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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 Kodama, Yutaka 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, The SUBARU Deep Field Project: Lymanα Emitters at a Redshift of 6.6, Publications of the Astronomical Society of Japan, Volume 57, Issue 1, 25 February 2005, Pages 165–182, https://doi.org/10.1093/pasj/57.1.165
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Abstract
We present new results of a deep optical imaging survey using a narrow band filter (NB921) centered at |${\lambda = 9196 \,\mbox{Å}}$| together with |$B, V, R, i^\prime$|, and |$z^\prime$| 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 |$\mathrm{Ly}\,\alpha$| emitter candidates at |$z \approx 6.5 \hbox{--} 6.6$| among |$\sim 180$| strong NB921-excess (|$z^\prime-\mathit{NB921} \gt 1.0 z^\prime-\mathit{NB921} > 1.0$|) objects together with a color criterion of |$i^\prime-z^\prime \gt 1.3 i^\prime-z^\prime > 1.3$|. We then obtained optical spectra of 20 objects in our NB921-excess sample, and identified at least nine |$\mathrm{Ly}\,\alpha$| emitters at |$z \sim 6.5 \hbox{--} 6.6$|, including the two emitters reported by Kodaira et al. (2003, PASJ, 55, L17). Since our |$\mathrm{Ly}\,\alpha$|-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 |$\rho_\mathrm{SFR} \simeq 5.7 \times 10^{-4} \,h_{0.7} \,{{{M}_{\odot}}} \,\mathrm{yr}^{-1} \,\mathrm{Mpc}^{-3}$| at |$z \approx 6.6$|, being consistent with our previous estimate. We discuss the nature of star-formation activity in galaxies beyond |$z=6$|.
