A survey of NB921 dropouts in the Subaru Deep Field
  In order to search for high-redshift galaxies beyond $z = 6.6$ in the Subaru Deep Field, we have investigated NB921-dropout galaxies where NB921 is the narrowband filter centered at 919.6 nm with FWHM of 13.2 nm for the Suprime-Cam on the Subaru Telescope. There are no secure NB921-dropout candidates brighter than $z^\prime = 25.5$. Based on this result, we discuss the UV luminosity function of star-forming galaxies at $z > 6.6$. 
Yasuhiro Shioya, Yoshiaki Taniguchi, Masaru Ajiki, Tohru Nagao,   Takashi Murayama, Shunji S. Sasaki, Ryoko Sumiya, Yuichiro...