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Kinematics of the Milky Way disc from the RAVE survey combined with Gaia DR1

Published online by Cambridge University Press:  02 August 2018

Annie C. Robin ,
Olivier Bienaymé ,
José G. Fernández-Trincado  and
Céline Reylé
Annie C. Robin
Affiliation:
Institut Utinam, CNRS UMR6213, Univ. Bourgogne Franche-Comté, OSU THETA, Observatoire de Besançon, BP 1615, 25010 Besançon Cedex, France email: annie.robin@obs-besancon.fr
Olivier Bienaymé
Affiliation:
Observatoire Astronomique de Strasbourg, Université de Strasbourg, CNRS, 11 rue de l’Université, F-67000 Strasbourg, France email: olivier.bienayme@astro.unistra.fr
José G. Fernández-Trincado
Affiliation:
Institut Utinam, CNRS UMR6213, Univ. Bourgogne Franche-Comté, OSU THETA, Observatoire de Besançon, BP 1615, 25010 Besançon Cedex, France email: annie.robin@obs-besancon.fr
Céline Reylé
Affiliation:
Institut Utinam, CNRS UMR6213, Univ. Bourgogne Franche-Comté, OSU THETA, Observatoire de Besançon, BP 1615, 25010 Besançon Cedex, France email: annie.robin@obs-besancon.fr
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Abstract

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Relying on the complementarity of Gaia proper motions with radial velocities of the RAVE survey, we attempt to constrain the kinematics of the Milky Way disc. Based on the population synthesis model, we simulate the observations, applying the detailed selection functions of the observations. The dynamics is described using a global gravitational potential computed from the mass distribution of the population model, approximated by a Stäckel potential (Bienaymé et al. 2015). We explore a set of free parameters (solar motion, age - velocity dispersion of the disc as a function of age, the velocity gradients, vertex deviation) using a Markov Chain Monte Carlo method. We show that the fitted model reproduces very well the radial velocity and proper motion distributions, allowing to constrain the thin and thick disc secular evolution with time.

Keywords

Galaxy:evolutionGalaxy:dynamicsGalaxy:kinematicsGalaxy: stellar content
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S334: Rediscovering our Galaxy , July 2017 , pp. 120 - 123
Copyright
Copyright © International Astronomical Union 2018 

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