Computer Science – Numerical Analysis
Scientific paper
Jun 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...428..466h&link_type=abstract
The Astrophysical Journal, vol. 428, no. 2, pt. 1, p. 466-482
Computer Science
Numerical Analysis
36
Astronomical Models, Disk Galaxies, Evolution (Development), Galactic Structure, Kinematics, Warpage, Exponential Functions, Gravitation, Numerical Analysis, Time Dependence
Scientific paper
We have followed the time evolution of a warped galactic disk that is initially tilted with respect to an oblate halo potential. If the disk has a discrete normal mode of bending, the disk settles toward the mode shape, from the center outwards: the settled inner warp has a straight line of nodes, while the outer warp eventually twists into a leading spiral. Even if the disk as a whole has no discrete bending mode, the inner part still settles into a coherent warp without spirality. The timescale for settling may be estimated from the group velocity of bending waves; propagation times in the very outer disk exceed a Hubble time. We have run models with parameters corresponding to the observed systems NGC 4013, NGC 4565, NGC 2903, NGC 3198, and NGC 2841; just as with the discrete normal modes, comparing our time-evolving models to observed warps allows us to place constraints on the core radius and on the oblateness of the dark halo.
Hofner Peter
Sparke Linda S.
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