Tidal thickening of galaxy disks
Abstract
We have studied a sample of 24 edge-on interacting galaxies and compared them to edge-on isolated galaxies, to investigate the effects of tidal interaction on disk thickening. We found that the ratio h/z of the radial exponential scalelength h to the scale height z is about twice smaller for interacting galaxies. This is found to be due both to a thickening of the plane, and to a radial stripping or shrinking of the stellar disk. If we believe that any galaxy experienced a tidal interaction in the past, we must conclude that continuous gas accretion and subsequent star formation can bring back the ratio h/z to higher values, in a time scale of 1 Gyr.
Cite
@article{arxiv.astro-ph/9611234,
title = {Tidal thickening of galaxy disks},
author = {Vladimir Reshetnikov and Francoise Combes},
journal= {arXiv preprint arXiv:astro-ph/9611234},
year = {2007}
}
Comments
3 pages, including two PostScript figures, LaTeX (lamuphys.sty). To be published in the proceedings of the "Galaxy Scaling Relations: Origins, Evolution and Applications" Third ESO-VLT Workshop, November 18-20, 1996