Zobrazeno 1 - 10
of 100
pro vyhledávání: '"Du, Cuihua"'
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, we investigate the compositions of the Hercules-Aquila Cloud (HAC) a
Externí odkaz:
http://arxiv.org/abs/2407.03713
The existence of intermediate-mass black holes (IMBHs) is crucial for understanding various astrophysical phenomena, yet their existence remains elusive, except for the LIGO-Virgo detection. We report the discovery of a high-velocity star J0731+3717,
Externí odkaz:
http://arxiv.org/abs/2406.00923
Autor:
Liao, Jiwei, Du, Cuihua, Deng, Mingji, Ye, Dashuang, Li, Hefan, Huang, Yang, Shi, Jianrong, Ma, Jun
Utilizing astrometric parameters sourced from \textit{Gaia} Data Release 3 and radial velocities obtained from various spectroscopic surveys, we identify 519 high-velocity stars (HiVels) with a total velocity in the Galactocentric restframe greater t
Externí odkaz:
http://arxiv.org/abs/2401.02017
Based on 4,\,098 very metal-poor (VMP) stars with 6D phase-space and chemical information from \textit{Gaia} DR3 and LAMOST DR9 as tracers, we apply an unsupervised machine learning algorithm, Shared Nearest Neighbor (SNN), to identify stellar groups
Externí odkaz:
http://arxiv.org/abs/2312.07825
Based on the \textit{Gaia} DR3 RR Lyrae catalog, we use two methods to fit the density profiles with an improved broken power law, and find that there are two break radii coinciding with the two apocenter pile-ups of high-eccentricity Gaia-Sausage-En
Externí odkaz:
http://arxiv.org/abs/2307.16378
Publikováno v:
A&A 669, A107 (2023)
As heating processes can broaden the distributions of radial actions and the vertical distributions of the Galactic disks, we investigate the vertical distribution of the Galactic disks as a function of radial action based on Apache Point Observatory
Externí odkaz:
http://arxiv.org/abs/2212.08519
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 greater than 75\% escape velocity that probably origin from Sagittarius dwar
Externí odkaz:
http://arxiv.org/abs/2206.13002
Based on the second Gaia data release (DR2) and APOGEE (DR16) spectroscopic surveys, wedefined two kinds of star sample: high-velocity thick disk (HVTD) with $v{\phi}>90km/s$ and metal-richstellar halo (MRSH) with $v{\phi}<90km/s$. Due to high resolu
Externí odkaz:
http://arxiv.org/abs/2105.03152
Autor:
Li, Hefan, Hammer, Francois, Babusiaux, Carine, Pawlowski, Marcel S., Yang, Yanbin, Arenou, Frederic, Du, Cuihua, Wang, Jianling
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 by combining both statistical and systematic errors, are smaller by a
Externí odkaz:
http://arxiv.org/abs/2104.03974
Autor:
Li, Hefan, Du, Cuihua, Yang, Yanbin, Newberg, Heidi Jo, Ma, Jun, Shi, Jianrong, Piao, Yunsong
Publikováno v:
ApJ, 895, 23 (2010)
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 kinematically and chemically, and determine their density distribution in e
Externí odkaz:
http://arxiv.org/abs/2010.14281