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Bars and spirals in tidal interactions with an ensemble of galaxy mass models
| Title: | Bars and spirals in tidal interactions with an ensemble of galaxy mass models |
| Authors: | Pettitt, Alex R. Browse this author | | Wadsley, J. W. Browse this author |
| Keywords: | methods: numerical | | ISM: structure | | galaxies: interactions | | galaxies: kinematics and dynamics | | galaxies: spiral | | galaxies: structure |
| Issue Date: | 11-Mar-2018 |
| Publisher: | Oxford University Press |
| Journal Title: | Monthly notices of the royal astronomical society |
| Volume: | 474 |
| Issue: | 4 |
| Start Page: | 5645 |
| End Page: | 5671 |
| Publisher DOI: | 10.1093/mnras/stx3129 |
| Abstract: | We present simulations of the gaseous and stellar material in several different galaxy mass models under the influence of different tidal fly-bys to assess the changes in their bar and spiral morphology. Five different mass models are chosen to represent the variety of rotation curves seen in nature. We find a multitude of different spiral and bar structures can be created, with their properties dependent on the strength of the interaction. We calculate pattern speeds, spiral wind-up rates, bar lengths, and angular momentum exchange to quantify the changes in disc morphology in each scenario. The wind-up rates of the tidal spirals follow the 2:1 resonance very closely for the flat and dark matter-dominated rotation curves, whereas the more baryon-dominated curves tend to wind-up faster, influenced by their inner bars. Clear spurs are seen in most of the tidal spirals, most noticeable in the flat rotation curve models. Bars formed both in isolation and interactions agree well with those seen in real galaxies, with a mixture of ‘fast’ and ‘slow’ rotators. We find no strong correlation between bar length or pattern speed and the interaction strength. Bar formation is, however, accelerated/induced in four out of five of our models. We close by briefly comparing the morphology of our models to real galaxies, easily finding analogues for nearly all simulations presenter here, showing passages of small companions can easily reproduce an ensemble of observed morphologies. |
| Rights: | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©:2018 Alex R. Pettitt, J. W. Wadsley. Published by Oxford University Press on behalf of The Royal Astronomical Society. All rights reserved. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/68609 |
| Appears in Collections: | 国際連携機構 (Institute for International Collaboration) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: PETTITT ALEXANDER ROBERT
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