Huang, Y;
Schönrich, R;
Liu, XW;
Chen, BQ;
Zhang, HW;
Yuan, HB;
Xiang, MS;
... Tian, ZJ; + view all
(2018)
On the Kinematic Signature of the Galactic Warp As Revealed by the LAMOST-TGAS Data.
Astrophysical Journal
, 864
(2)
10.3847/1538-4357/aad285.
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Abstract
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 Vz as a function of absolute vertical angular momentum Lz and azimuthal velocity Vφ for guiding center radius Rg between 6.0 and 10.5 kpc. The trend is consistent with a largescale Galactic warp. Similar to Schonrich & Dehnen, we also find a wave-like pattern of Vz 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 Vz near Lz ∼ 2150 kpc km s-1 (corresponding to Rg ∼ 9 kpc and Vφ ∼ 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.
| Type: | Article |
|---|---|
| Title: | On the Kinematic Signature of the Galactic Warp As Revealed by the LAMOST-TGAS Data |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.3847/1538-4357/aad285 |
| Publisher version: | https://doi.org/10.3847/1538-4357/aad285 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Galaxy: kinematics and dynamics; Galaxy: structure; solar neighborhood; stars: distances; stars: kinematics and dynamics |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10083989 |
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