M.-R.L. Cioni
The VMC survey IX. Pilot study of the proper motion of stellar populations in the LMC from 2MASS and VISTA data
Cioni, M.-R.L.; Girardi, L.; Moretti, M.I.; Piffl, T.; Ripepi, V.; Rubele, S.; Scholz, R.-D.; Bekki, K.; Clementini, G.; Ivanov, V.D.; Oliveira, J.M.; Van Loon, J.Th.
Authors
L. Girardi
M.I. Moretti
T. Piffl
V. Ripepi
S. Rubele
R.-D. Scholz
K. Bekki
G. Clementini
V.D. Ivanov
Joana Maria Oliveira j.oliveira@keele.ac.uk
Jacobus Van Loon j.t.van.loon@keele.ac.uk
Abstract
Context. Proper motion (PM) studies are fundamental ingredients in the understanding of the orbital history of galaxies. Current measurements do not yet provide a satisfactory answer to the possible scenarios for the formation and evolution of the Magellanic Clouds and of the Bridge and Stream that link them with each other and with our Galaxy.
Aims. We use multi-epoch near-infrared observations from the VISTA survey of the Magellanic Cloud system (VMC) to measure the PM of stars of the Large Magellanic Cloud (LMC), in one tile of 1.5 deg2 centred at (a,d) = (05:59:23.136, -66:20:28.68) and including the south ecliptic pole, with respect to their Two Micron All Sky Survey (2MASS) position over a time baseline of about 10 years. Proper motions from VMC observations only, spanning a time range of about 1 year, are also derived.
Methods. Stars of different ages are selected from the colour-magnitude diagram, (J - Ks) vs. Ks, and their average coordinate displacement is computed from the difference between Ks band observations from VMC and 2MASS or among VMC data alone for stars as faint as Ks = 19 mag. Proper motions are derived by averaging up to seven 2MASS-VMC combinations in the first case and from the slope of the best-fit line among the seven VMC epochs in the second case. Separate PM values are obtained for Cepheids, RR Lyrae stars, long period variables, and eclipsing binary stars in the field.
Results. The PM of ~40 000 LMC stars in the tile, with respect to ~8000 background galaxies, obtained from VMC data alone, is µacos (d) = +2.20 ± 0.06 (stat) ±0.29 (sys) and µd = +1.70 ± 0.06 (stat) ±0.30 (sys) mas yr-1. This value agrees with recent ground-based determinations, but is larger than studies with the Hubble Space Telescope; this discrepancy may be due to additional systematic errors in the data. Our result implies either higher tangential motion or higher internal motion, or a combination of these, although we cannot discuss these possibilities quantitatively based on one field. The PM of the LMC is also clearly distinct from the PM derived for stars in the Milky Way foreground. The relative PM between the foreground stars and the LMC stars is ~5 mas?yr-1. Furthermore, we measure a decrease in the PM with increasing logarithm of stellar age for LMC stars.
Conclusions. This study, based on just one VMC tile, shows the potential of the 2MASS-VMC and VMC-VMC combinations for a comprehensive investigation of PM across the Magellanic system.
Citation
Cioni, M., Girardi, L., Moretti, M., Piffl, T., Ripepi, V., Rubele, S., …Van Loon, J. (2014). The VMC survey IX. Pilot study of the proper motion of stellar populations in the LMC from 2MASS and VISTA data. Astronomy & Astrophysics, 562, Article A32. https://doi.org/10.1051/0004-6361/201322100
Journal Article Type | Article |
---|---|
Acceptance Date | Oct 25, 2013 |
Publication Date | Feb 4, 2014 |
Journal | ASTRONOMY & ASTROPHYSICS |
Print ISSN | 0004-6361 |
Publisher | EDP Sciences |
Peer Reviewed | Peer Reviewed |
Volume | 562 |
Article Number | A32 |
DOI | https://doi.org/10.1051/0004-6361/201322100 |
Keywords | surveys; Magellanic Clouds; infrared: stars; proper motions |
Publisher URL | https://doi.org/10.1051/0004-6361/201322100 |
Files
J Oliveira - IX Pilot study of the proper motion of stellar populations....pdf
(6.3 Mb)
PDF
Publisher Licence URL
https://creativecommons.org/licenses/by/4.0/
You might also like
The Detection of Deuterated Water in the Large Magellanic Cloud with ALMA
(2022)
Journal Article
The VMC survey - XLVI. Stellar proper motions in the centre of the Large Magellanic Cloud
(2022)
Journal Article
The first detection of deuterated water toward extragalactic hot cores with ALMA
(2021)
Journal Article
Downloadable Citations
About Keele Repository
Administrator e-mail: research.openaccess@keele.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2025
Advanced Search