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The Effect of Drag from the Galactic Hot Halo on the Magellanic Stream and Leading Arm

Published online by Cambridge University Press:  02 January 2013

Jonathan Diaz  and
Kenji Bekki
Jonathan Diaz*
Affiliation:
International Centre for Radio Astronomy Research, M468, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
Kenji Bekki
Affiliation:
International Centre for Radio Astronomy Research, M468, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
*
BCorresponding author. Email: jonathan.diaz@icrar.org
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Abstract

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We study the effect of drag induced by the Galactic hot halo on the two neutral hydrogen (HI) cloud complexes associated with the Large and Small Magellanic Clouds: the Magellanic Stream (MS) and the Leading Arm (LA). In particular, we adopt the numerical models of previous studies and re-simulate the tidal formation of the MS and LA with the inclusion of a drag term. We find that the drag has three effects which, although model-dependent, may bring the tidal formation scenario into better agreement with observations: correcting the LA kinematics, reproducing the MS column density gradient, and enhancing the formation of MS bifurcation. We furthermore propose a two-stage mechanism by which the bifurcation forms. In general, the inclusion of drag has a variety of both positive and negative effects on the global properties of the MS and LA, including their on-sky positions, kinematics, radial distances, and column densities. We also provide an argument which suggests that ram-pressure stripping and tidal stripping are mutually exclusive candidates for the formation of the MS and LA.

Keywords

Magellanic CloudsGalaxy: halogalaxies: kinematics and dynamicsgalaxies: evolution
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 28 , Issue 2 , 2011 , pp. 117 - 127
Copyright
Copyright © Astronomical Society of Australia 2011

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