Galaxies at Redshifts z > 5
  Here we describe our attempts to establish statistically complete samples of very high redshift galaxies by obtaining photometric redshifts of galaxies in Medium Deep Survey (MDS) fields and photometric and spectroscopic redshifts of galaxies in very deep STIS slitless spectroscopy fields. On the basis of this analysis, we have identified galaxies of redshift z = 4.92 in an MDS field and of redshift z = 6.68 in a very deep STIS field. 
Kenneth M. Lanzetta, Hsiao-Wen Chen, Sebastian Pascarelle, & Noriaki   Yahata