dc.contributor.author Cioni, M-R.L. dc.contributor.author Giradi, L. dc.contributor.author Moretti, M.I. dc.contributor.author Piffl, T. dc.contributor.author Ripepi, V. dc.contributor.author Rubele, S. dc.contributor.author Scholz, R.D. dc.contributor.author Bekki, K. dc.contributor.author Clementini, G. dc.contributor.author Ivanov, V.D. dc.contributor.author Oliveira, J.M. dc.contributor.author van Loon, J. Th dc.date.accessioned 2014-02-06T14:59:03Z dc.date.available 2014-02-06T14:59:03Z dc.date.issued 2014-02 dc.identifier.citation Cioni , M-RL , Giradi , 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 T 2014 , ' The VMC survey - IX : Pilot study of the proper motion of stellar populations in the LMC from 2MASS and VISTA data ' , Astronomy and Astrophysics , vol. 562 , A32 . https://doi.org/10.1051/0004-6361/201322100 dc.identifier.issn 0004-6361 dc.identifier.other PURE: 2599242 dc.identifier.other PURE UUID: a9d136ff-25cd-4b8a-be7d-7bb2233b9232 dc.identifier.other Scopus: 84893757954 dc.identifier.uri http://hdl.handle.net/2299/12769 dc.description Published under open access option dc.description.abstract 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. 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 deg^2 centred at (alpha, delta) = (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. Stars of different ages are selected from the colour-magnitude diagram, (J-K_s) vs. K_s, and their average coordinate displacement is computed from the difference between K_s band observations from VMC and 2MASS or among VMC data alone for stars as faint as $K_\mathrm{s}=19$ 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. The PM of ~40,000 LMC stars in the tile, with respect to ~8000 background galaxies, obtained from VMC data alone, is mu_alpha cos(delta) = +2.20+/-0.06 (stat) +/-0.29 (sys) and mu_delta = +1.70+/-0.06 (stat) +/-0.30 (sys) mas/yr. 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. Furthermore, we measure a decrease in the PM with increasing logarithm of stellar age for LMC stars. 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. en dc.format.extent 16 dc.language.iso eng dc.relation.ispartof Astronomy and Astrophysics dc.rights Open dc.title The VMC survey - IX : Pilot study of the proper motion of stellar populations in the LMC from 2MASS and VISTA data en dc.contributor.institution School of Physics, Astronomy and Mathematics dc.contributor.institution Science & Technology Research Institute dc.contributor.institution Centre for Astrophysics Research dc.description.status Peer reviewed dc.identifier.url http://adsabs.harvard.edu/abs/2013arXiv1306.4336C dc.relation.school School of Physics, Astronomy and Mathematics dc.description.versiontype Final Published version dcterms.dateAccepted 2014-02 rioxxterms.version VoR rioxxterms.versionofrecord https://doi.org/10.1051/0004-6361/201322100 rioxxterms.type Journal Article/Review herts.preservation.rarelyaccessed true herts.rights.accesstype Open
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