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Spiral arm kinematics for Milky Way stellar populations

Pasetto, S; Natale, G; Kawata, D; Chiosi, C; Hunt, JAS; Brogliato, C; (2016) Spiral arm kinematics for Milky Way stellar populations. Monthly Notices of the Royal Astronomical Society , 461 (3) pp. 2383-2409. 10.1093/mnras/stw1465. Green open access

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Abstract

We present a new theoretical population synthesis model (the Galaxy Model) to examine and deal with large amounts of data from surveys of the Milky Way and to decipher the present and past structure and history of our own Galaxy. We assume the Galaxy to consist of a superposition of many composite stellar populations belonging to the thin and thick disks, the stellar halo and the bulge, and to be surrounded by a single dark matter halo component. A global model for the Milky Way's gravitational potential is built up self-consistently with the density profiles from the Poisson equation. In turn, these density profiles are used to generate synthetic probability distribution functions (PDFs) for the distribution of stars in colour-magnitude diagrams (CMDs). Finally, the gravitational potential is used to constrain the stellar kinematics by means of the moment method on a (perturbed)-distribution function. Spiral arms perturb the axisymmetric disk distribution functions in the linear response framework of density-wave theory where we present an analytical formula of the so-called `reduction factor' using Hypergeometric functions. Finally, we consider an analytical non-axisymmetric model of extinction and an algorithm based on the concept of probability distribution function to handle colour magnitude diagrams with a large number of stars. A genetic algorithm is presented to investigate both the photometric and kinematic parameter space. This galaxy model represents the natural framework to reconstruct the structure of the Milky Way from the heterogeneous data set of surveys such as Gaia-ESO, SEGUE, APOGEE2, RAVE and the Gaia mission.

Type: Article
Title: Spiral arm kinematics for Milky Way stellar populations
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/stw1465
Publisher version: http://dx.doi.org/10.1093/mnras/stw1465
Language: English
Additional information: © 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: surveys, Hertzsprung–Russell and colour-magnitude diagrams, ISM: kinematics and dynamics, Galaxy: fundamental parameters, Galaxy: kinematics and dynamics, Galaxy: structure.
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/1505268
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