SIMBAD references

2018ApJ...864..129H - Astrophys. J., 864, 129-129 (2018/September-2)

On the kinematic signature of the Galactic warp as revealed by the LAMOST-TGAS data.

HUANG Y., SCHONRICH R., LIU X.-W., CHEN B.-Q., ZHANG H.-W., YUAN H.-B., XIANG M.-S., WANG C. and TIAN Z.-J.

Abstract (from CDS):

Using a sample of about 123,000 stars with accurate 3D velocity measurements from the LAMOST-TGAS data, we confirm the kinematic signature of the Galactic warp recently found by Schonrich & Dehnen. The data reveal a clear trend of increasing mean vertical velocity  as a function of absolute vertical angular momentum Lz and azimuthal velocity Vph for guiding center radius Rg between 6.0 and 10.5 kpc. The trend is consistent with a large-scale Galactic warp. Similar to Schonrich & Dehnen, we also find a wave-like pattern of  versus Lz with an amplitude of ∼0.9 km s–1 on a scale of ∼2.0 kpc, which could arise from bending waves or a winding warp. Finally, we confirm a prominent, localized peak in  near Lz ∼ 2150 kpc km s–1 (corresponding to Rg ∼ 9 kpc and Vph ∼ 255 km s–1). The additional line-of-sight velocity information from LAMOST reveals that stars in this feature have a large, inward radial velocity of VR ∼ -13.33 ± 0.59 km s–1 and a small radial velocity dispersion of σR ∼ 25.27 ± 0.89 km s–1, suggesting that a stellar stream gives rise to this feature.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): Galaxy: kinematics and dynamics - Galaxy: structure - solar neighborhood - stars: distances - stars: kinematics and dynamics

Simbad objects: 6

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2019.12.12-12:43:02

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