The VMC survey - XV. The Small Magellanic Cloud-Bridge connection history as traced by their star cluster populations

Journal
Date Issued
2015
Author(s)
Piatti, Andrés E.
•
de Grijs, Richard
•
•
Cioni, Maria-Rosa L.
•
•
Kerber, Leandro
DOI
Description
We thank the Cambridge Astronomy Survey Unit (CASU) and the Wide-Field Astronomy Unit (WFAU) in Edinburgh for providing calibrated data products under the support of the Science and Technology Facilities Council (STFC) in the UK. This research has made use of the SIMBAD data base, operated at CDS, Strasbourg, France, and draws upon data distributed through the NOAO Science Archive. We thank the anonymous referee whose comments and suggestions allowed us to improve the manuscript. This work was partially supported by the Argentinian institutions CONICET and Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT). RdG acknowledges research support from the National Natural Science Foundation of China (NSFC; grant 11373010).
Abstract
We present results based on YJKs photometry of star clusters located in the outermost, eastern region of the Small Magellanic Cloud (SMC). We analysed a total of 51 catalogued clusters whose colour-magnitude diagrams (CMDs), having been cleaned from field-star contamination, were used to assess the clusters' reality and estimate ages of the genuine systems. Based on CMD analysis, 15 catalogued clusters were found to be possible non-genuine aggregates. We investigated the properties of 80 per cent of the catalogued clusters in this part of the SMC by enlarging our sample with previously obtained cluster ages, adopting a homogeneous scale for all. Their spatial distribution suggests that the oldest clusters, log(t yr-1) ≥ 9.6, are in general located at greater distances to the galaxy's centre than their younger counterparts - 9.0 ≤ log(t yr-1) ≤ 9.4 - while two excesses of clusters are seen at log(t yr-1) ̃ 9.2 and log(t yr-1) ̃ 9.7. We found a trail of younger clusters which follow the wing/bridge components. This long spatial sequence does not only harbour very young clusters, log(t yr-1) ̃ 7.3, but it also hosts some of intermediate ages, log(t yr-1) ̃ 9.1. The derived cluster and field-star formation frequencies as a function of age are different. The most surprising feature is an observed excess of clusters with ages of log(t yr-1) < 9.0, which could have been induced by interactions with the LMC.
Volume
450
Issue
1
Start page
552
Uri
Url
Issn Identifier
0035-8711
Ads BibCode
2015MNRAS.450..552P
Rights
open.access
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