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Statistical analysis of large scale surveys for constraining the Galaxy evolution

Published online by Cambridge University Press:  17 July 2015

A.M.M. Martins  and
A.C. Robin
A.M.M. Martins
Affiliation:
Institut Utinam, CNRS UMR 6213, Université de Franche-Comté, OSU THETA Franche-Comté-Bourgogne, Besançon, France
A.C. Robin
Affiliation:
Institut Utinam, CNRS UMR 6213, Université de Franche-Comté, OSU THETA Franche-Comté-Bourgogne, Besançon, France
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Abstract

The formation and evolution of the thick disc of the Milky Way remain controversial. We make use of the Besançon Galaxy model, which among other utilities can be used for data interpretation and to test different scenarios of galaxy formation and evolution. We examine these questions by studying the metallicity distribution of the thin and thick disc with the help of a sample of Main Sequence turn-off stars from the SEGUE survey. We developed a tool based on a MCMC-ABC method to determine the metallicity distribution and study the correlation between the fitted parameters. We obtained a local metallicity of the thick disc of − 0.47 ± 0.03 dex similar to previous studies and the thick disc shows no gradient. A flat gradient in the thick disc can be a consequence of radial mixing or the result of a strong turbulent gaseous disc.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 68: The Milky Way Unravelled by Gaia: GREAT Science from the Gaia Data Releases , 2014 , pp. 191 - 194
Copyright
© EAS, EDP Sciences, 2015

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