A Magellanic Origin for the Warp of the Galaxy

Abstract

We show that a Magellanic Cloud origin for the warp of the Milky Way can explain most quantitative features of the outer HI layer recently identified by Levine, Blitz & Heiles (2005). We construct a model similar to that of Weinberg (1998) that produces distortions in the dark matter halo, and we calculate the combined effect of these dark-halo distortions and the direct tidal forcing by the Magellanic Clouds on the disk warp in the linear regime. The interaction of the dark matter halo with the disk and resonances between the orbit of the Clouds and the disk account for the large amplitudes observed for the vertical m=0,1,2 harmonics. The observations lead to six constraints on warp forcing mechanisms and our model reasonably approximates all six. The disk is shown to be very dynamic, constantly changing its shape as the Clouds proceed along their orbit. We discuss the challenges to MOND placed by the observations.

4 pages, 3 figures, submitted to ApJ Letters. Additional graphics, 3d visualizations and movies available at http://www.astro.umass.edu/~weinberg/lmc

References in corpus (10)

• A Universal Density Profile from Hierarchical Clustering
• Final Results from the Hubble Space Telescope Key Project to Measure the Hubble Constant
• The Proper Motion of the Large Magellanic Cloud using HST
• A 2MASS All-Sky View of the Sagittarius Dwarf Galaxy: III. Constraints on the Flattening of the Galactic Halo
• Local Axisymmetric Instability Criterion in the Thin, Rotating, Multicomponent Disk
• The gravitational and hydrodynamical interaction between the LMC and the Galaxy
• Warps and Cosmic Infall
• Is the dark halo of our Galaxy spherical?
• The Damping and Excitation of Galactic Warps by Dynamical Friction
• Contribution of the Large Magellanic Cloud to the Galactic Warp

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