Gaia Data Release 2: Mapping the Milky Way disc kinematics

Context. The second Gaia data release (Gaia DR2) contains high-precision positions, parallaxes, and proper motions for 1.3 billion sources as well as line-of-sight velocities for 7.2 million stars brighter than GRVS=12 mag. Both samples provide a full sky coverage. Aims. To illustrate the potential...

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Published in:Astronomy and astrophysics (Berlin) 2018-08
Main Authors: Romero Gómez, Mercè, Figueras Siñol, Francesca, Jordi i Nebot, Carme, Luri Carrascoso, Xavier, Fabricius, Claus, Masana Fresno, Eduard, Portell i de Mora, Jordi, Clotet Altarriba, Marcial, Torra Roca, Jorge, Antiche Garzón, Balaguer Núñez, María de los Dolores, Borrachero, R, Cantat Gaudin, T, Carrasco Martínez, José Manuel, Casamiquela Floriach, Laia, Castro Ginard, A, Farràs Casas, M, Julbe, F, Mor Crespo, Roger, Torra Clotet, Ferran, Voss, H, Antoja Castelltort, M. Teresa, Gaia Collaboration
Format: Article
Language:English
Subjects:
Discs (Astrofísica)
Disks (Astrophysics)
Galaxies
Galàxies
Milky Way
Via Làctia
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Summary:Context. The second Gaia data release (Gaia DR2) contains high-precision positions, parallaxes, and proper motions for 1.3 billion sources as well as line-of-sight velocities for 7.2 million stars brighter than GRVS=12 mag. Both samples provide a full sky coverage. Aims. To illustrate the potential of Gaia DR2, we provide a first look at the kinematics of the Milky Way disc, within a radius of several kiloparsecs around the Sun. Methods. We benefit for the first time from a sample of 6.4 million F-G-K stars with full 6D phase-space coordinates, precise parallaxes and precise Galactic cylindrical velocities. From this sample, we extracted a sub-sample of 3.2 million giant stars to map the velocity field of the Galactic disc from ∼5 kpc to ∼13 kpc from the Galactic centre and up to 2 kpc above and below the plane. We also study the distribution of 0.3 millionsolar neighbourhood stars (r
ISSN:0004-6361