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A redshift sample of 545 field galaxies is used to examine how the galaxymerger rate changes with redshift, and how mergers affect the observedproperties of galaxies in close pairs. Close pairs are defined as those withprojected separations less than 20 h^{-1} kpc. At a mean redshift of 0.33, itis found that 7.1 +/- 1.4 % of galaxies are in close physical pairs, comparedto 4.3 +/- 0.4 % locally. The merger rate is estimated to change with redshiftas (1+z)^{2.8 +/- 0.9}. These results are shown to be consistent with previousclose pair studies, and provide one of the strongest constraints to date on theredshift dependence of the merger rate.  As with earlier studies, no significant differences between the meanproperties of paired and isolated galaxies are detected. However, using thesubset of confirmed close physical pairs, those which appear to be undergoinginteractions or mergers (based on their images) are found to have galaxies withstrong emission lines and very blue rest-frame colors. In addition, these pairshave low relative velocities, increasing the likelihood that the galaxies willmerge. We interpret this as the first clear evidence of merger-induced starformation occurring in field galaxies at this redshift.Comment: Accepted for publication in the Astrophysical Journal. LaTeX, 37  pages of text, 4 pages of tables (landscape mode), 11 figures. Also available  via anonymous ftp (ftp://astroftp.phys.uvic.ca/pub/patton/pairs/

Close Pairs of Field Galaxies in the CNOC1 Redshift Survey