Cuihua Du

Reconstructing the Stripping History of the Sagittarius Stream with Neural Networks

Jian Zhang, Cuihua Du, Mingji Deng +2

The Sagittarius (Sgr) Stream is produced by the ongoing disruption of the Sgr dwarf spheroidal (dSph) galaxy and is thought to contain multiple wraps that were stripped during diff…

Revisiting candidate high-velocity stars associated with the Sagittarius dwarf spheroidal galaxy

Jian Zhang, Cuihua Du, Mingji Deng +2

Hypervelocity stars (HVSs) are valuable tracers of extreme dynamical processes. The Sagittarius dwarf spheroidal galaxy (Sgr dSph), currently undergoing tidal disruption, offers a…

Chemical Properties and Sagittarius-induced Dynamical Perturbations of the GD-1 Stream

Haoyang Liu, Cuihua Du

In this study, we investigate the chemical properties of the GD-1 stream using cross-matched, data-driven elemental abundances. The results reveal no clear $α$ -knee in the [Mg/Fe]-…

A Low-mass Model of The Milky Way: The Disk Warp Resulting from A Galaxy Merger

Mingji Deng, Cuihua Du, Jian Zhang +2

Previous studies have shown that disk warps can result from galaxy mergers. Recent research indicates a noticeable decline in the rotation curve (RC) of the Milky Way (MW), suggest…

Kinematic, Elemental and Structural Dependences on Metallicity in the Galactic Bulge

Haoyang Liu, Cuihua Du, Zhongcheng Li +2

We selected Bulge stars from APOGEE DR17 cross-matched with astrometric data from \textit{Gaia} DR3. Bulge stars were divided into sub-samples with line-of-sight velocity dispersio…

astro-ph.GA2025★ 1 cited

CNN-Derived Elemental Abundances of LAMOST DR10 Giants: Implications for Galactic Substructures

Haoyang Liu, Cuihua Du, Mingji Deng +1

Stellar parameters and abundances provide crucial insights into stellar and Galactic evolution studies. In this work, we developed a convolutional neural network (CNN) to estimate…

Systematic search for blue hyper-velocity stars from LAMOST survey

Yongkang Sun, Yang Huang, Jifeng Liu +6

Hypervelocity stars (HVSs) represent a unique class of objects capable of escaping the gravitational pull of the Milky Way due to extreme acceleration events, such as close encount…

Investigate Substructures of the Inner Halo Using the StarGO Algorithm with APOGEE DR17

Zhongcheng Li, Cuihua Du, Haoyang Liu +1

We applied Stars' Galactic Origin (StarGO) algorithm in 7D space (i.e., [Fe/H], [Mg/Fe], [Al/Fe], $L_{z}$ , $J_{r}$ , $J_{z}$ , $E$ ) to analyze stars in the inner halo with APOGEE DR1…

Chemical Components in the Virgo Overdensity and Hercules-Aquila Cloud: hints of more than one merger event in GSE-like debris

Haoyang Liu, Cuihua Du, Thomas Donlon +1

Using elemental abundances for 1.26 million K giants in the LAMOST DR8 value-added catalog, we analyze the chemical abundances of the Virgo Overdensity (VOD) and Hercules-Aquila Cl…

Exploration of Halo Substructures in IoM Space with \textit{Gaia} DR3

Haoyang Liu, Cuihua Du, Dashuang Ye +2

Using kinematic data from the Gaia Data Release 3 catalog, along with metallicity estimates robustly derived from Gaia XP spectra, we have explored the Galactic stellar halo in sea…

A Potential Dynamical Origin of The Galactic Disk Warp: The Gaia-Sausage-Enceladus Major Merger

Mingji Deng, Cuihua Du, Yanbin Yang +2

Previous studies have revealed that the Galactic warp is a long-lived, nonsteady, and asymmetric structure. There is a need for a model that accounts for the warp's long-term evolu…

Compositions of the Hercules-Aquila Cloud and Virgo Over-density

Dashuang Ye, Cuihua Du, Mingji Deng +4

Based on a sample of K giant from Large sky Area Multi-Object fiber Spectroscopic Telescope (LAMOST) Data Release 8 and a sample of RR Lyrae (RRL) from \textit{Gaia} Data Release 3…