Poggio, E;
Drimmel, R;
Lattanzi, MG;
Smart, RL;
Spagna, A;
Andrae, R;
Bailer-Jones, CAL;
... Seabroke, G; + view all
(2019)
The kinematic signature of the Galactic warp with Gaia DR2.
In: Prusti, Timo, (ed.)
Proceedings of the 53rd ESLAB Symposium: the Gaia Universe.
Zenoldo Repository: Meyrin, Switzerland.
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Abstract
The second Gaia data release has published high-precision astrometric measurements for over a billion sources. In the coming years, Gaia data will make fundamental contributions to numerous open questions on the evolution of our Galaxy. We here focus on the long-standing debate on the origin and dynamical nature of the warp of our Galaxy, with particular attention to the warp-induced motions in stellar kinematics. Taking advantage of Gaia DR2 data, we detect the kinematic signature of the Galactic warp out to a distance of 7 kpc from the Sun. The signature manifests itself as a gradient of 5-6 km/s in the vertical velocities from 8 to 14 kpc in Galactic radius, with a signal-to-noise larger than 10. The signal is present in two samples of intrinsically young and old stellar populations, selected via a probabilistic approach. Based on our results, we argue that the warp is principally a gravitational phenomenon, thus placing an important constraint on the possible formation scenario. Finally, we observe that the old stellar populations present a smooth signal, as expected from a dynamically relaxed population, while the young sample exhibit a strongly perturbed kinematic pattern.
| Type: | Proceedings paper |
|---|---|
| Title: | The kinematic signature of the Galactic warp with Gaia DR2 |
| Event: | 53rd ESLAB Symposium: the Gaia Universe, 8-12 April 2019, Noordwijk, Netherlands |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.5281/zenodo.3236813 |
| Publisher version: | https://doi.org/10.5281/zenodo.3236813 |
| Language: | English |
| Additional information: | Creative Commons Attribution 4.0 International License. |
| 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/10079588 |
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