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Constraints on thin and thick disc formation from new analysis of 2MASS and SDSS surveys

Published online by Cambridge University Press:  17 July 2015

A.C. Robin ,
C. Reylé ,
E.B. Amôres  and
A.M.M. Martins
A.C. Robin
Affiliation:
Institut Utinam, CNRS UMR 6213, Université de Franche-Comté, OSU THETA Franche-Comté-Bourgogne, France
C. Reylé
Affiliation:
Institut Utinam, CNRS UMR 6213, Université de Franche-Comté, OSU THETA Franche-Comté-Bourgogne, France
E.B. Amôres
Affiliation:
UEFS, Departamento de Física, Novo Horizonte, Feira de Santana, Brazil
A.M.M. Martins
Affiliation:
Institut Utinam, CNRS UMR 6213, Université de Franche-Comté, OSU THETA Franche-Comté-Bourgogne, France
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Abstract

Two new analysis of SDSS and 2MASS surveys are used to constrain the characteristics of the thin and thick disc of the Milky Way, based on a population synthesis model and a MCMC scheme to constrain model parameters. These studies show that 1) the thick disc has been formed during an extended period of time and it was contracting during this phase; 2) the external thin disc is shown to have characteristics which vary with age such as the scale length, warp orientation, warp and flare slopes. The thick disc undergoing a contraction with time while the thin disc forming inside-out clearly indicate that they are truly distinct components of the Galaxy.

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. 199 - 203
Copyright
© EAS, EDP Sciences, 2015

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