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Is High-Velocity Cloud Complex C Associated with the Galactic Warp?

Published online by Cambridge University Press:  05 March 2013

Daisuke Kawata ,
Christopher Thom  and
Brad K. Gibson
Daisuke Kawata
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University, Mail #31, PO Box 218, Hawthorn, Vic 3122, Australia; dkawata@astro.swin.edu.au
Christopher Thom
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University, Mail #31, PO Box 218, Hawthorn, Vic 3122, Australia; cthom@astro.swin.edu.au
Brad K. Gibson
Affiliation:
Centre for Astrophysics and Supercomputing, Swinburne University, Mail #31, PO Box 218, Hawthorn, Vic 3122, Australia; bgibson@astro.swin.edu.au
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Abstract

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We test the hypothesis that high-velocity gas cloud Complex C is actually a high-latitude spiral arm extension in the direction of the Galactic warp, as opposed to the standard interpretation — that of a once extragalactic, but now infalling, gas cloud. A parallel Tree N-body code was employed to simulate the tidal interaction of a satellite perturber with the Milky Way. We find that a model incorporating a perturber of the mass of the Large Magellanic Cloud on a south to north polar orbit, crossing the disk at ˜15 kpc, does yield a high-velocity, high-latitude extension consistent with the spatial, kinematical, and column density properties of Complex C. Unless this massive satellite remains undiscovered because of either a fortuitous alignment with the Galactic bulge (feasible within the framework of the model), or the lack of any associated baryonic component, we conclude that this alternative interpretation appears unlikely.

Keywords

ISM: cloudsGalaxy: kinematics and dynamicsmethods: N-body simulations
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 20 , Issue 3 , 2003 , pp. 263 - 269
Copyright
Copyright © Astronomical Society of Australia 2003

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