The Subaru Deep Field project: Lyman α emitters at a redshift of 6.6

Yoshiaki Taniguchi, Masaru Ajiki, Tohru Nagao, Yasuhiro Shioya, Takashi Murayama, Nobunari Kashikawa, Keiichi Kodaira, Norio Kaifu, Hiroyasu Ando, Hiroshi Karoji, Masayuki Akiyama, Kentaro Aoki, Mamoru Doi, Shinobu S. Fujita, Hisanori Furusawa, Tomoki Hayashino, Fumihide Iwamuro, Masanori Iye, Naoto Kobayashi, Tadayuki KodamaYutaka Komiyama, Yuichi Matsuda, Satoshi Miyazaki, Yoshihiko Mizumoto, Tomoki Morokuma, Kentaro Motohara, Kyoji Nariai, Koji Ohta, Youichi Ohyama, Sadanori Okamura, Masami Ouchi, Toshiyuki Sasaki, Yasunori Sato, Kazuhiro Sekiguchi, Kazuhiro Shimasaku, Hajime Tamura, Masayuki Umemura, Toru Yamada, Naoki Yasuda, Michitoshi Yoshida

Research output: Contribution to journalArticle

213 Citations (Scopus)

Abstract

We present new results of a deep optical imaging survey using a narrow band filter (NB921) centered at λ = 9196 Å together with B, V, R, i′, and z′ broadband filters in the sky area of the Subaru Deep Field, which has been promoted as one of legacy programs of the 8.2m Subaru Telescope. We obtained a photometric sample of 58 Ly α emitter candidates at z ≈ 6.5-6.6 among ∼ 180 strong NB921-excess (z′ - NB921 > 1.0) objects together with a color criterion of i′ - z′ > 1.3. We then obtained optical spectra of 20 objects in our NB921-excess sample, and identified at least nine Ly α emitters at z ∼ 6.5-6.6, including the two emitters reported by Kodaira et al. (2003, PASJ, 55, L17). Since our Ly α-emitter candidates are free from strong amplification of gravitational lensing, we are able to discuss their observational properties from a statistical point of view. Based on these new results, we obtained a lower limit of the star-formation rate density of ρSFR ≃ 5.7 × 10-4 h0.7 M⊙ yr-1 Mpc-3 at z ≈ 6.6, being consistent with our previous estimate. We discuss the nature of star-formation activity in galaxies beyond z = 6.

Original languageEnglish
Pages (from-to)165-182
Number of pages18
JournalPublications of the Astronomical Society of Japan
Volume57
Issue number1
DOIs
Publication statusPublished - 2005 Jan 1

Keywords

  • Cosmology: observations
  • Early universe
  • Galaxies: evolution
  • Galaxies: formation
  • Galaxies: starburst

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Taniguchi, Y., Ajiki, M., Nagao, T., Shioya, Y., Murayama, T., Kashikawa, N., Kodaira, K., Kaifu, N., Ando, H., Karoji, H., Akiyama, M., Aoki, K., Doi, M., Fujita, S. S., Furusawa, H., Hayashino, T., Iwamuro, F., Iye, M., Kobayashi, N., ... Yoshida, M. (2005). The Subaru Deep Field project: Lyman α emitters at a redshift of 6.6. Publications of the Astronomical Society of Japan, 57(1), 165-182. https://doi.org/10.1093/pasj/57.1.165