Kawata, D;
Baba, J;
Hunt, JAS;
Schönrich, R;
Ciucǎ, I;
Friske, J;
Seabroke, G;
(2021)
Galactic Bar Resonances Inferred from Kinematically Hot Stars in Gaia EDR3.
Monthly Notices of the Royal Astronomical Society
, 508
(1)
pp. 728-736.
10.1093/mnras/stab2582.
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Abstract
Using a numerical simulation of an isolated barred disc galaxy, we first demonstrate that the resonances of the inner bar structure induce more prominent features in the action space distribution for the kinematically hotter stars, which are less sensitive to the local perturbation, such as the transient spiral arms. Then, we analyse the action distribution for the kinematically hotter stars selected from the Gaia EDR3 data as the stars with higher values of radial and vertical actions. We find several resonance features, including two new features, in the angular momentum distribution similar to what are seen in our numerical simulations. We show that the bar pattern speeds of about Ωbar ∼ 34 and 42 km s−1 kpc−1 explain all these features equally well. The resonance features we find correspond to the inner 4:1, co-rotation (CR), outer 4:1, outer Lindblad, and outer 4:3 (CR, outer 4:1, outer Lindblad, outer 4:3, and outer 1:1) resonances, when Ωbar ∼ 34 (42) km s−1 kpc−1 is assumed.
| Type: | Article |
|---|---|
| Title: | Galactic Bar Resonances Inferred from Kinematically Hot Stars in Gaia EDR3 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stab2582 |
| Publisher version: | http://dx.doi.org/10.1093/mnras/stab2582 |
| Language: | English |
| Additional information: | © 2021 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | Galaxy: disc, Galaxy: evolution, 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/10135347 |
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