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We have performed deep imaging surveys for LyA emitters (LAEs) at redshift~7.3 in two blank fields, the Subaru Deep Field (SDF) and the Subaru/XMM-NewtonDeep survey Field (SXDF), using the Subaru/Suprime-Cam equipped with newred-sensitive CCDs and a new narrow-band filter, NB1006 (lambda_c=10052 Ang,FWHM=214 Ang). We identified four objects as LAE candidates that exhibitluminosity excess in NB1006. By carrying out deep follow-up spectroscopy forthree of them using Subaru/FOCAS and Keck/DEIMOS, a definitively asymmetricemission line is detected for one of them, SXDF-NB1006-2. Assuming this line isLyA, this object is a LAE at z=7.215 which has luminosity of 1.2^{+1.5}_{-0.6}x 10^43 [erg s-1] and a weighted skewness S_w=4.90+-0.86. Another object,SDF-NB1006-2, shows variable photometry and is thus probably a quasar (QSO) oran active galactic nucleus (AGN). It shows an asymmetric emission line at 10076Ang, which may be due to either LyA at z=7.288 or [OII] at z=1.703. The thirdobject, SDF-NB1006-1, is likely a galaxy with temporal luminosity enhancementassociated with a supernova explosion, as the brightness of this object variesbetween the observed epochs. Its spectrum does not show any emission lines. Theinferred decrease in the number density of LAEs toward higher redshift isn_LyA(z=7.3)/n_LyA(z=5.7) = 0.05^+0.11_-0.05 from z=5.7 to 7.3 down toL(LyA)=1.0 x 10^43 [erg s-1]. The present result is consistent with theinterpretation in previous studies that the neutral hydrogen fraction israpidly increasing from z=5.7 to 7.3.

The First Systematic Survey for Lyman Alpha Emitters at z=7.3 with Red-sensitive Subaru/Suprime-Cam