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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/24637
Title: The VMC survey - XIV. First results on the look-back time star formation rate tomography of the Small Magellanic Cloud
Authors: RUBELE, STEFANO 
GIRARDI, Leo Alberto 
Kerber, Leandro
Cioni, Maria-Rosa L.
Piatti, Andrés E.
ZAGGIA, Simone 
Bekki, Kenji
BRESSAN, Alessandro
CLEMENTINI, Gisella 
de Grijs, Richard
Emerson, Jim P.
Groenewegen, Martin A. T.
Ivanov, Valentin D.
MARCONI, Marcella 
Marigo, Paola
Moretti, Maria Ida 
RIPEPI, Vincenzo 
Subramanian, Smitha
Tatton, Benjamin L.
van Loon, Jacco Th.
Issue Date: 2015
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 449
Issue: 1
First Page: 639
Abstract: We analyse deep images from the VISTA survey of the Magellanic Clouds in the YJ{K_s} filters, covering 14 deg<SUP>2</SUP> (10 tiles), split into 120 subregions, and comprising the main body and Wing of the Small Magellanic Cloud (SMC). We apply a colour-magnitude diagram reconstruction method that returns their best-fitting star formation rate SFR(t), age-metallicity relation (AMR), distance and mean reddening, together with 68 per cent confidence intervals. The distance data can be approximated by a plane tilted in the East-West direction with a mean inclination of 39°, although deviations of up to ±3 kpc suggest a distorted and warped disc. After assigning to every observed star a probability of belonging to a given age-metallicity interval, we build high-resolution population maps. These dramatically reveal the flocculent nature of the young star-forming regions and the nearly smooth features traced by older stellar generations. They document the formation of the SMC Wing at ages <0.2 Gyr and the peak of star formation in the SMC Bar at ̃40 Myr. We clearly detect periods of enhanced star formation at 1.5 and 5 Gyr. The former is possibly related to a new feature found in the AMR, which suggests ingestion of metal-poor gas at ages slightly larger than 1 Gyr. The latter constitutes a major period of stellar mass formation. We confirm that the SFR(t) was moderately low at even older ages.
Acknowledgments: 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 Facility Council (STFC) in the UK. RdG acknowledges partial research support from the National Natural Science Foundation of China (NSFC) through grant 11373010. This work was partially supported by the Argentinian institutions CONICET and Agencia Nacional de Promoción Científica y Tecnológica (ANPCyT). PM acknowledges the support from the ERC Consolidator Grant funding scheme ( project STARKEY , G.A. no. 615604).
URI: http://hdl.handle.net/20.500.12386/24637
URL: https://academic.oup.com/mnras/article/449/1/639/1297726
ISSN: 0035-8711
DOI: 10.1093/mnras/stv141
Bibcode ADS: 2015MNRAS.449..639R
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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