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The properties of the local spiral arms from RAVE data: two-dimensional density wave approach

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. Green open access

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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.ucl.ac.uk/id/eprint/10090608
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