期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 481, 期 3, 页码 3794-3803出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty2532
关键词
Galaxy: bulge; Galaxy: disc; Galaxy: fundamental parameters; Galaxy: kinematics and dynamics; solar neighbourhood; Galaxy: structure
资金
- Dunlap Fellowship at the Dunlap Institute for Astronomy Astrophysics
- Natural Sciences and Engineering Research Council of Canada (NSERC) [RGPIN-2015-05235]
- Alfred P. Sloan Fellowship
- UK's Science & Technology Facilities Council (STFC Grant) [ST/N000811/1]
- DFG Research Centre [SFB-881]
- STFC [ST/N000811/1] Funding Source: UKRI
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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