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Transient spiral structure and the disc velocity substructure in Gaia DR2

Hunt, JAS, Hong, J, Bovy, J, Kawata, D and 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. ISSN 0035-8711

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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.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2018 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical and Space Sciences; Astronomy & Astrophysics
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press (OUP)
SWORD Depositor: A Symplectic
Date Deposited: 19 Apr 2023 11:34
Last Modified: 19 Apr 2023 11:34
DOI or ID number: 10.1093/mnras/sty2532
URI: https://researchonline.ljmu.ac.uk/id/eprint/19331
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