Binney, J;
Schönrich, R;
(2018)
The origin of the Gaia phase-plane spiral.
Monthly Notices of the Royal Astronomical Society
, 481
(2)
pp. 1501-1506.
10.1093/MNRAS/STY2378.
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Abstract
A simple model is presented of the formation of the spiral in the (z, vz) phase plane of solar-neighbourhood stars thatwas recently discovered in Gaia data. The key is that the frequency Ωz at which stars oscillate vertically depends on angular momentum about the z-axis in addition to the amplitude of the star's vertical oscillations. Spirals should form in both 〈vϕ〉 and 〈vR〉 whenever a massive substructure, such as the Sgr dwarf galaxy, passes through the Galactic plane. The model yields similar spirals to those observed in both 〈vϕ〉 and 〈vR〉. The primary driver is the component of the tidal force that lies in the plane. We investigate the longevity of the spirals and the mass of the substructure, but the approximations inherent in the model make quantitative results unreliable. The work relies heavily on a self-consistent, multicomponent model of our Galaxy produced by the AGAMA package for f(J) modelling.
| Type: | Article |
|---|---|
| Title: | The origin of the Gaia phase-plane spiral |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/MNRAS/STY2378 |
| Publisher version: | https://doi.org/10.1093/mnras/sty2378 |
| 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: | methods: numerical, Galaxy: kinematics and dynamics, galaxies: kinematics and dynamics |
| 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/10083336 |
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