Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-04-06
Astrophys.J.648:7-22,2006
Astronomy and Astrophysics
Astrophysics
To appear in APJ vol.648. Only minor corrections have been made. Black&White version is available at http://zone.mtk.nao.ac.
Scientific paper
10.1086/504966
We report an extensive search for Lyman-alpha emitters (LAEs) at z=6.5 in the Subaru Deep Field. Subsequent spectroscopy with Subaru and Keck identified eight more LAEs, giving a total of 17 spectroscopically confirmed LAEs at z=6.5. Based on this spectroscopic sample of 17, complemented by a photometric sample of 58 LAEs, we have derived a more accurate Lyman-alpha luminosity function of LAEs at z=6.5, which reveals an apparent deficit at the bright end of ~0.75 mag fainter L*, compared with that observed at z=5.7. The difference in the LAE luminosity functions between z=5.7 and 6.5 is significant at the 3-sigma level, which is reduced to 2-sigma when cosmic variance is taken into account. This result may imply that the reionization of the universe has not been completed at z=6.5. We found that the spatial distribution of LAEs at z=6.5 was homogeneous over the field. We discuss the implications of these results for the reionization of the universe.
Doi Makoto
Iye Masanori
Kashikawa Nobunari
Ly Chun
Malkan Matthew A.
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