Evolution of the Major Merger Galaxy Pair Fraction at z < 1
  We present a study of the largest available sample of near-infrared selected
(i.e., stellar mass selected) dynamically close pairs of galaxies at low
redshifts ($z<0.3$). We combine this sample with new estimates of the
major-merger pair fraction for stellar mass selected galaxies at $z<0.8$, from
the Red Sequence Cluster Survey (RCS1). We construct our low-redshift $K-$band
selected sample using photometry from the UKIRT Infrared Deep Sky Survey
(UKIDSS) and the Two Micron All Sky Survey (2MASS) in the $K-$band ($\sim
2.2~\mu$m). Combined with all available spectroscopy, our $K-$band selected
sample contains $\sim 250,000$ galaxies and is $> 90\%$ spectroscopically
complete. The depth and large volume of this sample allow us to investigate the
low-redshift pair fraction and merger rate of galaxies over a wide range in
$K-$band luminosity. We find the major-merger pair fraction to be flat at $\sim
2\%$ as a function of $K-$band luminosity for galaxies in the range $10^8 -
10^{12} L_{\odot}$, in contrast to recent results from studies in the local
group that find a substantially higher low-mass pair fraction. This
low-redshift major-merger pair fraction is $\sim 40-50\%$ higher than previous
estimates drawn from $K-$band samples, which were based on 2MASS photometry
alone. Combining with the RCS1 sample we find a much flatter evolution ($m =
0.7 \pm 0.1$), in the relation $f_{\rm{pair}} \propto (1+z)^m$, than indicated
in many previous studies. These results indicate that a typical $L\sim L^*$
galaxy has undergone $\sim 0.2-0.8$ major mergers since $z=1$ (depending on the
assumptions of merger timescale and percentage of pairs that actually merge).
