The WiggleZ Dark Energy Survey: Final Data Release and the Metallicity
  of UV-Luminous Galaxies
  The WiggleZ Dark Energy Survey measured the redshifts of over 200,000
UV-selected (NUV<22.8 mag) galaxies on the Anglo-Australian Telescope. The
survey detected the baryon acoustic oscillation signal in the large scale
distribution of galaxies over the redshift range 0.2<z<1.0, confirming the
acceleration of the expansion of the Universe and measuring the rate of
structure growth within it. Here we present the final data release of the
survey: a catalogue of 225415 galaxies and individual files of the galaxy
spectra. We analyse the emission-line properties of these UV-luminous
Lyman-break galaxies by stacking the spectra in bins of luminosity, redshift,
and stellar mass. The most luminous (-25 mag < MFUV <-22 mag) galaxies have
very broad H-beta emission from active nuclei, as well as a broad second
component to the [OIII] (495.9 nm, 500.7 nm) doublet lines that is blue shifted
by 100 km/s, indicating the presence of gas outflows in these galaxies. The
composite spectra allow us to detect and measure the temperature-sensitive
[OIII] (436.3 nm) line and obtain metallicities using the direct method. The
metallicities of intermediate stellar mass (8.8<log(M*/Msun)<10) WiggleZ
galaxies are consistent with normal emission-line galaxies at the same masses.
In contrast, the metallicities of high stellar mass (10<log(M*/Msun)<12)
WiggleZ galaxies are significantly lower than for normal emission-line galaxies
at the same masses. This is not an effect of evolution as the metallicities do
not vary with redshift; it is most likely a property specific to the extremely
UV-luminous WiggleZ galaxies.
