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Cloud angular momentum and effective viscosity in global SPH simulations with feedback

Williamson, David J.; Thacker, Robert J.; Wurster, James; Gibson, Brad K.


David J. Williamson

Robert J. Thacker

James Wurster

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Professor Brad Gibson
Head of Dept, Physics & Maths; Director, E.A. Milne Centre for Astrophysics


We examine simulations of isolated galaxies to analyse the effects of localized feedback on the formation and evolution of molecular clouds. Feedback contributes to turbulence and the destruction of clouds, leading to a population of clouds that is younger, less massive, and with more retrograde rotation. We investigate the evolution of clouds as they interact with each other and the diffuse interstellar medium, and determine that the role of cloud interactions differs strongly with the presence of feedback: in models without feedback, scattering events dramatically increase the retrograde fraction, but in models with feedback, mergers between clouds may slightly increase the prograde fraction. We also produce an estimate of the viscous time-scale due to cloud-cloud collisions, which increases with increasing strength of feedback (t$_{ν}$ {̃} 20 Gyr versus t$_{ν}$ {̃} 10 Gyr), but is still much smaller than previous estimates (t$_{ν}$ {̃} 1000 Gyr); although collisions become more frequent with feedback, less energy is lost in each collision than in the models without feedback.


Williamson, D. J., Thacker, R. J., Wurster, J., & Gibson, B. K. (2014). Cloud angular momentum and effective viscosity in global SPH simulations with feedback. Monthly notices of the Royal Astronomical Society, 442(4), 3674-3685.

Journal Article Type Article
Acceptance Date Jun 3, 2014
Online Publication Date Jul 3, 2014
Publication Date Jan 1, 2014
Deposit Date Apr 13, 2016
Publicly Available Date Apr 13, 2016
Journal Monthly notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 442
Issue 4
Pages 3674-3685
Keywords Space and Planetary Science; Astronomy and Astrophysics
Public URL
Publisher URL
Additional Information This article has been accepted for publication in Monthly notices of the Royal Astronomical Society ©: 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.


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