Results 31 to 40 of about 220,363 (170)
The Astrophysical JournalWe present a novel, deep-learning-based method—dubbed Galactic-Seismology Substructures and Streams Hunter, or GS ^3 Hunter for short—to search for substructures and streams in stellar kinematics data.
Guan-Yu Wang +6 more
doaj +1 more source
The Inside-out Growth of the Galactic Disk [PDF]
, 2019 We quantify the inside-out growth of the Milky Way's low-alpha stellar disk, modelling the ages, metallicities and Galactocentric radii of APOGEE red clump stars with 6 < R < 13 kpc. The current stellar distribution differs significantly from that expected from the star formation history due to the redistribution of stars through radial orbit mixing ...
arxiv +1 more source
Candidate Members of the VMP/EMP Disk System of the Galaxy from the SkyMapper and SAGES Surveys
The Astrophysical Journal Supplement SeriesPhotometric stellar surveys now cover a large fraction of the sky, probe to fainter magnitudes than large-scale spectroscopic surveys, and are relatively free from the target selection biases often associated with such studies.
Jihye Hong +17 more
doaj +1 more source
An Inward-moving and Asymmetric Velocity Wave Detected in LAMOST-Gaia
The Astrophysical Journal LettersThe phase space, as coded by kinematic parameters and chemical abundances, is crucial for understanding the formation of the Galactic disk. Using red giant stars from the Galactic thin disk with [Fe/H] > − 0.8 and low- α ratios identified in LAMOST-Gaia,
Yuqin Chen +5 more
doaj +1 more source
The Physical Thickness of Stellar Disks to z ~ 2 [PDF]
arXiv, 2023 In local disk galaxies such as our Milky Way, older stars generally inhabit a thicker disk than their younger counterparts. Two competing models have attempted to explain this result: one in which stars first form in thin disks that gradually thicken with time through dynamical heating, and one in which stars form in thick disks at early times and in ...
arxiv
Icarus Revisited: An Ancient, Metal-poor Accreted Stellar Stream in the Disk of the Milky Way
The Astrophysical JournalThe search for accreted satellites in the Galactic disk is a challenging task, to which Gaia plays a crucial role in synergy with ground-based spectroscopic surveys. In 2021, P. Re Fiorentin et al.
Paola Re Fiorentin +4 more
doaj +1 more source
The Stellar Disk Structure Revealed by the Mono-age Populations of the LAMOST Red Clump Star Sample
The Astronomical JournalUnderstanding the structure of the Galactic disk is crucial for understanding the formation and evolutionary history of the Milky Way. This study examines the structure of the Galactic disk by analyzing a sample of 138,667 primary red clump (RC) stars ...
Zheng Yu +4 more
doaj +1 more source
Value-added Catalog of M-giant Stars in LAMOST DR9
The Astrophysical Journal Supplement Series, 2023 In this work, we update the catalog of M-giant stars from the low-resolution spectra of the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Data Release 9.
Jing Li +11 more
doaj +1 more source
The Astrophysical JournalThe Milky Way (MW) is a barred spiral galaxy shaped by tidal interactions with its satellites. The Large Magellanic Cloud (LMC) and the Sagittarius dwarf galaxy (Sgr) are the dominant influences at the present day. This paper presents a suite of four 10 ^
Ioana A. Stelea +2 more
doaj +1 more source
Elemental abundance trends in the metal-rich thin and thick disks [PDF]
arXiv, 2006 Thick disks are common in spiral and S0 galaxies and seem to be an inherent part of galaxy formation and evolution. Our own Milky Way is host to an old thick disk. The stars associated with this disk are enhanced in the alpha-elements as compared to similar stars present in the thin disk.
arxiv