The VMC survey XXXVIII. Proper motion of the Magellanic Bridge
| Autor: | Thomas Schmidt, Vincenzo Ripepi, Richard de Grijs, Anna B. A. Queiroz, Monika G. Petr-Gotzens, Cameron P. M. Bell, Jim Emerson, Dalal El Youssoufi, Valentin D. Ivanov, Gal Matijevic, Florian Niederhofer, Martin Groenewegen, Kenji Bekki, Jonathan Diaz, Joana M. Oliveira, Maria-Rosa L. Cioni, Jacco Th. van Loon |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Proper motion
Milky Way Population FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences 0103 physical sciences Astrophysics::Solar and Stellar Astrophysics Large Magellanic Cloud education 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Dwarf galaxy Physics education.field_of_study 010308 nuclear & particles physics Astrophysics::Instrumentation and Methods for Astrophysics Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies Galaxy Photometry (astronomy) Stars Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) Astrophysics::Earth and Planetary Astrophysics QB799 |
| ISSN: | 0004-6361 |
| Popis: | The Magellanic Clouds are a nearby pair of interacting dwarf galaxies and satellites of the Milky Way. Studying their kinematic properties is essential to understanding their origin and dynamical evolution. They have prominent tidal features and the kinematics of these features can give hints about the formation of tidal dwarfs, galaxy merging and the stripping of gas. In addition they are an example of dwarf galaxies that are in the process of merging with a massive galaxy. The goal of this study is to investigate the kinematics of the Magellanic Bridge, a tidal feature connecting the Magellanic Clouds, using stellar proper motions to understand their most recent interaction. We calculated proper motions based on multi-epoch $K_{s}$-band aperture photometry, which were obtained with the Visible and Infrared Survey Telescope for Astronomy (VISTA), spanning a time of 1-3 yr, and we compared them with $Gaia$ Data Release 2 (DR2) proper motions. We tested two methods for removing Milky Way foreground stars using $Gaia$~DR2 parallaxes in combination with VISTA photometry or using distances based on Bayesian inference. We obtained proper motions for a total of 576,411 unique sources over an area of $23$ deg$^{2}$ covering the Magellanic Bridge including mainly Milky Way foreground stars, background galaxies, and a small population of possible Magellanic Bridge stars ($ Comment: 17 pages, 12 figures, accepted for publication in A&A |
| Databáze: | OpenAIRE |
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