Warped and tilted galactic discs

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Abstract
Cosmic infall onto galaxies is expected to cause the net angular momentum vectors of disc galaxies to reorient each Hubble time. Well inside the optical disc we model the effect of this reorientation with a steadily slewing axisymmetric potential. Each annulus of the disc responds to the slewing by tipping about a line in the plane of the disc. The tipping angle is a steep function of radius where the disc surface density is small. We propose that both the outer warp and the nuclear inclination of the Milky Way's disc are manifestations of this effect.

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