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Transient spiral structure and the disc velocity substructure in Gaia DR2

Hunt, JAS; Hong, J; Bovy, J; Kawata, D; Grand, RJJ; (2018) Transient spiral structure and the disc velocity substructure in Gaia DR2. Monthly Notices of the Royal Astronomical Society , 481 (3) pp. 3794-3803. 10.1093/mnras/sty2532. Green open access

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Abstract

The second data release from ESA’s Gaia mission has revealed many ridge-like structures in the velocity distribution of the Milky Way. We show that these can arise naturally from winding transient spiral structure that is commonly seen in N-body simulations of disc galaxies. We construct test particle models of the winding spiral structure, and compare the resulting distribution of orbits with the observed two-dimensional velocity distribution in the extended solar neighbourhood and with the distribution of rotational velocities over 8 kpc along the Sun–Galactic-centre–Galactic anticentre line. We show that the ridges in these observations are well reproduced by the winding spiral model. Additionally, we demonstrate that the transient winding spiral potential can create a Hercules-like feature in the kinematics of the solar neighbourhood, either alone, or in combination with a long-slow bar potential.

Type: Article
Title: Transient spiral structure and the disc velocity substructure in Gaia DR2
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/sty2532
Publisher version: https://doi.org/10.1093/mnras/sty2532
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Galaxy: bulge, Galaxy: disc, Galaxy: fundamental parameters, Galaxy: kinematics and dynamics, solar neighbourhood, 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/10063882
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