A strong lyα emitter at z = 6.33 in the subaru deep field selected as an i′-dropout

T. Nagao, Y. Taniguchi, N. Kashikawa, K. Kodaira, N. Kaifu, H. Ando, H. Karoji, M. Ajiki, M. Akiyama, K. Aoki, M. Doi, S. S. Fujita, H. Furusawa, T. Hayashino, F. Iwamuro, M. Iye, N. Kobayashi, T. Kodama, Y. Komiyama, Y. MatsudaS. Miyazaki, Y. Mizumoto, T. Morokuma, K. Motohara, T. Murayama, K. Nariai, K. Ohta, S. Okamura, M. Ouchi, T. Sasaki, Y. Sato, K. Sekiguchi, K. Shimasaku, Y. Shioya, H. Tamura, I. Tanaka, M. Umemura, T. Yamada, N. Yasuda, M. Yoshida

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39 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)L9-L12
JournalAstrophysical Journal
Issue number1 II
Publication statusPublished - 2004 Sept 20


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


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