  We present the results of a study of a large sample of luminous (z'{AB}<26)
Lyman break galaxies (LBGs) in the redshift interval 4.7<z<6.3, selected from a
contiguous 0.63 square degree area covered by the UKIDSS Ultra Deep Survey
(UDS) and the Subaru XMM-Newton Survey (SXDS). Utilising the large area
coverage and the excellent available optical+nearIR data, we use a photometric
redshift analysis to derive a new, robust, measurement of the bright end (L>L*)
of the UV-selected luminosity function at high redshift. When combined with
literature studies of the fainter LBG population, our new sample provides
improved constraints on the luminosity function of redshift 5<z<6 LBGs over the
luminosity range 0.1L*<L<10L*. A maximum likelihood analysis returns
best-fitting Schechter function parameters of M*_1500=-20.73, phi*=0.0009
Mpc^-3 and alpha=-1.66 for the luminosity function at z=5, and M*_1500 =
-20.04, phi*=0.0018 Mpc^-3 and alpha=-1.71 at z=6. In addition, an analysis of
the angular clustering properties of our LBG sample demonstrates that luminous
5<z<6 LBGs are strongly clustered (r_0 = 8.1 Mpc), and are consistent with the
occupation of dark matter halos with masses of ~10^{11.5-12.0} Msun. Moreover,
by stacking the available multi-wavelength imaging data for the high-redshift
LBGs it is possible to place useful constraints on their typical stellar mass.
The results of this analysis suggest that luminous LBGs at 5<z<6 have an
average stellar mass of ~10^10 Msun, consistent with the results of the
clustering analysis assuming plausible values for the ratio of stellar to dark
matter. Finally, by combining our luminosity function results with those of the
stacking analysis we derive estimates of ~1x10^7 Msun Mpc^-3 and 4x10^6 Msun
Mpc^-3 for the stellar mass density at z~5 and z~6 respectively.
