%0 Journal Article
%T Gaia Data Release 2. Mapping the Milky Way disc kinematics
%+ Galaxies, Etoiles, Physique, Instrumentation (GEPI)
%+ Laboratoire d'Astrophysique de Marseille (LAM)
%+ Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM)
%+ Laboratoire d'Astrophysique de Bordeaux [Pessac] (LAB)
%+ Institut de Planétologie et d'Astrophysique de Grenoble (IPAG)
%+ Agence Spatiale Européenne = European Space Agency (ESA)
%+ Geneva Observatory
%+ Institut de Ciencies del Cosmos (ICCUB)
%+ Institut de Ciènces del Cosmos (ICC)
%+ Joseph Louis LAGRANGE (LAGRANGE)
%+ Centre National d'Études Spatiales [Toulouse] (CNES)
%+ Université libre de Bruxelles (ULB)
%+ Zentrum für astronomie
%+ International Center for Relativistic Astrophysics (ICRA)
%+ Institute of Astronomy [Cambridge]
%+ University of Las Palmas de Gran Canaria (ULPGC)
%+ Departament de Geodinamica i Geofısica, Facultat de Geologia,
%+ European Space Astronomy Centre (ESAC)
%+ Systèmes de Référence Temps Espace (SYRTE)
%+ Université de Genève = University of Geneva (UNIGE)
%+ Department of Physics and Astronomy [UCL London]
%+ Commissariat à l'énergie atomique et aux énergies alternatives (CEA)
%+ Royal Observatory of Belgium = Observatoire Royal de Belgique  (ROB)
%+ Institut de Mécanique Céleste et de Calcul des Ephémérides (IMCCE)
%+ INAF - Osservatorio Astrofisico di Torino (OATo)
%+ Alma Mater Studiorum Università di Bologna = University of Bologna (UNIBO)
%+ Open University of Israël
%+ Instituut voor Sterrenkunde [Leuven]
%+ Laboratoire d'astrophysique de l'observatoire de Besançon (UMR 6091) (LAOB)
%+ Institut de Mécanique Céleste et de Calcul des Ephémérides (IMCCE)
%+ Laboratoire Univers et Particules de Montpellier (LUPM)
%+ Department of Astronomy and Space Physics [Uppsala]
%+ SIM/IDL Faculdade de Ciências da Universidade de Lisboa (FCUL)
%+ Universidad de Granada = University of Granada (UGR)
%+ Helsinki Institute of Physics (HIP)
%+ INAF - Osservatorio Astronomico di Bologna (OABO)
%+ Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA)
%+ United States Geological Survey [Reston] (USGS)
%+ National Institute for Subatomic Physics [Amsterdam] (NIKHEF)
%+ Department of Medicine
%+ Universitat de Barcelona (UB)
%+ Department of Physics and Astronomy [Uppsala]
%+ Centro de Astrobiologia [Madrid] (CAB)
%+ Department of Physics and Astronomy [Leicester]
%+ Observatoire astronomique de Strasbourg (OAS)
%+ INAF - Osservatorio Astronomico di Roma (OAR)
%+ Institute of Astronomy [Leuven]
%+ Università degli Studi di Roma "La Sapienza" = Sapienza University [Rome] (UNIROMA)
%+ Astrometry
%+ Universidade de Lisboa = University of Lisbon (ULISBOA)
%+ Department of Physics [Athens]
%+ Uppsala University
%+ Laboratoire national de métrologie et d'essais - Systèmes de Référence Temps-Espace (LNE - SYRTE)
%+ Institut de Physique de Rennes (IPR)
%+ INAF - Osservatorio Astronomico di Capodimonte (OAC)
%+ Laboratoire d'Ingienerie des Polymères pour les Hautes Technologies (LIPHT)
%+ TKK Helsinki University of Technology (TKK)
%+ School of Physics and Astronomy [Tel Aviv] (TAU)
%+ Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO)
%+ INAF - Osservatorio Astrofisico di Catania (OACT)
%+ Inst. Ciencia Molecular
%+ Astronomical Observatory [Poznan]
%+ Observatoire Astronomique de l'Université de Genève (ObsGE)
%+ Spanish Virtual Observatory - Observatorio Virtual Español (SVO)
%+ Institut d'Astrophysique et de Géophysique [Liège]
%+ Konkoly Observatory
%+ Instituto de Astronomia, Geofísica e Ciências Atmosféricas [São Paulo] (IAG)
%+ Department of Astrophysics [Nijmegen]
%+ Institut d'Astrophysique de Paris (IAP)
%+ Lohrmann Observatory
%A Collaboration, Gaia
%A Katz, D.
%A Antoja, T.
%A Romero-Gomez, M.
%A Drimmel, R.
%A Reylé, C.
%A Seabroke, M.
%A Soubiran, C.
%A Babusiaux, C.
%A Di Matteo, P.
%A Figueras, F.
%A Poggio, E.
%A Robin, A. C.
%A Evans, D.
%A Brown, A.G.A.
%A Vallenari, A.
%A Prusti, T.
%A de Bruijne, J.
%A Bailer-Jones, C.
%A Biermann, M.
%A Eyer, L.
%A Jansen, F.
%A Jordi, C.
%A Klioner, A.
%A Lammers, U.
%A Lindegren, L.
%A Luri, X.
%A Mignard, F.
%A Panem, C.
%A Pourbaix, D.
%A Randich, S.
%A Sartoretti, P.
%A Siddiqui, H.
%A van Leeuwen, F.
%A Walton, A.
%A Arenou, F.
%A Bastian, U.
%A Cropper, M.
%A Lattanzi, M.
%A Bakker, J.
%A Cacciari, C.
%A Casta N, J.
%A Chaoul, L.
%A Cheek, N.
%A de Angeli, F.
%A Fabricius, C.
%A Guerra, R.
%A Holl, B.
%A Masana, E.
%A Messineo, R.
%A Mowlavi, N.
%A Nienartowicz, K.
%A Panuzzo, P.
%A Portell, J.
%A Riello, M.
%A Tanga, P.
%A Thévenin, F.
%A Gracia-Abril, G.
%A Comoretto, G.
%A Garcia-Reinaldos, M.
%A Teyssier, D.
%A Altmann, M.
%A Andrae, R.
%A Audard, M.
%A Bellas-Velidis, I.
%A Benson, K.
%A Berthier, J.
%A Blomme, R.
%A Burgess, P.
%A Busso, G.
%A Carry, B.
%A Cellino, A.
%A Clementini, G.
%A Clotet, M.
%A Creevey, O.
%A Davidson, M.
%A de Ridder, J.
%A Delchambre, L.
%A Dell’oro, A.
%A Ducourant, C.
%A Fernández-Hernández, J.
%A Fouesneau, M.
%A Fremat, Y.
%A Galluccio, L.
%A García-Torres, M.
%A González-Núñez, J.
%A González-Vidal, J.
%A Gosset, E.
%A Guy, P.
%A Halbwachs, J.
%A Hambly, C.
%A Harrison, D.
%A Hernandez, J.
%A Hestroffer, D.
%A Hodgkin, T.
%A Hutton, A.
%A Jasniewicz, Gérard
%A Jean-Antoine-Piccolo, A.
%A Jordan, S.
%A Korn, A.
%A Krone-Martins, A.
%A Lanzafame, C.
%A Lebzelter, T.
%A Löffler, W.
%A Manteiga, M.
%A Marrese, M.
%A Martín-Fleitas, M.
%A Moitinho, A.
%A Mora, A.
%A Muinonen, K.
%A Osinde, J.
%A Pancino, E.
%A Pauwels, T.
%A Petit, J.M.
%A Recio-Blanco, A.
%A Richards, P.
%A Rimoldini, L.
%A Sarro, M.
%A Siopis, C.
%A Smith, M.
%A Sozzetti, A.
%A Süveges, M.
%A Torra, J.
%A van Reeven, W.
%A Abbas, U.
%A Abreu Aramburu, A.
%A Accart, S.
%A Aerts, C.
%A Altavilla, G.
%A Alvarez, M.
%A Alvarez, R.
%A Alves, J.
%A Anderson, R.
%A Andrei, A.
%A Anglada Varela, E.
%A Antiche, E.
%A Arcay, B.
%A Astraatmadja, T.
%A Bach, N.
%A Baker, G.
%A Balaguer-Nunez, L.
%A Balm, P.
%A Barache, C.
%A Barata, C.
%A Barbato, D.
%A Barblan, F.
%A Barklem, P.
%A Barrado, D.
%A Barros, M.
%A Barstow, M.
%A Bartholomé Muñoz, L.
%A Bassilana, J.
%A Becciani, U.
%A Bellazzini, M.
%A Berihuete, A.
%A Bertone, Stefano
%A Bianchi, L.
%A Bienaymé, O.
%A Blanco-Cuaresma, S.
%A Boch, T.
%A Boeche, C.
%A Bombrun, A.
%A Borrachero, R.
%A Bossini, D.
%A Bouquillon, S.
%A Bourda, G.
%A Bragaglia, A.
%A Bramante, L.
%A Breddels, M.
%A Bressan, A.
%A Brouillet, N.
%A Brüsemeister, T.
%A Brugaletta, E.
%A Bucciarelli, B.
%A Burlacu, A.
%A Busonero, D.
%A Butkevich, G.
%A Buzzi, R.
%A Caffau, E.
%A Cancelliere, R.
%A Cannizzaro, G.
%A Cantat-Gaudin, T.
%A Carballo, R.
%A Carlucci, T.
%A Carrasco, M.
%A Casamiquela, L.
%A Castellani, M.
%A Castro-Ginard, A.
%A Charlot, P.
%A Chemin, L.
%A Chiavassa, A.
%A Cocozza, G.
%A Costigan, G.
%A Cowell, S.
%A Crifo, F.
%A Crosta, M.
%A Crowley, C.
%A Cuypers†, J.
%A Dafonte, C.
%A Damerdji, Y.
%A Dapergolas, A.
%A David, P.
%A David, M.
%A de Laverny, P.
%A de Luise, F.
%A de March, R.
%A de Souza, R.
%A de Torres, A.
%A Debosscher, J.
%A del Pozo, E.
%A Delbò, M.
%A Delgado, A.
%A Delgado, E.
%A Diakité, S.
%A Diener, C.
%A Distefano, E.
%A Dolding, C.
%A Drazinos, P.
%A Duran, J.
%A Edvardsson, B.
%A Enke, H.
%A Eriksson, K.
%A Esquej, P.
%A Eynard Bontemps, G.
%A Fabre, C.
%A Fabrizio, M.
%A Faigler, S.
%A Falc A, A.
%A Farràs Casas, M.
%A Federici, L.
%A Fedorets, G.
%A Fernique, P.
%A Filippi, F.
%A Findeisen, K.
%A Fonti, A.
%A Fraile, E.
%A Fraser, M.
%A Frézouls, B.
%A Gai, M.
%A Galleti, S.
%A Garabato, D.
%A García-Sedano, F.
%A Garofalo, A.
%A Garralda, N.
%A Gavel, A.
%A Gavras, P.
%A Gerssen, J.
%A Geyer, R.
%A Giacobbe, P.
%A Gilmore, G.
%A Girona, S.
%A Giuffrida, G.
%A Glass, F.
%A Gomes, M.
%A Granvik, M.
%A Gueguen, A.
%A Guerrier, A.
%A Guiraud, J.
%A Gutié, R.
%A Haigron, R.
%A Hatzidimitriou, D.
%A Hauser, M.
%A Haywood, M.
%A Heiter, U.
%A Helmi, A.
%A Heu, J.
%A Hilger, T.
%A Hobbs, D.
%A Hofmann, W.
%A Holl, G.
%A Huckle, E.
%A Hypki, A.
%A Icardi, V.
%A Janssen, K.
%A Jevardat de Fombelle, G.
%A Jonker, G.
%A Juhasz, L.
%A Julbe, F.
%A Karampelas, A.
%A Kewley, A.
%A Klar, J.
%A Kochoska, A.
%A Kohley, R.
%A Kolenberg, K.
%A Kontizas, M.
%A Kontizas, E.
%A Koposov, E.
%A Kordopatis, G.
%A Kostrzewa-Rutkowska, Z.
%A Koubsky, P.
%A Lambert, S.
%A Lanza, F.
%A Lasne, Y.
%A Lavigne, J.
%A Le Fustec, Y.
%A Le Poncin-Lafitte, C.
%A Lebreton, Y.
%A Leccia, S.
%A Leclerc, N.
%A Lecoeur-Taibi, I.
%A Lenhardt, H.
%A Leroux, F.
%A Liao, S.
%A Licata, E.
%A Lindstrøm, P.
%A Lister, T.
%A Livanou, E.
%A Lobel, A.
%A Lopez, M.
%A Managau, S.
%A Mann, R.
%A Mantelet, G.
%A Marchal, O.
%A Marchant, M.
%A Marconi, M.
%A Marinoni, S.
%A Marschalkó, G.
%A Marshall, D.
%A Martino, M.
%A Marton, G.
%A Mary, N.
%A Massari, D.
%A Matijevič, G.
%A Mazeh, T.
%A Mcmillan, P.
%A Messina, S.
%A Michalik, D.
%A Millar, R.
%A Molina, R.
%A Molina, D.
%A Molnar, L.
%A Montegriffo, P.
%A Mor, R.
%A Mor, T.
%A Mor, D.
%A Mulone, F.
%A Muraveva, T.
%A Musella, I.
%A Nelemans, G.
%A Nicastro, L.
%A Noval, L.
%A O’mullane, W.
%A Ordenovic, C.
%A Ordóñez-Blanco, D.
%A Osborne, P.
%A Pagani, C.
%A Pagano, I.
%A Pailler, F.
%A Palacin, H.
%A Palaversa, L.
%A Panahi, A.
%A Pawlak, M.
%A Piersimoni, M.
%A Pineau, F.
%A Plachy, E.
%A Plum, G.
%A Poujoulet, E.
%A Prša, A.
%A Pulone, L.
%A Racero, E.
%A Ragaini, S.
%A Rambaux, N.
%A Ramos-Lerate, M.
%A Regibo, S.
%A Riclet, F.
%A Ripepi, V.
%A Riva, A.
%A Rixon, G.
%A Roegiers, T.
%A Roelens, M.
%A Rowell, N.
%A Royer, F.
%A Ruiz-Dern, L.
%A Sadowski, G.
%A Sagristà Sellés, T.
%A Sahlmann, J.
%A Salgado, J.
%A Salguero, E.
%A Sanna, N.
%A Santana-Ros, T.
%A Sarasso, M.
%A Savietto, H.
%A Schultheis, M.
%A Sciacca, E.
%A Segol, M.
%A Segovia, C.
%A Segransan, D.
%A Shih, C.
%A Siltala, L.
%A Silva, F.
%A Smart, R.
%A Smith, K.
%A Solano, E.
%A Solitro, F.
%A Sordo, R.
%A Soria Nieto, S.
%A Souchay, J.
%A Spagna, A.
%A Spoto, F.
%A Stampa, U.
%A Steele, A.
%A Steidelmüller, H.
%A Stephenson, C.
%A Stoev, H.
%A Suess, F.
%A Surdej, J.
%A Szabados, L.
%A Szegedi-Elek, E.
%A Tapiador, D.
%A Taris, F.
%A Tauran, G.
%A Taylor, M.
%A Teixeira, R.
%A Terrett, D.
%A Teyssandier, P.
%A Thuillot, W.
%A Titarenko, A.
%A Clotet, F.
%A Turon, C.
%A Ulla, A.
%A Utrilla, E.
%A Uzzi, S.
%A Vaillant, M.
%A Valentini, G.
%A Valette, V.
%A van Elteren, A.
%A van Hemelryck, E.
%A van Leeuwen, M.
%A Vaschetto, M.
%A Vecchiato, A.
%A Veljanoski, J.
%A Viala, Y.
%A Vicente, D.
%A Vogt, S.
%A von Essen, C.
%A Voss, H.
%A Votruba, V.
%A Voutsinas, S.
%A Walmsley, G.
%A Weiler, M.
%A Wertz, O.
%A Wevers, T.
%A Wyrzykowski, Ł.
%A Yoldas, A.
%A Žerjal, M.
%A Ziaeepour, H.
%A Zorec, J.
%A Zschocke, S.
%A Zucker, S.
%A Zurbach, C.
%A Zwitter, T.
%< avec comité de lecture
%@ 0004-6361
%J Astronomy and Astrophysics - A&A
%I EDP Sciences
%V 616
%P A11
%8 2018-08
%D 2018
%Z 1804.09380
%Z 2018A&A...616A..11G
%R 10.1051/0004-6361/201832865
%K Galaxy: kinematics and dynamics - Galaxy: disk - solar neighborhood
%Z Physics [physics]/Astrophysics [astro-ph]
%Z Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM]Journal articles
%X 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 par- allaxes (σπ/π ≤ 20%), and precise Galactic cylindrical velocities (median uncertainties of 0.9-1.4 kms−1 and 20% of the stars with uncertainties smaller than 1 km s−1 on all three components). 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 million solar neighbourhood stars (r < 200 pc), with median velocity uncertainties of 0.4 km s−1 , in velocity space and use the full sample to examine how the over-densities evolve in more distant regions.Results. 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.
%G English
%2 https://hal.science/hal-02023530/document
%2 https://hal.science/hal-02023530/file/aa32865-18.pdf
%L hal-02023530
%U https://hal.science/hal-02023530
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