posted on 2019-09-24, 16:00authored byA Helmi, F van Leeuwen, PJ McMillan, D Massari, T Antoja, AC Robin, L Lindegren, U Bastian, F Arenou, C Babusiaux, M Biermann, MA Breddels, D Hobbs, C Jordi, E Pancino, C Reyle, J Veljanoski, AGA Brown, A Vallenari, T Prusti, JHJ de Bruijne, CAL Bailer-Jones, DW Evans, L Eyer, F Jansen, SA Klioner, U Lammers, X Luri, F Mignard, C Panem, D Pourbaix, S Randich, P Sartoretti, HI Siddiqui, C Soubiran, NA Walton, M Cropper, R Drimmel, D Katz, MG Lattanzi, J Bakker, C Cacciari, J Castaneda, L Chaoul, N Cheek, F De Angeli, C Fabricius, R Guerra, B Holl, E Masana, R Messineo, N Mowlavi, K Nienartowicz, P Panuzzo, J Portell, M Riello, GM Seabroke, P Tanga, F Thevenin, G Gracia-Abril, G Comoretto, M Garcia-Reinaldos, D Teyssier, M Altmann, R Andrae, M Audard, I Bellas-Velidis, K Benson, J Berthier, R Blomme, P Burgess, G Busso, B Carry, A Cellino, G Clementini, M Clotet, O Creevey, M Davidson, J De Ridder, L Delchambre, A Dell'Oro, C Ducourant, J Fernandez-Hernandez, M Fouesneau, Y Fremat, L Galluccio, M Garcia-Torres, J Gonzalez-Nunez, JJ Gonzalez-Vidal, E Gosset, LP Guy, J-L Halbwachs, NC Hambly, DL Harrison, J Hernandez, D Hestroffer, ST Hodgkin, A Hutton, G Jasniewicz, A Jean-Antoine-Piccolo, S Jordan, AJ Korn, A Krone-Martins, AC Lanzafame, T Lebzelter, W Loeffler, M Manteiga, PM Marrese, JM Martin-Fleitas, A Moitinho, A Mora, K Muinonen, J Osinde, T Pauwels, J-M Petit, A Recio-Blanco, PJ Richards, L Rimoldini, LM Sarro, C Siopis, M Smith, A Sozzetti, M Sueveges, J Torra, W van Reeven, U Abbas, A Abreu Aramburu, S Accart, C Aerts, G Altavilla, MA Alvarez, R Alvarez, J Alves, RI Anderson, AH Andrei, E Anglada Varela, E Antiche, B Arcay, TL Astraatmadja, N Bach, SG Baker, L Balaguer-Nunez, P Balm, C Barache, C Barata, D Barbato, F Barblan, PS Barklem, D Barrado, M Barros, MA Barstow, S Bartholome Munoz, J-L Bassilana, U Becciani, M Bellazzini, A Berihuete, S Bertone, L Bianchi, O Bienayme, S Blanco-Cuaresma, T Boch, C Boeche, A Bombrun, R Borrachero, D Bossini, S Bouquillon, G Bourda, A Bragaglia, L Bramante, A Bressan, N Brouillet, T Bruesemeister, E Brugaletta, B Bucciarelli, A Burlacu, D Busonero, AG Butkevich, R Buzzi, E Caffau, R Cancelliere, G Cannizzaro, T Cantat-Gaudin, R Carballo, T Carlucci, JM Carrasco, L Casamiquela, M Castellani, A Castro-Ginard, P Charlot, L Chemin, A Chiavassa, G Cocozza, G Costigan, S Cowell, F Crifo, M Crosta, C Crowley, J Cuypers, C Dafonte, Y Damerdji, A Dapergolas, P David, M David, P de Laverny, F De Luise, R De March, D de Martino, R de Souza, A de Torres, J Debosscher, E del Pozo, M Delbo, A Delgado, HE Delgado, P Di Matteo, S Diakite, C Diener, E Distefano, C Dolding, P Drazinos, J Duran, B Edvardsson, H Enke, K Eriksson, P Esquej, GE Bontemps, C Fabre, M Fabrizio, S Faigler, AJ Falcao, M Farras Casas, L Federici, G Fedorets, P Fernique, F Figueras, F Filippi, K Findeisen, A Fonti, E Fraile, M Fraser, B Frezouls, M Gai, S Galleti, D Garabato, F Garcia-Sedano, A Garofalo, N Garralda, A Gavel, P Gavras, J Gerssen, R Geyer, P Giacobbe, G Gilmore, S Girona, G Giuffrida, F Glass, M Gomes, M Granvik, A Gueguen, A Guerrier, J Guiraud, R Gutierrez-Sanchez, W Hofmann, G Holland, HE Huckle, A Hypki, V Icardi, K Janssen, GJ de Fombelle, PG Jonker, AL Juhasz, F Julbe, A Karampelas, A Kewley, J Klar, A Kochoska, R Kohley, K Kolenberg, M Kontizas, E Kontizas, SE Koposov, G Kordopatis, Z Kostrzewa-Rutkowska, P Koubsky, S Lambert, AF Lanza, Y Lasne, J-B Lavigne, Y Le Fustec, C Le Poncin-Lafitte, Y Lebreton, S Leccia, N Leclerc, I Lecoeur-Taibi, H Lenhardt, F Leroux, S Liao, E Licata, HEP Lindstrom, TA Lister, E Livanou, A Lobel, M Lopez, S Managau, RG Mann, G Mantelet, O Marchal, JM Marchant, M Marconi, S Marinoni, G Marschalko, DJ Marshall, M Martino, G Marton, N Mary, G Matijevic, T Mazeh, S Messina, D Michalik, NR Millar, D Molina, R Molinaro, L Molnar, P Montegriffo, R Mor, R Morbidelli, T Morel, D Morris, AF Mulone, T Muraveva, I Musella, G Nelemans, L Nicastro, L Noval, W O'Mullane, C Ordenovic, D Ordonez-Blanco, P Osborne, C Pagani, I Pagano, F Pailler, H Palacin, L Palaversa, A Panahi, M Pawlak, AM Piersimoni, F-X Pineau, E Plachy, G Plum, E Poggio, E Poujoulet, A Prsa, L Pulone, E Racero, S Ragaini, N Rambaux, M Ramos-Lerate, S Regibo, F Riclet, V Ripepi, A Riva, A Rivard, G Rixon, T Roegiers, M Roelens, M Romero-Gomez, N Rowell, F Royer, L Ruiz-Dern, G Sadowski, TS Selles, J Sahlmann, J Salgado, E Salguero, N Sanna, T Santana-Ros, M Sarasso, H Savietto, M Schultheis, E Sciacca, M Segol, JC Segovia, D Segransan, I-C Shih, L Siltala, AF Silva, RL Smart, KW Smith, E Solano, F Solitro, R Sordo, S Soria Nieto, J Souchay, A Spagna, F Spoto, U Stampa, IA Steele, H Steidelmueller, CA Stephenson, H Stoev, FF Suess, J Surdej, L Szabados, E Szegedi-Elek, D Tapiador, F Taris, G Tauran, MB Taylor, R Teixeira, D Terrett, P Teyssandier, W Thuillot, A Titarenko, F Torra Clotet, C Turon, A Ulla, E Utrilla, S Uzzi, M Vaillant, G Valentini, V Valette, A van Elteren, E Van Hemelryck, M van Leeuwen, M Vaschetto, A Vecchiato, Y Viala, D Vicente, S Vogt, C von Essen, H Voss, V Votruba, S Voutsinas, G Walmsley, M Weiler, O Wertz, T Wevems, L Wyrzykowski, A Yoldas, M Zerjal, H Ziaeepour, J Zorec, S Zschocke, S Zucker, C Zurbach, T Zwitter
Context.
Aims. The goal of this paper is to demonstrate the outstanding quality of the second data release of the Gaia mission and its power for constraining many different aspects of the dynamics of the satellites of the Milky Way. We focus here on determining the proper motions of 75 Galactic globular clusters, nine dwarf spheroidal galaxies, one ultra-faint system, and the Large and Small Magellanic Clouds.
Methods. Using data extracted from the Gaia archive, we derived the proper motions and parallaxes for these systems, as well as their uncertainties. We demonstrate that the errors, statistical and systematic, are relatively well understood. We integrated the orbits of these objects in three different Galactic potentials, and characterised their properties. We present the derived proper motions, space velocities, and characteristic orbital parameters in various tables to facilitate their use by the astronomical community.
Results. Our limited and straightforward analyses have allowed us for example to (i) determine absolute and very precise proper motions for globular clusters; (ii) detect clear rotation signatures in the proper motions of at least five globular clusters; (iii) show that the satellites of the Milky Way are all on high-inclination orbits, but that they do not share a single plane of motion; (iv) derive a lower limit for the mass of the Milky Way of 9.1-2.6+6.2 × 1011 M⊙ based on the assumption that the Leo I dwarf spheroidal is bound; (v) derive a rotation curve for the Large Magellanic Cloud based solely on proper motions that is competitive with line-of-sight velocity curves, now using many orders of magnitude more sources; and (vi) unveil the dynamical effect of the bar on the motions of stars in the Large Magellanic Cloud.
Conclusions. All these results highlight the incredible power of the Gaia astrometric mission, and in particular of its second data release.
Funding
This work presents results from the European Space
Agency (ESA) space mission Gaia. Gaia data are being processed by the
Gaia Data Processing and Analysis Consortium (DPAC). Funding for the
DPAC is provided by national institutions, in particular the institutions
participating in the Gaia MultiLateral Agreement (MLA). The Gaia mission
website is https://www.cosmos.esa.int/gaia. The Gaia archive website
is https://archives.esac.esa.int/gaia. The Gaia mission and data
processing have financially been supported, in alphabetical order by country,
by the Algerian Centre de Recherche en Astronomie, Astrophysique et Géophysique of Bouzareah Observatory; the Austrian Fonds zur Förderung der
wissenschaftlichen Forschung (FWF) Hertha Firnberg Programme through
grants T359, P20046, and P23737; the BELgian federal Science Policy Office
(BELSPO) through various PROgramme de Développement d’Expériences
scientifiques (PRODEX) grants and the Polish Academy of Sciences - Fonds
Wetenschappelijk Onderzoek through grant VS.091.16N; the Brazil-France
exchange programmes Fundação de Amparo à Pesquisa do Estado de São Paulo
(FAPESP) and Coordenação de Aperfeicoamento de Pessoal de Nível Superior (CAPES)-Comité Français d’Évaluation de la Coopération Universitaire et
Scientifique avec le Brésil (COFECUB); the Chilean Dirección de Gestión
de la Investigación (DGI) at the University of Antofagasta and the Comité
Mixto ESO-Chile; the National Science Foundation of China (NSFC) through
grants 11573054 and 11703065; the Czech Republic Ministry of Education,
Youth, and Sports through grant LG 15010, the Czech Space Office through
ESA PECS contract 98058, and Charles University Prague through grant
PRIMUS/SCI/17; the Danish Ministry of Science; the Estonian Ministry of Education and Research through grant IUT40-1; the European Commission’s Sixth
Framework Programme through the European Leadership in Space Astrometry (https://www.cosmos.esa.int/web/gaia/elsa-rtn-programme
History
Citation
Astronomy and Astrophysics, 2018, 616, A12
Author affiliation
/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy
Version
VoR (Version of Record)
Published in
Astronomy and Astrophysics
Publisher
EDP Sciences for European Southern Observatory (ESO)