Spectroscopic obs. of LAEs at z~3.1 in SXDS field

Significant overdense and underdense regions are detected in our sample, but the area coverage is wide enough to largely suppress the effect from such cosmic variance. Our Ly{alpha} LF is generally consistent with those from previous studies at z~3.1. At the brightest end of the LF, there is a tentative detection of a density excess that is not well described by the Schechter function.

The comparison with the LFs at other redshifts suggests that the Ly{alpha} LF does not show significant evolution at 2<z<5. Finally, we build the composite spectra of the LAEs and detect the NV{lambda}1239 and CIV{lambda}{lambda}1548,1551 doublet emission lines at significance of ~4{sigma}, suggesting very hard radiation fields in (some of) these LAEs.