SIMBAD references

2015MNRAS.449..639R - Mon. Not. R. Astron. Soc., 449, 639-661 (2015/May-1)

The VMC survey - XIV. First results on the look-back time star formation rate tomography of the Small Magellanic Cloud.

RUBELE S., GIRARDI L., KERBER L., CIONI M.-R.L., PIATTI A.E., ZAGGIA S., BEKKI K., BRESSAN A., CLEMENTINI G., DE GRIJS R., EMERSON J.P., GROENEWEGEN M.A.T., IVANOV V.D., MARCONI M., MARIGO P., MORETTI M.-I., RIPEPI V., SUBRAMANIAN S., TATTON B.L. and VAN LOON J.Th.

Abstract (from CDS):

We analyse deep images from the VISTA survey of the Magellanic Clouds in the YJK_s filters, covering 14 deg2 (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 percent 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.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): Hertzsprung-Russell and colour-magnitude diagrams - Magellanic Clouds

VizieR on-line data: <Available at CDS (J/MNRAS/449/639): table3.dat>

Simbad objects: 7

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2020.01.20-12:25:22

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