The Persistence of Warps in Spiral Galaxies with Massive Halos

Details The Persistence of Warps in Spiral Galaxies with Massive Halos The Persistence of Warps in Spiral Galaxies with Massive Halos

1997-08-04

arxiv.org/abs/astro-ph/9708024v1

Astronomy and Astrophysics

Astrophysics

8 pages, 6 figures, 1 table, submitted to monthly notice on July 23, 1997

Scientific paper

10.1046/j.1365-8711.1998.01595.x

We study the persistence of warps in galactic discs in the presence of massive halos. A disc is approximated by a set of massive rings, while a halo is represented by a conventional n-body simulation. We confirm the conclusion of Nelson & Tremaine (1995) that a halo responds strongly to an embedded precessing disc. This response invalidates the approximations made by in the derivation of classical `modified tilt' modes. We show that the response of the halo causes the line of nodes of a disc that starts from a modified tilt mode to wind up within a few dynamical times. We explain this finding in terms of the probable spectrum of true normal modes of a combined disc-halo system.

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