Cited by 108Stellar, planetary, and galactic studiesGalaxies: Formation, Evolution, PhenomenaAstrophysical Phenomena and Observations

Transient spiral structure and the disc velocity substructure in Gaia DR2

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Hunt, Jason A S, Hong, Jack, Bovy, Jo, Kawata, Daisuke, Grand, Robert J J·2018·Monthly Notices of the Royal Astronomical Society

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.

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  1. Antoja T. et al., 2018, preprint (arXiv:1804.10196) · arXiv
  2. Hattori K., Gouda N., Yano T., Sakai N., Tagawa H., Baba J., Kumamoto J., 2018, preprint (arXiv:1804.01920) · arXiv
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Authors
Hunt, J. A. S., Hong, J., Bovy, J., Kawata, D., & Grand, R. J. J.
Affiliations
  • Dunlap Institute for Astronomy and Astrophysics, University of Toronto, 50 St. George Street, Toronto, Ontario, M5S 3H4, Canada
  • University of British Columbia (CA)
  • University of Toronto (CA)
  • University College London (GB)
  • Heidelberg University (DE)
Venue
Monthly Notices of the Royal Astronomical Society
Published
2018-09-14
Volume
481
Issue
3
Pages
3794-3803
ISSN
  • 0035-8711 (ISSN-L)
  • 1365-2966
OpenAlex
W2806837809
Cited by
108
References
60
Citations by year
2026: 9 · 2025: 13 · 2024: 12 · 2023: 9 · 2022: 12 · 2021: 11 · 2020: 22 · 2019: 18 · 2018: 2
FWCI
7.13
Type
journal article
Language
en
Open access
Locations
  • Monthly Notices of the Royal Astronomical Society (publishedVersion)
  • Liverpool John Moores University (acceptedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • UCL Discovery (University College London) (submittedVersion)
  • arXiv (Cornell University)
Funders
  • Natural Sciences and Engineering Research Council of Canada (RGPIN-2015-05235)
  • Science and Technology Facilities Council (ST/N000811/1)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Astrophysical Phenomena and Observations
Keywords
Galactic disk, rotational speed, test particle model, Gaia DR2

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