|
Hokkaido University Collection of Scholarly and Academic Papers >
Institute for International Collaboration >
Peer-reviewed Journal Articles, etc >
Gas and stellar spiral structures in tidally perturbed disc galaxies
| Title: | Gas and stellar spiral structures in tidally perturbed disc galaxies |
| Authors: | Pettitt, Alex R. Browse this author | | Tasker, Elizabeth J. Browse this author | | Wadsley, James W. Browse this author |
| Keywords: | hydrodynamics | | ISM: structure | | galaxies: interactions | | galaxies: kinematics and dynamics | | galaxies: spiral | | galaxies: structure |
| Issue Date: | 2-Jun-2016 |
| Publisher: | Oxford University Press |
| Journal Title: | Monthly notices of the royal astronomical society |
| Volume: | 458 |
| Issue: | 4 |
| Start Page: | 3990 |
| End Page: | 4007 |
| Publisher DOI: | 10.1093/mnras/stw588 |
| Abstract: | Tidal interactions between disc galaxies and low-mass companions are an established method for generating galactic spiral features. In this work, we present a study of the structure and dynamics of spiral arms driven in interactions between disc galaxies and perturbing companions in 3D N-body/smoothed hydrodynamical numerical simulations. Our specific aims are to characterize any differences between structures formed in the gas and stars from a purely hydrodynamical and gravitational perspective, and to find a limiting case for spiral structure generation. Through analysis of a number of different interacting cases, we find that there is very little difference between arm morphology, pitch angles and pattern speeds between the two media. The main differences are a minor offset between gas and stellar arms, clear spurring features in gaseous arms, and different radial migration of material in the stronger interacting cases. We investigate the minimum mass of a companion required to drive spiral structure in a galactic disc, finding the limiting spiral generation cases with companion masses of the order of 1 x 10(9) M-circle dot, equivalent to only 4 per cent of the stellar disc mass, or 0.5 per cent of the total galactic mass of a Milky Way analogue. |
| Rights: | This article has been accepted for publication in Monthly notices of the royal astronomical society ©:2016 doi: 10.1093/mnras/stw588 Published by Oxford University Press on behalf of The Royal Astronomical Society. All rights reserved. |
| Type: | article |
| URI: | http://hdl.handle.net/2115/62370 |
| 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)
|
Submitter: PETTITT ALEXANDER ROBERT
|
