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Gaia Data Release 2 Kinematics of globular clusters and dwarf galaxies around the Milky Way

Helmi, Amina; van Leeuwen, F.; McMillan, P.; Massari, D.; Antoja, T.; Robin, A. C.; Lindegren, L.; Bastian, U.; Arenou, F.; Babusiaux, C.; Žerjal, Maruša

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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...[Show more]

dc.contributor.authorHelmi, Amina
dc.contributor.authorvan Leeuwen, F.
dc.contributor.authorMcMillan, P.
dc.contributor.authorMassari, D.
dc.contributor.authorAntoja, T.
dc.contributor.authorRobin, A. C.
dc.contributor.authorLindegren, L.
dc.contributor.authorBastian, U.
dc.contributor.authorArenou, F.
dc.contributor.authorBabusiaux, C.
dc.contributor.authorŽerjal, Maruša
dc.date.accessioned2019-11-20T03:30:32Z
dc.date.available2019-11-20T03:30:32Z
dc.identifier.issn0004-6361
dc.identifier.urihttp://hdl.handle.net/1885/186427
dc.description.abstractAims. 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; (i v) derive a lower limit for the mass of the Milky Way of 9.1(-2.6)(+6.2) x 10(11) M-circle dot 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 (v i) 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.
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherSpringer
dc.rights© ESO 2018
dc.sourceAstronomy and Astrophysics
dc.titleGaia Data Release 2 Kinematics of globular clusters and dwarf galaxies around the Milky Way
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume616
dc.date.issued2018
local.identifier.absfor020104 - Galactic Astronomy
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.absfor020103 - Cosmology and Extragalactic Astronomy
local.identifier.ariespublicationu4485658xPUB1736
local.publisher.urlhttps://link.springer.com
local.type.statusPublished Version
local.contributor.affiliationHelmi, Amina, University of Groningen
local.contributor.affiliationvan Leeuwen, F, University of Cambridge
local.contributor.affiliationMcMillan, P, Lund Observatory
local.contributor.affiliationMassari, D, University of Groningen
local.contributor.affiliationAntoja, T, University of Groningen
local.contributor.affiliationRobin, A C, University of Burgundy - Franche-Comté
local.contributor.affiliationLindegren, L, Lund University
local.contributor.affiliationBastian, U, Universität Heidelberg
local.contributor.affiliationArenou, F, PSL Research University
local.contributor.affiliationBabusiaux, C, Universite Grenoble Alpes
local.contributor.affiliationZerjal, Marusa, College of Science, ANU
local.bibliographicCitation.issue12
local.bibliographicCitation.startpage1
local.bibliographicCitation.lastpage47
local.identifier.doi10.1051/0004-6361/201832698
local.identifier.absseo970109 - Expanding Knowledge in Engineering
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2019-05-12T08:19:42Z
local.identifier.thomsonID000441203000012
dcterms.accessRightsOpen Access
dc.provenancehttp://sherpa.ac.uk/romeo/issn/0004-6361/..."author can archive publisher's version/PDF" from SHERPA/RoMEO site (as at 20/11/19).
CollectionsANU Research Publications

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