A New High-Redshift Lyman alpha Emitter: Possible Superwind Galaxy at z   = 5.69
  During the course of our deep optical imaging survey for Ly alpha emitters at z approximately 5.7 in the field around the z=5.74 quasar SDSSp J104433.04-012502.2, we have found a candidate strong emission-line source. Follow-up optical spectroscopy shows that the emission line profile of this object is asymmetric, showing excess red-wing emission. These properties are consistent with an identification of Ly alpha emission at a redshift of z=5.687 +/- 0.002. The observed broad line width, Delta V_{FWHM} ~= 340 km s^{-1} and excess red-wing emission also suggest that this object hosts a galactic superwind. 
M. Ajiki, Y. Taniguchi, T. Murayama, T. Nagao, S. Veilleux, Y. Shioya,   S.S. Fujita, Y. Kakazu, Y. Komiyama, S. Okamura, D....