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Kobayashi, Masami Ouchi, Masaru Kajisawa, Naoki Yasuda, Nobunari Kashikawa, Olivier Le Fevre, Tadafumi Takata, Toru Yamada, Yoshiaki Naito, Yoshiaki Taniguchi, Yuki Okura","submitted_at":"2016-04-08T02:34:31Z","abstract_excerpt":"We study the extent to which very bright (-23.0 < MUV < -21.75) Lyman-break selected galaxies at redshifts z~7 display detectable Lya emission. To explore this issue, we have obtained follow-up optical spectroscopy of 9 z~7 galaxies from a parent sample of 24 z~7 galaxy candidates selected from the 1.65 sq.deg COSMOS-UltraVISTA and SXDS-UDS survey fields using the latest near-infrared public survey data, and new ultra-deep Subaru z'-band imaging (which we also present and describe in this paper). 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