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The stellar kinematics of corotating spiral arms in Gaia mock observations

Hunt, JAS; Kawata, D; Grand, RJJ; Minchev, I; Pasetto, S; Cropper, M; (2015) The stellar kinematics of corotating spiral arms in Gaia mock observations. Monthly Notices of the Royal Astronomical Society , 450 (2) pp. 2132-2142. 10.1093/mnras/stv765. Green open access

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Abstract

We have observed an N-body/smoothed particle hydrodynamics simulation of a Milky Waylike barred spiral galaxy. We present a simple method that samples N-body model particles into mock Gaia stellar observations and takes into account stellar populations, dust extinction and Gaia's science performance estimates. We examine the kinematics of stars with V ≤ 16 mag around a nearby spiral arm at a similar position to the Perseus arm at three lines of sight in the disc plane; (l, b) = (90, 0), (120, 0) and (150, 0) deg. We find that the structure of the peculiar kinematics around the corotating spiral arm, which is found in Kawata et al. (2014b), is still visible in the observational data expected to be produced by Gaia, despite the dust extinction and expected observational errors of Gaia. These observable kinematic signatures will enable testing whether the Perseus arm of the Milky Way is similar to the corotating spiral arms commonly seen in N-body simulations.

Type: Article
Title: The stellar kinematics of corotating spiral arms in Gaia mock observations
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/stv765
Publisher version: https://doi.org/10.1093/mnras/stv765
Language: English
Additional information: This is the published 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/1484361
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