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Gas and stellar spiral structures in tidally perturbed disc galaxies

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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
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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