Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Gaia Data Release 2: Kinematics of globular clusters and dwarf galaxies around the Milky Way
Kapteyn Astronomical Institute, University of Groningen, Landleven 12, 9747 AD Groningen, The Netherlands.
Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK.
Lund Observatory, Department of Astronomy and Theoretical Physics, Lund University, Box 43, 22100 Lund, Sweden.
Kapteyn Astronomical Institute, University of Groningen, Landleven 12, 9747 AD Groningen, The Netherlands.
Show others and affiliations
2018 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 16, no A12Article in journal (Refereed) Published
Abstract [en]

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; (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.

Place, publisher, year, edition, pages
EDP Sciences, 2018. Vol. 16, no A12
Keywords [en]
Galaxy: kinematics and dynamics, astrometry, globular clusters: general, galaxies: dwarf, Local Group, Magellanic Clouds
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Onboard Space Systems
Identifiers
URN: urn:nbn:se:ltu:diva-70553DOI: 10.1051/0004-6361/201832698ISI: 000441203000012Scopus ID: 2-s2.0-85051852234OAI: oai:DiVA.org:ltu-70553DiVA, id: diva2:1241394
Note

Validerad;2018;Nivå 2;2018-08-23 (andbra);Group Author(s): Gaia Collaboration(andbra)

Two corrections are available for this publication, please see:

A. Helmi, F. van Leeuwen, P. J. McMillan et al. Gaia Data Release 2 - Kinematics of globular clusters and dwarf galaxies around the Milky Way (Corrigendum), Astronomy & Astrophysics (A&A), 637 (2020) C3.  https://doi.org/10.1051/0004-6361/201832698e

A. Helmi, F. van Leeuwen, P. J. McMillan et al. Gaia Data Release 2 - Kinematics of globular clusters and dwarf galaxies around the Milky Way (Corrigendum), Astronomy & Astrophysics (A&A), 642 (2020) C1. https://doi.org/10.1051/0004-6361/202039217

Available from: 2018-08-23 Created: 2018-08-23 Last updated: 2024-11-11Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Authority records

Granvik, M.

Search in DiVA

By author/editor
Granvik, M.
By organisation
Space Technology
In the same journal
Astronomy and Astrophysics
Other Electrical Engineering, Electronic Engineering, Information Engineering

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 111 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf