2026-04-14T05:27:48Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/2164692024-11-26T19:15:37Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

00925njm 22002777a 4500 dc Eyer, L. author Molina, M. author Mor Crespo, Roger author Julbe, Francesc author Antoja Castelltort, M. Teresa author Jordi i Nebot, Carme author Borrachero, Raúl author Luri Carrascoso, Xavier author Castañeda Pons, Javier Bernardo author Fabricius, Claus author Masana Fresno, Eduard author Portell i de Mora, Jordi author Clotet Altarriba, Marcial author Balaguer Núñez, María de los Dolores author Bartolomé Muñoz, Sergi author Borrachero, Raúl author Cantat Gaudin, Tristan author Carrasco, José Manuel (Carrasco Martínez) author Farras Casas, Martí author Figueras Siñol, Francesca author Garralda Torre, Nora author Romero Gómez, Mercè author Soria Nieto, Sergio author Voss, Hölger author Antiche Garzón, Erika author Torra Roca, Jorge author González Vidal, Juan José author Gaia Collaboration author Weiler, Michael author Castro Ginard, Alfred author Chemin, Laurent author Casamiquela, Laia author Bastian, U. author Lindegren, L. author 2024-11-14T11:18:42Z 2024-11-14T11:18:42Z 2020-10-01 2024-11-14T11:18:42Z 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. http://hdl.handle.net/2445/216469 Cúmuls d'estels Galàxies Astrometria Clusters of stars Galaxies Astrometry Erratum: Gaia Data Release 2: The kinematics of globular clusters and dwarf galaxies around the Milky Way