A Strong Lyman-alpha 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. Hurusawa; T. Hayashino; F. Iwamuro; M. Iye; N. Kobayashi; T. Kodama; Y. Komiyama; Y. Matsuda; S. 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

doi:10.1086/424965

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A Strong Lyman-alpha Emitter at z=6.33 in the Subaru Deep Field Selected as an i' Dropout

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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 Ly-alpha emitter with only very faint ultraviolet continuum. The rest-frame equivalent width of the detected Ly-alpha emission is as much as 130 A. Thus the light detected in our z' image is largely attributed to the Ly-alpha emission, i.e., ~40% of the z'-band flux is the strong Ly-alpha emission, giving a very red i'-z' color. This is consistent with the photometric property of this object because the narrow-band data obtained with the NB921 filter shows 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.

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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. Hurusawa, T. Hayashino, F. Iwamuro, M. Iye, N. Kobayashi, T. Kodama, Y. Komiyama, Y. Matsuda, S. 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. 2004-08-13. A Strong Lyman-alpha Emitter at z=6.33 in the Subaru Deep Field Selected as an i' Dropout. https://doi.org/10.1086/424965

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