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Title:
A Strong Lyα Emitter at z = 6.33 in the Subaru Deep Field Selected as an i'-Dropout
Authors:
Nagao, T.; Taniguchi, Y.; Kashikawa, N.; Kodaira, K.; Kaifu, N.; Ando, H.; Karoji, H.; Ajiki, M.; Akiyama, M.; Aoki, K.; Doi, M.; Fujita, S. S.; Furusawa, H.; Hayashino, T.; Iwamuro, F.; Iye, M.; Kobayashi, N.; Kodama, T.; Komiyama, Y.; Matsuda, Y.; Miyazaki, S.; Mizumoto, Y.; Morokuma, T.; Motohara, K.; Murayama, T.; Nariai, K.; Ohta, K.; Okamura, S.; Ouchi, M.; Sasaki, T.; Sato, Y.; Sekiguchi, K.; Shimasaku, K.; Shioya, Y.; Tamura, H.; Tanaka, I.; Umemura, M.; Yamada, T.; Yasuda, N.; Yoshida, M.
Affiliation:
AA(INAF-Osservatorio Astrofisico di Arcetri, Largo Enrico Fermi 5, I-50125 Florence, Italy; .; Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan.), AB(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan.), AC(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan.), AD(Graduate University for Advanced Studies, Shonan Village, Hayama, Kanagawa 240-0193, Japan.), AE(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan.), AF(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan.), AG(Subaru Telescope, National Astronomical Observatory of Japan, 650 North A'ohoku Place, Hilo, HI 96720.), AH(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan.), AI(Subaru Telescope, National Astronomical Observatory of Japan, 650 North A'ohoku Place, Hilo, HI 96720.), AJ(Subaru Telescope, National Astronomical Observatory of Japan, 650 North A'ohoku Place, Hilo, HI 96720.), AK(Institute of Astronomy, Graduate School of Science, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan.), AL(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan.), AM(Subaru Telescope, National Astronomical Observatory of Japan, 650 North A'ohoku Place, Hilo, HI 96720.), AN(Research Center for Neutrino Science, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan.), AO(Department of Astronomy, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo, Kyoto 606-8502, Japan.), AP(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan.), AQ(Institute of Astronomy, Graduate School of Science, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan.), AR(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan.), AS(Subaru Telescope, National Astronomical Observatory of Japan, 650 North A'ohoku Place, Hilo, HI 96720.), AT(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan.; Research Center for Neutrino Science, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan.), AU(Subaru Telescope, National Astronomical Observatory of Japan, 650 North A'ohoku Place, Hilo, HI 96720.), AV(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan.), AW(Institute of Astronomy, Graduate School of Science, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan.), AX(Institute of Astronomy, Graduate School of Science, University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan.), AY(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan.), AZ(Department of Physics, Meisei University, 2-1-1 Hodokubo, Hino, Tokyo 191-8506, Japan.), BA(Department of Astronomy, Graduate School of Science, Kyoto University, Kitashirakawa, Sakyo, Kyoto 606-8502, Japan.), BB(Department of Astronomy, Graduate School of Science, University of Tokyo, Tokyo 113-0033, Japan.; Research Center for the Early Universe, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.), BC(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan.), BD(Subaru Telescope, National Astronomical Observatory of Japan, 650 North A'ohoku Place, Hilo, HI 96720.), BE(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan.), BF(Subaru Telescope, National Astronomical Observatory of Japan, 650 North A'ohoku Place, Hilo, HI 96720.), BG(Department of Astronomy, Graduate School of Science, University of Tokyo, Tokyo 113-0033, Japan.), BH(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan.), BI(Research Center for Neutrino Science, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan.), BJ(Astronomical Institute, Graduate School of Science, Tohoku University, Aramaki, Aoba, Sendai 980-8578, Japan.), BK(Center for Computational Physics, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8571, Japan.), BL(National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan.), BM(Institute for Cosmic Ray Research, University of Tokyo, 5-1-5 Kashiwa-no-Ha, Kashiwa City, Chiba 277-8582, Japan.), BN(Department of Astronomy, Graduate School of Science, University of Tokyo, Tokyo 113-0033, Japan.)
Publication:
The Astrophysical Journal, Volume 613, Issue 1, pp. L9-L12. (ApJL Homepage)
Publication Date:
09/2004
Origin:
UCP
ApJ Keywords:
Cosmology: Early Universe, Galaxies: Evolution, Galaxies: Formation, Galaxies: Individual: Alphanumeric: SDF J132440.6+273607, Galaxies: Starburst
DOI:
10.1086/424965
Bibliographic Code:
2004ApJ...613L...9N

Abstract

We report on the discovery of a star-forming galaxy at z=6.33 in the Subaru Deep Field. This object is selected as a candidate of an i'-dropout high-redshift galaxy around z=6 because of its red i'-z' color in our deep optical imaging survey in the Subaru Deep Field. Our follow-up optical spectroscopy reveals that this object is a strong Lyα emitter with only very faint ultraviolet continuum. The rest-frame equivalent width of the detected Lyα emission is as much as 130 Å. Thus the light detected in our z' image is largely attributed to the Lyα emission, i.e., ~40% of the z'-band flux is the strong Lyα emission, giving a very red i'-z' color. This is consistent with the photometric property of this object because the narrowband data obtained with the NB921 filter show a significant depression, z'-NB921=-0.54 mag. By using the photometric data, we show that some other objects among the 48 i'-dropout high-redshift galaxy candidates found in the Subaru Deep Field also show a significant NB921 depression. We briefly discuss the nature of these NB921-depressed objects.

Based on data collected at the Subaru Telescope, which is operated by the National Astronomical Observatory of Japan.


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