M
Masayuki Umemura
Researcher at University of Tsukuba
Publications - 256
Citations - 10808
Masayuki Umemura is an academic researcher from University of Tsukuba. The author has contributed to research in topics: Galaxy & Star formation. The author has an hindex of 56, co-authored 249 publications receiving 10301 citations. Previous affiliations of Masayuki Umemura include Hokkaido University.
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Journal ArticleDOI
The End of the Reionization Epoch Probed by Lyα Emitters at z = 6.5 in the Subaru Deep Field* **
Nobunari Kashikawa,Kazuhiro Shimasaku,Matthew A. Malkan,Mamoru Doi,Yuichi Matsuda,Masami Ouchi,Yoshiaki Taniguchi,Chun Ly,Tohru Nagao,Masanori Iye,Kentaro Motohara,Takashi Murayama,Kouji Murozono,Kyoji Nariai,Kouji Ohta,Sadanori Okamura,Toshiyuki Sasaki,Yasuhiro Shioya,Masayuki Umemura +18 more
TL;DR: In this article, an extensive search for Lyα emitters (LAEs) at z = 6.5 in the Subaru Deep Field was conducted, which revealed an apparent deficit at the bright end of ∼ 0.75 mag fainter L*, compared with that observed at z=5.7.
Journal ArticleDOI
The End of the Reionization Epoch Probed by Ly-alpha Emitters at z=6.5 in the Subaru Deep Field
Nobunari Kashikawa,K. Shimasaku,Matthew A. Malkan,Masao Doi,Yoichi Matsuda,Masami Ouchi,Yoshiaki Taniguchi,Chun Ly,Tohru Nagao,Masanori Iye,Kentaro Motohara,Takashi Murayama,K. Murozono,Kyoji Nariai,Kunihiro Ohta,S. Okamura,Toshiyuki Sasaki,Y. Shioya,Masayuki Umemura +18 more
TL;DR: In this paper, an extensive search for Lyman-alpha emitters (LAEs) at z=6.5 in the Subaru Deep Field was conducted, which revealed an apparent deficit at the bright end of ~0.75 mag fainter L*, compared with that observed at z =5.7.
Journal ArticleDOI
On the Initial Mass Function of Population III Stars
TL;DR: In this paper, the collapse and fragmentation of filamentary primordial gas clouds are explored using one-and two-dimensional hydrodynamical simulations coupled with the nonequilibrium processes of hydrogen molecule formation.
Journal ArticleDOI
A special-purpose computer for gravitational many-body problems
Daiichiro Sugimoto,Yoshihiro Chikada,Junichiro Makino,Tomoyoshi Ito,Toshikazu Ebisuzaki,Masayuki Umemura +5 more
TL;DR: In this paper, a pipeline-based processor was constructed using a "pipeline" architecture to simulate many-body systems with long-range forces, and the architecture can be readily parallelized to make teraflop machines a feasible possibility.
Journal ArticleDOI
The SUBARU Deep Field Project: Lymanα Emitters at a Redshift of 6.6
Yoshiaki Taniguchi,Masaru Ajiki,Tohru Nagao,Tohru Nagao,Yasuhiro Shioya,Takashi Murayama,Nobunari Kashikawa,K. Kodaira,Norio Kaifu,Hiroyasu Ando,Hiroshi Karoji,Masayuki Akiyama,Kentaro Aoki,Mamoru Doi,Shinobu S. Fujita,Hisanori Furusawa,Tomoki Hayashino,Fumihide Iwamuro,Masanori Iye,Naoto Kobayashi,Tadayuki Kodama,Yutaka Komiyama,Yuichi Matsuda,Satoshi Miyazaki,Yoshihiko Mizumoto,Tomoki Morokuma,Kentaro Motohara,Kyoji Nariai,Koji Ohta,Youichi Ohyama,Sadanori Okamura,Masami Ouchi,Toshiyuki Sasaki,Yasunori Sato,Kazuhiro Sekiguchi,Kazuhiro Shimasaku,Hajime Tamura,Masayuki Umemura,Toru Yamada,Naoki Yasuda,Michitoshi Yoshida +40 more
TL;DR: In this paper, the results of a deep optical imaging survey using a narrow band filter (NB921) centered at λ = 9196 u A together with B, V, R, i �,a ndzbroadband 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.