Response of a disk galaxy to tidal interactions : Onset of warps and scalloping

Details Response of a disk galaxy to tidal interactions : Onset of warps and scalloping Response of a disk galaxy to tidal interactions : Onset of warps and scalloping

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...20925102s&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #251.02; Bulletin of the American Astronomical Society,

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Response of a disk galaxy to tidal interaction is potentially important in studying various interesting disk phenomena e.g. warps, scalloping, small scale corrugations etc. We calculate the self-consistent linear response of a disk galaxy under tidal interaction and show that the disk response opposes the tidal perturbations in general scenario. We show that, in particular for the m=1 azimuthal wavenumber of the Fourier decomposed tidal perturbation, the disk resists upto a radius that spans a range of 4 - 6 disk scale-lengths - so that the disk shows a net warp (m=1) beyond this regime. This has physically explained for the first time the well-known but so far unexplained observation that warps start beyond this radii (Briggs rule). We also study other interesting feature called scalloping (m=10) and explain why scalloping is seen around 30 kpc in the Milky Way.
Future work is focused on a detailed comparison of the warp-starting radii between the observations and theory on a sample of edge-on galaxies showing clear signs of warping in the deep Spitzer 3.5 - 8 micron observations. Financial support for K.S. was supported by a Graduate Student DDRF grant of the Space Telescope Science Institute

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