Poggio, E; Drimmel, R; Lattanzi, MG; Smart, RL; Spagna, A; Andrae, R; Bailer-Jones, CAL; ... Seabroke, G; + view all Poggio, E; Drimmel, R; Lattanzi, MG; Smart, RL; Spagna, A; Andrae, R; Bailer-Jones, CAL; Fouesneau, M; Antoja, T; Babusiaux, C; Evans, DW; Figueras, F; Katz, D; Reylé, C; Robin, AC; Romero-Gómez, M; Seabroke, G; - view fewer (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.

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