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M2M modelling of the Galactic disc via primal: fitting to Gaia error added data

Hunt, JAS; Kawata, D; (2014) M2M modelling of the Galactic disc via primal: fitting to Gaia error added data. Monthly Notices of the Royal Astronomical Society , 443 (3) pp. 2112-2125. 10.1093/mnras/stu1306. Green open access

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Abstract

We have adapted our made-to-measure (M2M) algorithm PRIMAL to use mock Milky Way like data constructed from an N-body barred galaxy with a boxy bulge in a known dark matter potential, using M0 giant stars as tracers, with the expected error of the ESA space astrometry mission Gaia. We demonstrate the process of constructing mock Gaia data from an N-body model, including the conversion of a galactocentric Cartesian coordinate N-body model into equatorial coordinates and how to add error to it for a single stellar type. We then describe the modifications made to PRIMAL to work with observational error. This paper demonstrates that PRIMAL can recover the radial profiles of the surface density, radial velocity dispersion, vertical velocity dispersion and mean rotational velocity of the target disc, along with the pattern speed of the bar, to a reasonable degree of accuracy despite the uncertainty in the target data. In other words, the expected errors in the Gaia data are small enough for PRIMAL to recover these global properties of the disc, at least in a simplified condition, as used in this paper.

Type: Article
Title: M2M modelling of the Galactic disc via primal: fitting to Gaia error added data
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/stu1306
Publisher version: http://dx.doi.org/10.1093/mnras/stu1306
Language: English
Additional information: © 2014 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: methods: numerical, Galaxy: structure, galaxies: kinematics and dynamics, galaxies: 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/1420741
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