Poggio, E;
Drimmel, R;
Lattanzi, MG;
Smart, RL;
Spagna, A;
Andrae, R;
Bailer-Jones, CAL;
... Seabroke, GM; + view all
(2018)
The Galactic warp revealed by Gaia DR2 kinematics.
Monthly Notices of the Royal Astronomical Society: Letters
, 481
(1)
L21-L25.
10.1093/mnrasl/sly148.
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Abstract
Using Gaia DR2 astrometry, we map the kinematic signature of the Galactic stellar warp out to a distance of 7 kpc from the Sun. Combining Gaia DR2 and 2-Micron All Sky Survey photometry, we identify, via a probabilistic approach, 599 494 upper main sequence (UMS) stars and 12 616 068 giants without the need for individual extinction estimates. The spatial distribution of the UMS stars clearly shows segments of the nearest spiral arms. The large-scale kinematics of both the UMS and giant populations show a clear signature of the warp of the Milky Way, apparent as a gradient of 5–6 km s⁻¹ in the vertical velocities from 8 to 14 kpc in Galactic radius. The presence of the signal in both samples, which have different typical ages, suggests that the warp is a gravitationally induced phenomenon.
| Type: | Article |
|---|---|
| Title: | The Galactic warp revealed by Gaia DR2 kinematics |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnrasl/sly148 |
| Publisher version: | https://doi.org/10.1093/mnrasl/sly148 |
| 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: | stars: kinematics and dynamics, Galaxy: disc, Galaxy: kinematics and dynamics, Galaxy: structure |
| 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-pp.ucl.ac.uk/id/eprint/10058599 |
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