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.
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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 |
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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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