We review results from investigations of the merging history of high-redshift faint field galaxies, with focus mostly on results from the MDS and HDF surveys. Much of the apparent increase in the fraction of peculiar galaxies with survey depth may be due to an increase in the number of tidally interacting systems. Measures of image bimodality (specifically the ``Lee Ratio'') can be used to place quantitative upper limits on the fraction of morphologically peculiar systems that are the result of ongoing or very recent major merger events. We illustrate how simulations can be used to both calibrate this technique, and also to compute ``morphological K-corrections'' which can be used estimate the fraction of apparent tidally-distorted systems that are simply undisturbed galaxies being observed in unfamiliar ultraviolet frames of reference. The results from deep imaging surveys are placed in context by comparison with recent results from imaging followups to the CFRS and LDSS spectroscopic surveys, and to results from pair-count analyses.
Galaxy Interactions at Low and High Redshift
- Pub Date:
- Invited review given at IAU symposium 186 "Galaxy Interactions at Low and High Redshifts" (Kyoto). LaTeX source, style file, and 6 figures. Four figures are embedded in the processed LaTeX file, while two big images are supplied as jpeg files