The End of the Reionization Epoch Probed by Lyα Emitters atz= 6.5 in the Subaru Deep Field | Zendy

Nobunari Kashikawa | Zendy; Kazuhiro Shimasaku | Zendy; Matthew A. Malkan | Zendy; Mamoru Doi | Zendy; Yuichi Matsuda | Zendy; Masami Ouchi | Zendy; Yoshiaki Taniguchi | Zendy; Chun Ly | Zendy; Tohru Nagao | Zendy; Masanori Iye | Zendy; Kentaro Motohara | Zendy; Takashi Murayama | Zendy; Kouji Murozono | Zendy; Kyoji Nariai | Zendy; Kouji Ohta | Zendy; Sadanori Okamura | Zendy; Toshiyuki Sasaki | Zendy; Yasuhiro Shioya | Zendy; Masayuki Umemura | Zendy

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The End of the Reionization Epoch Probed by Lyα Emitters atz= 6.5 in the Subaru Deep Field

Author(s) -

Nobunari Kashikawa,

Kazuhiro Shimasaku,

Matthew A. Malkan,

Mamoru Doi,

Yuichi Matsuda,

Masami Ouchi,

Yoshiaki Taniguchi,

Chun Ly,

Tohru Nagao,

Masanori Iye,

Kentaro Motohara,

Takashi Murayama,

Kouji Murozono,

Kyoji Nariai,

Kouji Ohta,

Sadanori Okamura,

Toshiyuki Sasaki,

Yasuhiro Shioya,

Masayuki Umemura

Publication year - 2006

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/504966

Subject(s) - reionization , physics , astrophysics , redshift , luminosity function , luminosity , hubble deep field , universe , intergalactic medium , cosmic variance , dark ages , field (mathematics) , astronomy , galaxy , mathematics , pure mathematics

We report an extensive search for Lyman-alpha emitters (LAEs) at z=6.5 in theSubaru Deep Field. Subsequent spectroscopy with Subaru and Keck identifiedeight more LAEs, giving a total of 17 spectroscopically confirmed LAEs atz=6.5. Based on this spectroscopic sample of 17, complemented by a photometricsample of 58 LAEs, we have derived a more accurate Lyman-alpha luminosityfunction of LAEs at z=6.5, which reveals an apparent deficit at the bright endof ~0.75 mag fainter L*, compared with that observed at z=5.7. The differencein the LAE luminosity functions between z=5.7 and 6.5 is significant at the3-sigma level, which is reduced to 2-sigma when cosmic variance is taken intoaccount. This result may imply that the reionization of the universe has notbeen completed at z=6.5. We found that the spatial distribution of LAEs atz=6.5 was homogeneous over the field. We discuss the implications of theseresults for the reionization of the universe.

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