The age-kinematical features in the Milky Way outer disk

Abstract

We derive the mean velocity components at various Galactocentric radii from 8 to 14 kpc using about 40,000 red clump stars observed in the LAMOST survey. We find that the vertical bulk motion for younger red clump stars are significantly larger than that for the older red clump stars. This is likely the kinematical feature of the Galactic warp around its line-of-node, which is located close to the Galactic anti-center region. It is evident that the warp are mainly contributed by the younger stars rather than the older stars. The age variation in the vertical kinematics favors a formation scenario where the Galactic warp is originated from infalling misaligned gas.

arXiv comment4 pages, 2 figures, IAUS 321 "Formation and Evolution of Galaxy Outskirts"

References in corpus (9)

• The wobbly Galaxy: kinematics north and south with RAVE red clump giants
• Vertical density waves in the Milky Way disc induced by the Sagittarius Dwarf Galaxy
• The Vertical Structure of the Outer Milky Way HI Disk
• Misaligned Angular Momentum in Hydrodynamic Cosmological Simulations: Warps, Outer Discs, and Thick Discs
• Substructure in bulk velocities of Milky Way disk stars
• Galactic Warps Induced By Cosmic Infall
• Warped Galaxies From Misaligned Angular Momenta
• The site conditions of the Guo Shou Jing Telescope
• Red Clump Stars from the LAMOST data I: identification and distance

Cited by in corpus (4)

• The Galactic warp revealed by Gaia DR2 kinematics
• Evidence of a dynamically evolving Galactic warp
• Mapping the Galactic disk with the LAMOST and Gaia Red clump sample. VI: An evidence for the long lived non-steady warp of non-gravitational scenarios
• Warp and flare of the old Galactic disc as traced by the red clump stars