The Effect of Drag from the Galactic Hot Halo on the Magellanic Stream and Leading Arm
Jonathan Diaz A B and Kenji Bekki AA International Centre for Radio Astronomy Research, M468, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia
B Corresponding author. Email: jonathan.diaz@icrar.org
Publications of the Astronomical Society of Australia 28(2) 117-127 https://doi.org/10.1071/AS10044
Submitted: 23 November 10 Accepted: 01 March 11 Published: 16 June 2011
Abstract
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 Clouds — Galaxy: halo — galaxies: kinematics and dynamics — galaxies: evolution
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