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Title:
The SUBARU Deep Field Project: Lymanα Emitters at a Redshift of 6.6 [ Erratum: 2007PASJ...59..277T ]
Authors:
Taniguchi, Yoshiaki; Ajiki, Masaru; Nagao, Tohru; Shioya, Yasuhiro; Murayama, Takashi; Kashikawa, Nobunari; Kodaira, Keiichi; Kaifu, Norio; Ando, Hiroyasu; Karoji, Hiroshi; Akiyama, Masayuki; Aoki, Kentaro; Doi, Mamoru; Fujita, Shinobu S.; Furusawa, Hisanori; Hayashino, Tomoki; Iwamuro, Fumihide; Iye, Masanori; Kobayashi, Naoto; Kodama, Tadayuki; Komiyama, Yutaka; Matsuda, Yuichi; Miyazaki, Satoshi; Mizumoto, Yoshihiko; Morokuma, Tomoki; Motohara, Kentaro; Nariai, Kyoji; Ohta, Koji; Ohyama, Youichi; Okamura, Sadanori; Ouchi, Masami; Sasaki, Toshiyuki; Sato, Yasunori; Sekiguchi, Kazuhiro; Shimasaku, Kazuhiro; Tamura, Hajime; Umemura, Masayuki; Yamada, Toru; Yasuda, Naoki; Yoshida, Michitoshi
Affiliation:
AA(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578), AB(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578), AC(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578; INAF -- Osservatorio Astrofisico di Arcetri, Largo Enrico Fermi 5, 50125 Firenze, Italy), AD(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578), AE(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578), AF(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588), AG(The Graduate University for Advanced Studies, Shonan Village, Hayama, Kanagawa 240-0193), AH(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588), AI(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588), AJ(Subaru Telescope, National Astronomical Observatory of Japan, 650 N. A'ohoku Place, Hilo, HI 96720, USA), AK(Subaru Telescope, National Astronomical Observatory of Japan, 650 N. A'ohoku Place, Hilo, HI 96720, USA), AL(Subaru Telescope, National Astronomical Observatory of Japan, 650 N. A'ohoku Place, Hilo, HI 96720, USA), AM(Institute of Astronomy, Graduate School of Science, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015), AN(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578), AO(Subaru Telescope, National Astronomical Observatory of Japan, 650 N. A'ohoku Place, Hilo, HI 96720, USA), AP(Research Center for Neutrino Science, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578), AQ(Department of Astronomy, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo, Kyoto 606-8502), AR(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588), AS(Institute of Astronomy, Graduate School of Science, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015), AT(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588), AU(Subaru Telescope, National Astronomical Observatory of Japan, 650 N. A'ohoku Place, Hilo, HI 96720, USA), AV(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588; Research Center for Neutrino Science, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578), AW(Subaru Telescope, National Astronomical Observatory of Japan, 650 N. A'ohoku Place, Hilo, HI 96720, USA), AX(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588), AY(Institute of Astronomy, Graduate School of Science, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015), AZ(Institute of Astronomy, Graduate School of Science, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015), BA(Department of Physics, Meisei University, 2-1-1 Hodokubo, Hino, Tokyo 191-8506), BB(Department of Astronomy, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo, Kyoto 606-8502), BC(Subaru Telescope, National Astronomical Observatory of Japan, 650 N. A'ohoku Place, Hilo, HI 96720, USA), BD(Department of Astronomy, Graduate School of Science, The University of Tokyo, Tokyo 113-0033; Research Center for the Early Universe, Graduate School of Science, The University of Tokyo, Tokyo 113-0033), BE(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588), BF(Subaru Telescope, National Astronomical Observatory of Japan, 650 N. A'ohoku Place, Hilo, HI 96720, USA), BG(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588), BH(Subaru Telescope, National Astronomical Observatory of Japan, 650 N. A'ohoku Place, Hilo, HI 96720, USA), BI(Department of Astronomy, Graduate School of Science, The University of Tokyo, Tokyo 113-0033), BJ(Research Center for Neutrino Science, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578), BK(Center for Computational Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8571), BL(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588), BM(Institute for Cosmic Ray Research, The University of Tokyo, Kashiwa, Chiba 277-8582), BN(Okayama Astrophysical Observatory, National Astronomical Observatory, Kamogata, Okayama 719-0232)
Publication:
Publications of the Astronomical Society of Japan, Vol.57, No.1, pp. 165-182 (PASJ Homepage)
Publication Date:
02/2005
Origin:
PASJ
Keywords:
cosmology: observations, early universe, galaxies: formation, galaxies: evolution, galaxies: starburst
Bibliographic Code:
2005PASJ...57..165T

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 ȯ 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.

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