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We study the evolution of galaxy populations around the spectroscopic WiggleZsample of starforming galaxies at 0.25 < z < 0.75 using the photometric catalogfrom the Second Red-Sequence Cluster Survey (RCS2). We probe the opticalphotometric properties of the net excess neighbor galaxies. The key concept isthat the marker galaxies and their neighbors are located at the same redshift,providing a sample of galaxies representing a complete census of galaxies inthe neighborhood of star-forming galaxies. The results are compared with thoseusing the RCS WiggleZ Spare-Fibre (RCS-WSF) sample as markers, representinggalaxies in cluster environments at 0.25 < z < 0.45. By analyzing the stackedcolor-color properties of the WiggleZ neighbor galaxies, we find that theiroptical colors are not a strong function of indicators of star-formingactivities such as EW([OII]) or GALEX NUV luminoisty of the markers. Thegalaxies around the WiggleZ markers exhibit a bimodal distribution on thecolor-magnitude diagram, with most of them located in the blue cloud. Theoptical galaxy luminosity functions (GLF) of the blue neighbor galaxies have afaint-end slope \alpha of \sim -1.3, similar to that for galaxies in clusterenvironments drawn from the RCS-WSF sample. The faint-end slope of the GLF forthe red neighbors, however, is \sim -0.4, significantly shallower than the \sim-0.7 found for those in cluster environments. This suggests that the build-upof the faint-end of the red sequence in cluster environments is in asignificantly more advanced stage than that in the star-forming and lowergalaxy density WiggleZ neighborhoods. We find that the red galaxy fraction(fred) around the star-forming WiggleZ galaxies has similar values from z \sim0.3 to z \sim 0.6 with fred \sim 0.28, but drops to fred \sim 0.20 at z >\sim0.7. This change of fred with redshift suggests that (and more...)

The WiggleZ Dark Energy Survey: Galaxy Evolution at 0.25 < z < 0.75 Using The Second Red-Sequence Cluster Survey (RCS-2)