92 citations · 343 across the 16 of their papers we have counts for
16 papers
Estimating accretion times of halo substructures in the Milky Way
Hefan Li, Masashi Chiba, Xiang-Xiang Xue +1
To unravel the formation history of the Milky Way, we estimate the accretion times of six phase-space substructures in the stellar halo, using the orbital frequencies toward two sp…
The origin of High-velocity stars considering the impact of the Large Magellanic Cloud
Jiwei Liao, Cuihua Du, Mingji Deng +5
Utilizing astrometric parameters sourced from \textit{Gaia} Data Release 3 and radial velocities obtained from various spectroscopic surveys, we identify 519 high-velocity stars (H…
The accretion history of the Milky Way. II. Internal kinematics of globular clusters and of dwarf galaxies
Francois Hammer, Jianling Wang, Gary A. Mamon +7
We study how structural properties of globular clusters and dwarf galaxies are linked to their orbits in the Milky Way halo. From the inner to the outer halo, orbital energy increa…
The accretion history of the Milky Way. I. How it shapes globular clusters and dwarf galaxies
Francois Hammer, Hefan Li, Gary A. Mamon +6
Halo inhabitants are individual stars, stellar streams, star and globular clusters, and dwarf galaxies. Here we compare the two last categories that include objects of similar stel…
60 candidate high-velocity stars originating from the Sagittarius dwarf spheroidal galaxy in Gaia EDR3
Hefan Li, Cuihua Du, Jun Ma +3
Using proper motions from Gaia Early Data Release 3 (Gaia EDR 3) and radial velocities from several surveys, we identify 60 candidate high-velocity stars with total velocity greate…
Gaia EDR3 proper motions of Milky Way dwarfs. II: Velocities, Total Energy and Angular Momentum
François Hammer, Jianling Wang, Marcel Pawlowski +5
Here we show that precise Gaia EDR3 proper motions have provided robust estimates of 3D velocities, angular momentum and total energy for 40 Milky Way dwarfs. The results are stati…
Gaia EDR3 proper motions of Milky Way dwarfs I: 3D Motions and Orbits
Hefan Li, Francois Hammer, Carine Babusiaux +5
Based on Gaia Early Data Release 3 (EDR3), we estimate the proper motions for 46 dwarf spheroidal galaxies (dSphs) of the Milky Way. The uncertainties in proper motions, determined…
Two substructures in the nearby stellar halo found in Gaia and RAVE
Hefan Li, Cuihua Du, Yanbin Yang +4
We use the second Gaia data release (Gaia DR2), combined with RAVE spectroscopic surveys, to identify the substructures in the nearby stellar halo. We select 3,845 halo stars kinem…
Existence of the Metal-Rich Stellar Halo and High-velocity Thick Disk in the Galaxy
Yepeng Yan, Cuihua Du, Hefan Li +3
Based on the second Gaia data release (DR2), combined with the LAMOST and APOGEE spectroscopic surveys, we study the kinematics and metallicity distribution of the high-velocity st…
Most dwarf spheroidal galaxies surrounding the Milky Way cannot be dark-matter dominated satellites
Francois Hammer, Yanbin Yang, Frederic Arenou +5
Milky Way dwarf spheroidal galaxies are the tiniest observed galaxies and are currently associated with the largest fractions of dark matter, which is revealed by their too large v…
Orbital evidences for dark-matter-free Milky Way dwarf spheroidal galaxies
Francois Hammer, Yanbin Yang, Frederic Arenou +4
The nature of Milky Way dwarf spheroidals (MW dSphs) has been questioned, in particular whether they are dominated by dark matter (DM). Here we investigate an alternative scenario,…
New nearby hypervelocity stars and their spatial distribution from Gaia DR2
Cuihua Du, Hefan Li, Yepeng Yan +5
Base on about 4,500 large tangential velocity () with high-precision proper motions and parallaxes in Gaia DR2 5D information derived from p…
Chemical and Kinematic Properties of the Galactic Disk from the LAMOST and Gaia Sample Stars
Yepeng Yan, Cuihua Du, Shuai Liu +5
We determined the chemical and kinematic properties of the Galactic thin and thick disk using a sample of 307,246 A/F/G/K-type giant stars from the LAMOST spectroscopic survey and…
The substructures in the local stellar halo from Gaia and LAMOST
Hefan Li, Cuihua Du, Shuai Liu +2
Based on the second Gaia data release (Gaia DR2) and spectroscopy from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Data, we identified 20,089 halo stars…
The origin of high velocity stars from Gaia and LAMOST
Cuihua Du, Hefan Li, Heidi Jo Newberg +4
Based on the second Gaia data (Gaia DR2) and spectroscopy from the LAMOST Data Release 5, we defined the high-velocity (HiVel) stars sample as those stars with $v_{\mathrm{gc}} > 0…
The high velocity stars in the Local Stellar Halo from Gaia and LAMOST
Cuihua Du, Hefan Li, Shuai Liu +2
Based on the first Gaia data release and spectroscopy from the LAMOST Data Release 4, we study the kinematics and chemistry of the local halo stars. The halo stars are identified k…