Niederhofer, F, Cioni, M-RL, Rubele, S, Schmidt, T, Bekki, K, de Grijs, R, Emerson, J, Ivanov, VD, Marconi, M, Oliveira, JM, Petr-Gotzens, MG, Ripepi, V, van Loon, JT and Zaggia, S (2018) XXX. Stellar proper motions in the central parts of the Small Magellanic Cloud. Astronomy and Astrophysics, 613. ISSN 1432-0746

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Abstract

We present the first spatially resolved map of stellar proper motions within the central (similar to 3.1 x 2.4 kpc) regions of the Small Magellanic Cloud (SMC). The data used for this study encompasses four tiles from the ongoing near-infrared VISTA survey of the Magellanic Clouds system and covers a total contiguous area on the sky of similar to 6.81 deg(2). Proper motions have been calculated independently in two dimensions from the spatial offsets in the K-s filter over time baselines between 22 and 27 months. The reflex motions of approximately 33 000 background galaxies are used to calibrate the stellar motions to an absolute scale. The resulting catalog is composed of more than 690 000 stars which have been selected based on their position in the (J - K-s; K-s) color-magnitude diagram. For the median absolute proper motion of the SMC, we find (mu(alpha) cos(delta), mu(alpha)) = (1.087 +/- 0.192 (sys.) +/- 0.003 (stat.), -1.187 +/- 0.008 (sys.) +/- 0.003 (stat.)) mas yr(-1), consistent with previous studies. Mapping the proper motions as a function of position within the SMC reveals a nonuniform velocity pattern indicative of a tidal feature behind the main body of the SMC and a flow of stars in the south-east moving predominantly along the line-of-sight.

Item Type: Article
Additional Information: © 2018 EDP Sciences. This is the final published version of the article (version of record). It first appeared online via EDP Sciences at http://doi.org/10.1051/0004-6361/201833144 - please refer to any applicable terms of use of the publisher.
Uncontrolled Keywords: proper motions, surveys, galaxies, individual, SMC – Magellanic Clouds, stars, kinematics and dynamics
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 22 Jun 2018 10:09
Last Modified: 22 Jun 2018 10:24
URI: http://eprints.keele.ac.uk/id/eprint/5043

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