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

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

doi:10.1086/504966

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

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

SCI - Astronomy

Research output: Contribution to journal › Article › peer-review

351 Citations (Scopus)

Abstract

We report an extensive search for Lyα 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 Lyα 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 σ level, which is reduced to 2 σ 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.

Original language	English
Pages (from-to)	7-22
Number of pages	16
Journal	Astrophysical Journal
Volume	648
Issue number	1 I
DOIs	https://doi.org/10.1086/504966
Publication status	Published - 2006 Sept 1

Keywords

Cosmology: observations
Early universe
Galaxies: formation
Galaxies: high-redshift

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Kashikawa, N., Shimasaku, K., Malkan, M. A., Doi, M., Matsuda, Y., Ouchi, M., Taniguchi, Y., Ly, C., Nagao, T., Iye, M., Motohara, K., Murayama, T., Murozono, K., Nariai, K., Ohta, K., Okamura, S., Sasaki, T., Shioya, Y., & Umemura, M. (2006). The end of the reionization epoch probed by Lyα emitters at z = 6.5 in the subaru deep field. Astrophysical Journal, 648(1 I), 7-22. https://doi.org/10.1086/504966

@article{6970254c4ef24fae8eccb53690487497,

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

abstract = "We report an extensive search for Lyα 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 Lyα 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 σ level, which is reduced to 2 σ 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.",

keywords = "Cosmology: observations, Early universe, Galaxies: formation, Galaxies: high-redshift",

author = "Nobunari Kashikawa and Kazuhiro Shimasaku and Malkan, {Matthew A.} and Mamoru Doi and Yuichi Matsuda and Masami Ouchi and Yoshiaki Taniguchi and Chun Ly and Tohru Nagao and Masanori Iye and Kentaro Motohara and Takashi Murayama and Kouji Murozono and Kyoji Nariai and Kouji Ohta and Sadanori Okamura and Toshiyuki Sasaki and Yasuhiro Shioya and Masayuki Umemura",

year = "2006",

month = sep,

day = "1",

doi = "10.1086/504966",

language = "English",

volume = "648",

pages = "7--22",

journal = "Astrophysical Journal",

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Kashikawa, N, Shimasaku, K, Malkan, MA, Doi, M, Matsuda, Y, Ouchi, M, Taniguchi, Y, Ly, C, Nagao, T, Iye, M, Motohara, K, Murayama, T, Murozono, K, Nariai, K, Ohta, K, Okamura, S, Sasaki, T, Shioya, Y & Umemura, M 2006, 'The end of the reionization epoch probed by Lyα emitters at z = 6.5 in the subaru deep field', Astrophysical Journal, vol. 648, no. 1 I, pp. 7-22. https://doi.org/10.1086/504966

TY - JOUR

T1 - The end of the reionization epoch probed by Lyα emitters at z = 6.5 in the subaru deep field

AU - Kashikawa, Nobunari

AU - Shimasaku, Kazuhiro

AU - Malkan, Matthew A.

AU - Doi, Mamoru

AU - Matsuda, Yuichi

AU - Ouchi, Masami

AU - Taniguchi, Yoshiaki

AU - Ly, Chun

AU - Nagao, Tohru

AU - Iye, Masanori

AU - Motohara, Kentaro

AU - Murayama, Takashi

AU - Murozono, Kouji

AU - Nariai, Kyoji

AU - Ohta, Kouji

AU - Okamura, Sadanori

AU - Sasaki, Toshiyuki

AU - Shioya, Yasuhiro

AU - Umemura, Masayuki

PY - 2006/9/1

Y1 - 2006/9/1

N2 - We report an extensive search for Lyα 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 Lyα 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 σ level, which is reduced to 2 σ 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.

AB - We report an extensive search for Lyα 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 Lyα 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 σ level, which is reduced to 2 σ 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.

KW - Cosmology: observations

KW - Early universe

KW - Galaxies: formation

KW - Galaxies: high-redshift

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U2 - 10.1086/504966

DO - 10.1086/504966

M3 - Article

AN - SCOPUS:33748804931

SN - 0004-637X

VL - 648

SP - 7

EP - 22

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 I

ER -

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

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