Deng, Zhongcheng Li, Haoyang Liu

Jian Zhang et al 2026 The Astrophysical Journal 1003 .

  • Provider: AAS Journals

Caption: Figure 2.

Combined results from SEGUE, APOGEE, and LAMOST surveys. The main panels show the line-of-sight velocity relative to Λ for the Sgr Stream across four metallicity bins. Background gray, orange, and green scatter points represent particles from the V21 simulation classified as still-bound, young wrap (0 > Ts ≥ −2 Gyr), and old wrap (Ts < −2 Gyr), respectively. Overlaid symbols show observed Sgr Stream members: circles for SEGUE, triangles for APOGEE, and diamonds for LAMOST. Red symbols indicate stars with Ts ≥ −2 Gyr, while blue symbols indicate Ts < −2 Gyr. The left panels display stripping time distributions for observed stars within each metallicity bin. The figure demonstrates that as metallicity decreases, the fraction of young wraps decreases while old wraps increase.

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