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

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

2003-06-07

arxiv.org/abs/astro-ph/0306152v1

Astronomy and Astrophysics

Astrophysics

7 pages, 5 figures, accepted for publication in PASA, High resolution version is available at http://astronomy.swin.edu.au/s

Scientific paper

10.1071/AS03028

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.

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