The end of the reionization epoch probed by Lyα emitters at z=6.5 in the subaru deep field

被引：382

作者：

Kashikawa, Nobunari ^{[1
]}

Shimasaku, Kazuhiro

Malkan, Matthew A.

Doi, Mamoru

Matsuda, Yuichi

Ouchi, Masami

Taniguchi, Yoshiaki

Ly, Chun

Nagao, Tohru

Iye, Masanori

Motohara, Kentaro

Murayama, Takashi

Murozono, Kouji

Nariai, Kyoji

Ohta, Kouji

Okamura, Sadanori

Sasaki, Toshiyuki

Shioya, Yasuhiro

Umemura, Masayuki

机构：

[1] Natl Astron Observ, Opt & Infrared Astron Div, Mitaka, Tokyo 1818588, Japan

[2] Grad Univ Adv Studies, Sch Sci, Dept Astron, Mitaka, Tokyo 1818588, Japan

[3] Univ Tokyo, Dept Astron, Tokyo 1130033, Japan

[4] Univ Tokyo, Res Ctr Early Universe, Tokyo 1130033, Japan

[5] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[6] Univ Tokyo, Inst Astron, Mitaka, Tokyo 1818588, Japan

[7] Kyoto Univ, Grad Sch Sci, Dept Astron, Kyoto 6068502, Japan

[8] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[9] Tohoku Univ, Grad Sch Sci, Inst Astron, Aoba Ku, Sendai, Miyagi 9808578, Japan

[10] Osserv Astrofis Arcetri, INAF, I-50125 Florence, Italy

[11] Meisei Univ, Dept Phys, Hino, Tokyo 1918506, Japan

[12] Natl Astron Observ Japan, Subaru Telescope, Hilo, HI 96720 USA

[13] Univ Tsukuba, Ctr Computat Phys, Tsukuba, Ibaraki 3058571, Japan

来源：

ASTROPHYSICAL JOURNAL | 2006年 / 648卷 / 01期

关键词：

cosmology : observations; early universe; galaxies : formation; galaxies : high redshift;

D O I：

10.1086/504966

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report an extensive search for Ly 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 Ly alpha luminosity function of LAEs at z = 6.5, which reveals an apparent deficit at the bright end of similar to 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.

引用

页码：7 / 22

页数：16

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