Panoramic View of Cosmic Frontier with Subaru

I review the progress in our systematic search for high-z Lyman alpha emitters (LAEs) with Subaru. Subaru has a vast panoramic field of view, which gives unique advantages of increasing the chance to discover the most distant galaxies, constructing a statistical sample on blank fields, and overcoming the large scale structure as well as potentially large cosmic variance in the reionization epoch. The large statistical sample of LAEs beyond z = 6 explores the initial stages of the most fundamental observables in both star. formation history and structure formation process. The LAEs also provide valuable constraints on cosmic reionization. The observed accurate Lyman alpha luminosity function of LAEs at z = 6.5 reveals an apparent deficit at least at the bright end compared to that observed at z = 5.7. The Lyman alpha luminosity density was found to gradually decrease from z = 5.7 to 7.0. These results may indicate a substantial transition in the intergalactic medium (IGM) ionizing state during these early epochs.