Sormani, MC;
Sobacchi, E;
Sanders, JL;
(2024)
Nuclear rings are the inner edge of a gap around the Lindblad Resonance.
Monthly Notices of the Royal Astronomical Society
, 528
(4)
pp. 5742-5762.
10.1093/mnras/stae082.
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Abstract
Gaseous nuclear rings are large-scale coherent structures commonly found at the centres of barred galaxies. We propose that they are an accumulation of gas at the inner edge of an extensive gap that forms around the Inner Lindblad Resonance (ILR). The gap initially opens because the bar potential excites strong trailing waves near the ILR, which remove angular momentum from the gas disc and transport the gas inwards. The gap then widens because the bar potential continuously excites trailing waves at the inner edge of the gap, which remove further angular momentum, moving the edge further inwards until it stops at a distance of several wavelengths from the ILR. The gas accumulating at the inner edge of the gap forms the nuclear ring. The speed at which the gap edge moves and its final distance from the ILR strongly depend on the sound speed, explaining the puzzling dependence of the nuclear ring radius on the sound speed in simulations.
| Type: | Article |
|---|---|
| Title: | Nuclear rings are the inner edge of a gap around the Lindblad Resonance |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stae082 |
| Publisher version: | http://dx.doi.org/10.1093/mnras/stae082 |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third-party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| Keywords: | galaxies: bulges, galaxies: kinematics and dynamics, galaxies: ISM |
| 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 Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10188875 |
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