Paper:	Panoramic View of Cosmic Frontier with Subaru
Volume:	399, Panoramic Views of Galaxy Formation and Evolution
Page:	3
Authors:	Kashikawa, N.
Abstract:	I review the progress in our systematic search for high-z Lymanα 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 Lymanα 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 Lymanα 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.

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