Siebert, A;
Famaey, B;
Binney, J;
Burnett, B;
Faure, C;
Minchev, I;
Williams, MEK;
... Zwitter, T; + view all
(2012)
The properties of the local spiral arms from RAVE data: two-dimensional density wave approach.
Monthly Notices of the Royal Astronomical Society
, 425
(3)
pp. 2335-2342.
10.1111/j.1365-2966.2012.21638.x.
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Abstract
Using the Radial Velocity Experiment (RAVE) survey, we recently brought to light a gradient in the mean galactocentric radial velocity of stars in the extended solar neighbourhood. This gradient likely originates from non-axisymmetric perturbations of the potential, among which a perturbation by spiral arms is a possible explanation. Here, we apply the traditional density wave theory and analytically model the radial component of the two-dimensional velocity field. Provided that the radial velocity gradient is caused by relatively long-lived spiral arms that can affect stars substantially above the plane, this analytic model provides new independent estimates for the parameters of the Milky Way spiral structure. Our analysis favours a two-armed perturbation with the Sun close to the inner ultra-harmonic 4:1 resonance, with a pattern speed graphic and a small amplitude graphic per cent of the background potential (14 per cent of the background density). This model can serve as a basis for numerical simulations in three dimensions, additionally including a possible influence of the Galactic bar and/or other non-axisymmetric modes.
| Type: | Article |
|---|---|
| Title: | The properties of the local spiral arms from RAVE data: two-dimensional density wave approach |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1111/j.1365-2966.2012.21638.x |
| Publisher version: | https://doi.org/10.1111/j.1365-2966.2012.21638.x |
| 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: | stars: kinematics and dynamics, Galaxy: fundamental parameters, Galaxy: 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-pp.ucl.ac.uk/id/eprint/10090608 |
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