Gaia Data Release 2 Mapping the Milky Way disc kinematics

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Gaia Data Release 2 Mapping the Milky Way disc kinematics. / Gaia Collaboration.

In: Astronomy & Astrophysics, Vol. 616, 11, 10.08.2018.

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Gaia Collaboration 2018, 'Gaia Data Release 2 Mapping the Milky Way disc kinematics', Astronomy & Astrophysics, vol. 616, 11. https://doi.org/10.1051/0004-6361/201832865

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Gaia Collaboration. Gaia Data Release 2 Mapping the Milky Way disc kinematics. Astronomy & Astrophysics. 2018 Aug 10;616. 11. https://doi.org/10.1051/0004-6361/201832865

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Gaia Collaboration. / Gaia Data Release 2 Mapping the Milky Way disc kinematics. In: Astronomy & Astrophysics. 2018 ; Vol. 616.

Bibtex

@article{b5ddba95ad0b40048c3a348ef64e6a60,
title = "Gaia Data Release 2 Mapping the Milky Way disc kinematics",
abstract = "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 G(RVS) = 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 (sigma((omega) over bar)/(omega) over barResults. Gaia DR2 allows us to draw 3D maps of the Galactocentric median velocities and velocity dispersions with unprecedented accuracy, precision, and spatial resolution. The maps show the complexity and richness of the velocity field of the galactic disc. We observe streaming motions in all the components of the velocities as well as patterns in the velocity dispersions. For example, we confirm the previously reported negative and positive galactocentric radial velocity gradients in the inner and outer disc, respectively. Here, we see them as part of a non-axisymmetric kinematic oscillation, and we map its azimuthal and vertical behaviour. We also witness a new global arrangement of stars in the velocity plane of the solar neighbourhood and in distant regions in which stars are organised in thin substructures with the shape of circular arches that are oriented approximately along the horizontal direction in the U - V plane. Moreover, in distant regions, we see variations in the velocity substructures more clearly than ever before, in particular, variations in the velocity of the Hercules stream.Conclusions. Gaia DR2 provides the largest existing full 6D phase-space coordinates catalogue. It also vastly increases the number of available distances and transverse velocities with respect to Gaia DR1. Gaia DR2 offers a great wealth of information on the Milky Way and reveals clear non-axisymmetric kinematic signatures within the Galactic disc, for instance. It is now up to the astronomical community to explore its full potential.",
keywords = "Galaxy: kinematics and dynamics, Galaxy: disk, solar neighborhood, STELLAR VELOCITY DISTRIBUTION, GENEVA-COPENHAGEN SURVEY, GALACTIC EVOLUTION EXPERIMENT, SAGITTARIUS DWARF GALAXY, PHASE-SPACE STRUCTURE, RED-CLUMP GIANTS, SOLAR NEIGHBORHOOD, MINOR MERGERS, SPIRAL ARMS, MAGELLANIC STREAM",
author = "D. Katz and T. Antoja and M. Romero-Gomez and R. Drimmel and C. Reyle and Seabroke, {G. M.} and C. Soubiran and C. Babusiaux and {Di Matteo}, P. and F. Figueras and E. Poggio and Robin, {A. C.} and Evans, {D. W.} and Brown, {A. G. A.} and A. Vallenari and T. Prusti and {de Bruijne}, {J. H. J.} and Bailer-Jones, {C. A. L.} and M. Biermann and L. Eyer and F. Jansen and C. Jordi and Klioner, {S. A.} and U. Lammers and L. Lindegren and X. Luri and F. Mignard and C. Panem and D. Pourbaix and S. Randich and P. Sartoretti and Siddiqui, {H. I.} and {van Leeuwen}, F. and Walton, {N. A.} and F. Arenou and U. Bastian and M. Cropper and Lattanzi, {M. G.} and J. Bakker and C. Cacciari and J. Castaneda and L. Chaoul and N. Cheek and {De Angeli}, F. and C. Fabricius and R. Guerra and B. Holl and E. Masana and M. Smith and {von Essen}, C. and {Gaia Collaboration}",
year = "2018",
month = "8",
day = "10",
doi = "10.1051/0004-6361/201832865",
language = "English",
volume = "616",
journal = "Astronomy & Astrophysics",
issn = "0004-6361",
publisher = "E D P Sciences",

}

RIS

TY - JOUR

T1 - Gaia Data Release 2 Mapping the Milky Way disc kinematics

AU - Katz, D.

AU - Antoja, T.

AU - Romero-Gomez, M.

AU - Drimmel, R.

AU - Reyle, C.

AU - Seabroke, G. M.

AU - Soubiran, C.

AU - Babusiaux, C.

AU - Di Matteo, P.

AU - Figueras, F.

AU - Poggio, E.

AU - Robin, A. C.

AU - Evans, D. W.

AU - Brown, A. G. A.

AU - Vallenari, A.

AU - Prusti, T.

AU - de Bruijne, J. H. J.

AU - Bailer-Jones, C. A. L.

AU - Biermann, M.

AU - Eyer, L.

AU - Jansen, F.

AU - Jordi, C.

AU - Klioner, S. A.

AU - Lammers, U.

AU - Lindegren, L.

AU - Luri, X.

AU - Mignard, F.

AU - Panem, C.

AU - Pourbaix, D.

AU - Randich, S.

AU - Sartoretti, P.

AU - Siddiqui, H. I.

AU - van Leeuwen, F.

AU - Walton, N. A.

AU - Arenou, F.

AU - Bastian, U.

AU - Cropper, M.

AU - Lattanzi, M. G.

AU - Bakker, J.

AU - Cacciari, C.

AU - Castaneda, J.

AU - Chaoul, L.

AU - Cheek, N.

AU - De Angeli, F.

AU - Fabricius, C.

AU - Guerra, R.

AU - Holl, B.

AU - Masana, E.

AU - Smith, M.

AU - von Essen, C.

AU - Gaia Collaboration

PY - 2018/8/10

Y1 - 2018/8/10

N2 - 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 G(RVS) = 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 (sigma((omega) over bar)/(omega) over barResults. Gaia DR2 allows us to draw 3D maps of the Galactocentric median velocities and velocity dispersions with unprecedented accuracy, precision, and spatial resolution. The maps show the complexity and richness of the velocity field of the galactic disc. We observe streaming motions in all the components of the velocities as well as patterns in the velocity dispersions. For example, we confirm the previously reported negative and positive galactocentric radial velocity gradients in the inner and outer disc, respectively. Here, we see them as part of a non-axisymmetric kinematic oscillation, and we map its azimuthal and vertical behaviour. We also witness a new global arrangement of stars in the velocity plane of the solar neighbourhood and in distant regions in which stars are organised in thin substructures with the shape of circular arches that are oriented approximately along the horizontal direction in the U - V plane. Moreover, in distant regions, we see variations in the velocity substructures more clearly than ever before, in particular, variations in the velocity of the Hercules stream.Conclusions. Gaia DR2 provides the largest existing full 6D phase-space coordinates catalogue. It also vastly increases the number of available distances and transverse velocities with respect to Gaia DR1. Gaia DR2 offers a great wealth of information on the Milky Way and reveals clear non-axisymmetric kinematic signatures within the Galactic disc, for instance. It is now up to the astronomical community to explore its full potential.

AB - 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 G(RVS) = 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 (sigma((omega) over bar)/(omega) over barResults. Gaia DR2 allows us to draw 3D maps of the Galactocentric median velocities and velocity dispersions with unprecedented accuracy, precision, and spatial resolution. The maps show the complexity and richness of the velocity field of the galactic disc. We observe streaming motions in all the components of the velocities as well as patterns in the velocity dispersions. For example, we confirm the previously reported negative and positive galactocentric radial velocity gradients in the inner and outer disc, respectively. Here, we see them as part of a non-axisymmetric kinematic oscillation, and we map its azimuthal and vertical behaviour. We also witness a new global arrangement of stars in the velocity plane of the solar neighbourhood and in distant regions in which stars are organised in thin substructures with the shape of circular arches that are oriented approximately along the horizontal direction in the U - V plane. Moreover, in distant regions, we see variations in the velocity substructures more clearly than ever before, in particular, variations in the velocity of the Hercules stream.Conclusions. Gaia DR2 provides the largest existing full 6D phase-space coordinates catalogue. It also vastly increases the number of available distances and transverse velocities with respect to Gaia DR1. Gaia DR2 offers a great wealth of information on the Milky Way and reveals clear non-axisymmetric kinematic signatures within the Galactic disc, for instance. It is now up to the astronomical community to explore its full potential.

KW - Galaxy: kinematics and dynamics

KW - Galaxy: disk

KW - solar neighborhood

KW - STELLAR VELOCITY DISTRIBUTION

KW - GENEVA-COPENHAGEN SURVEY

KW - GALACTIC EVOLUTION EXPERIMENT

KW - SAGITTARIUS DWARF GALAXY

KW - PHASE-SPACE STRUCTURE

KW - RED-CLUMP GIANTS

KW - SOLAR NEIGHBORHOOD

KW - MINOR MERGERS

KW - SPIRAL ARMS

KW - MAGELLANIC STREAM

U2 - 10.1051/0004-6361/201832865

DO - 10.1051/0004-6361/201832865

M3 - Journal article

VL - 616

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

SN - 0004-6361

M1 - 11

ER -