Aluzas, R, Pittard, JM, Falle, SAEG et al. (1 more author) (2014) Numerical simulations of a shock interacting with multiple magnetized clouds. Monthly Notices of the Royal Astronomical Society, 444 (1). 971 - 993. ISSN 0035-8711
Abstract
We present 2D adiabatic magnetohydrodynamic simulations of a shock interacting with groups of two or three cylindrical clouds. We study how the presence of a nearby cloud influences the dynamics of this interaction, and explore the resulting differences and similarities in the evolution of each cloud. The understanding gained from this small-scale study will help to interpret the behaviour of systems with many 10s or 100s of clouds.We observe a wide variety of behaviour in the interactions studied, which is dependent on the initial positions of the clouds and the orientation and strength of the magnetic field. We find (i) some clouds are stretched along their field lines, whereas others are confined by their field lines; (ii) upstream clouds may accelerate past downstream clouds (though magnetic tension can prevent this); (iii) clouds may also change their relative positions transverse to the direction of shock propagation as they 'slingshot' past each other; (iv) downstream clouds may be offered some protection from the oncoming flow as a result of being in the lee of an upstream cloud; (v) the cycle of cloud compression and re-expansion is generally weaker when there are nearby neighbouring clouds; (vi) the plasma β in cloud material can vary rapidly as clouds collide with one another, but low values of β are always transitory. This work is relevant to studies of multiphase regions, where fast, low-density gas interacts with dense clouds, such as in circumstellar bubbles, supernova remnants, superbubbles and galactic winds.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and 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. |
Keywords: | Hydrodynamics; ISM: clouds; ISM: kinematics and dynamics; ISM: supernova remnants; shock waves; turbulence |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Mathematics (Leeds) > Applied Mathematics (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 22 Jan 2015 11:12 |
Last Modified: | 16 Jan 2018 23:48 |
Published Version: | http://dx.doi.org/10.1093/mnras/stu1501 |
Status: | Published |
Publisher: | Oxford University Press |
Identification Number: | 10.1093/mnras/stu1501 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:82593 |