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Dynamical models and Galaxy surveys

Published online by Cambridge University Press:  06 January 2014

James Binney  and
Jason L. Sanders
James Binney
Affiliation:
Rudolf Peierls Centre for Theoretical Physics, Keble Road, Oxford, OX1 3NP, UK email: [email protected], [email protected]
Jason L. Sanders
Affiliation:
Rudolf Peierls Centre for Theoretical Physics, Keble Road, Oxford, OX1 3NP, UK email: [email protected], [email protected]
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Abstract

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Equilibrium dynamical models are essential tools for extracting science from surveys of our Galaxy. We show how models can be tested with data from a survey before the survey's selection function has been determined. We illustrate the application of this method by presenting some results for the RAVE survey. We extend our published analytic distribution functions to include chemistry and fit the chosen functional form to a combination of the Geneva–Copenhagen survey (GCS) and a sample of G-dwarfs observed at z ~ 1.75 kpc by the SEGUE survey. By including solid dynamics we are able to predict the contribution that the thick disc/halo stars surveyed by SEGUE should make to the GCS survey. We show that the measured [Fe/H] distribution from the GCS includes many fewer stars at [Fe/H] < −0.6 than are predicted. The problem is more likely to lie in discordant abundance scales than with incorrect dynamics.

Keywords

stellar dynamicssurveysstars: abundancesGalaxy: diskGalaxy: kinematics and dynamicsGalaxy: stellar content
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S298: Setting the scene for Gaia and LAMOST , May 2013 , pp. 117 - 129
Copyright
Copyright © International Astronomical Union 2014 

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