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

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 clus...

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Autores: Helmi, A., Leeuwen, F. van, McMillan, Paul J., Massari, D., Antoja, Teresa, Robin, A.C., Lindegren, L., Bastian, U., Arenou, F., Babusiaux, Carine, Biermann, Michael, Breddels, M.A., Hobbs, D., Jordi, C., Pancino, E., Reylé, Céline, Veljanoski, J., Brown, Anthony G.A., Vallenari, Antonella, Carballo Fidalgo, Ruth
Tipo de documento: artigo
Data de publicação:2018
País:España
Recursos:Universidad de Cantabria (UC)
Repositório:UCrea Repositorio Abierto de la Universidad de Cantabria
Idioma:inglês
OAI Identifier:oai:repositorio.unican.es:10902/14561
Acesso em linha:http://hdl.handle.net/10902/14561
Access Level:Acceso aberto
Palavra-chave:Galaxy: kinematics and dynamics
Astrometry
Globular clusters: general
Galaxies: dwarf
Local Group
Magellanic Clouds
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spelling Gaia Data Release 2: Kinematics of globular clusters and dwarf galaxies around the Milky WayHelmi, A.Leeuwen, F. vanMcMillan, Paul J.Massari, D.Antoja, TeresaRobin, A.C.Lindegren, L.Bastian, U.Arenou, F.Babusiaux, CarineBiermann, MichaelBreddels, M.A.Hobbs, D.Jordi, C.Pancino, E.Reylé, CélineVeljanoski, J.Brown, Anthony G.A.Vallenari, AntonellaCarballo Fidalgo, RuthGalaxy: kinematics and dynamicsAstrometryGlobular clusters: generalGalaxies: dwarfLocal GroupMagellanic CloudsAims. 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 +6.2 -2.6 × 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 reléase.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 http://gea. esac.esa.int/archive/. The Gaia mission and data processing have financially been supported by the Spanish Ministry of Economy (MINECO/FEDER, UE) through grants ESP2014-55996-C2-1-R, ESP2014-55996-C2-2-R, ESP2016-80079-C2-1-R, and ESP2016-80079-C2-2-R, the Spanish Ministerio de Economía, Industria y Competitividad through grant AyA2014-55216.EDP SciencesUniversidad de Cantabria20182018-08-10journal articlehttp://purl.org/coar/resource_type/c_6501NAhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43info:eu-repo/semantics/articlehttp://hdl.handle.net/10902/14561Astronomy & Astrophysics, 2018, 616, A12 - (CORRIGENDUM), 2020, 637, C3 - (CORRIGENDUM), 2020, 642, C1reponame:UCrea Repositorio Abierto de la Universidad de Cantabriainstname:Universidad de Cantabria (UC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:repositorio.unican.es:10902/145612026-06-02T12:39:31Z
dc.title.none.fl_str_mv Gaia Data Release 2: Kinematics of globular clusters and dwarf galaxies around the Milky Way
title Gaia Data Release 2: Kinematics of globular clusters and dwarf galaxies around the Milky Way
spellingShingle Gaia Data Release 2: Kinematics of globular clusters and dwarf galaxies around the Milky Way
Helmi, A.
Galaxy: kinematics and dynamics
Astrometry
Globular clusters: general
Galaxies: dwarf
Local Group
Magellanic Clouds
title_short Gaia Data Release 2: Kinematics of globular clusters and dwarf galaxies around the Milky Way
title_full Gaia Data Release 2: Kinematics of globular clusters and dwarf galaxies around the Milky Way
title_fullStr Gaia Data Release 2: Kinematics of globular clusters and dwarf galaxies around the Milky Way
title_full_unstemmed Gaia Data Release 2: Kinematics of globular clusters and dwarf galaxies around the Milky Way
title_sort Gaia Data Release 2: Kinematics of globular clusters and dwarf galaxies around the Milky Way
dc.creator.none.fl_str_mv Helmi, A.
Leeuwen, F. van
McMillan, Paul J.
Massari, D.
Antoja, Teresa
Robin, A.C.
Lindegren, L.
Bastian, U.
Arenou, F.
Babusiaux, Carine
Biermann, Michael
Breddels, M.A.
Hobbs, D.
Jordi, C.
Pancino, E.
Reylé, Céline
Veljanoski, J.
Brown, Anthony G.A.
Vallenari, Antonella
Carballo Fidalgo, Ruth
author Helmi, A.
author_facet Helmi, A.
Leeuwen, F. van
McMillan, Paul J.
Massari, D.
Antoja, Teresa
Robin, A.C.
Lindegren, L.
Bastian, U.
Arenou, F.
Babusiaux, Carine
Biermann, Michael
Breddels, M.A.
Hobbs, D.
Jordi, C.
Pancino, E.
Reylé, Céline
Veljanoski, J.
Brown, Anthony G.A.
Vallenari, Antonella
Carballo Fidalgo, Ruth
author_role author
author2 Leeuwen, F. van
McMillan, Paul J.
Massari, D.
Antoja, Teresa
Robin, A.C.
Lindegren, L.
Bastian, U.
Arenou, F.
Babusiaux, Carine
Biermann, Michael
Breddels, M.A.
Hobbs, D.
Jordi, C.
Pancino, E.
Reylé, Céline
Veljanoski, J.
Brown, Anthony G.A.
Vallenari, Antonella
Carballo Fidalgo, Ruth
author2_role author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Universidad de Cantabria
dc.subject.none.fl_str_mv Galaxy: kinematics and dynamics
Astrometry
Globular clusters: general
Galaxies: dwarf
Local Group
Magellanic Clouds
topic Galaxy: kinematics and dynamics
Astrometry
Globular clusters: general
Galaxies: dwarf
Local Group
Magellanic Clouds
description 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 +6.2 -2.6 × 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 reléase.
publishDate 2018
dc.date.none.fl_str_mv 2018
2018-08-10
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
NA
http://purl.org/coar/version/c_be7fb7dd8ff6fe43
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10902/14561
url http://hdl.handle.net/10902/14561
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv Astronomy & Astrophysics, 2018, 616, A12 - (CORRIGENDUM), 2020, 637, C3 - (CORRIGENDUM), 2020, 642, C1
reponame:UCrea Repositorio Abierto de la Universidad de Cantabria
instname:Universidad de Cantabria (UC)
instname_str Universidad de Cantabria (UC)
reponame_str UCrea Repositorio Abierto de la Universidad de Cantabria
collection UCrea Repositorio Abierto de la Universidad de Cantabria
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,301603

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