Shinobu S. Fujita
Tohoku University
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Featured researches published by Shinobu S. Fujita.
Publications of the Astronomical Society of Japan | 2005
Yoshiaki Taniguchi; Masaru Ajiki; Tohru Nagao; Yasuhiro Shioya; Takashi Murayama; Nobunari Kashikawa; Keiichi 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; Y. Matsuda; Satoshi Miyazaki; Yoshihiko Mizumoto; Kentaro Motohara; Kyoji Nariai; K. Ohta; Youichi Ohyama; Sadanori Okamura; Masami Ouchi
We present new 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. We obtained a photometric sample of 58 Ly α emitter candidates at z ≈ 6.5-6.6 among ∼ 180 strong NB921-excess (z � −NB921 > 1.0) objects together with a color criterion of i � −z � > 1.3. We then obtained optical spectra of 20 objects in our NB921-excess sample, and identified at least nine Ly α emitters at z ∼ 6.5-6.6, including the two emitters reported by Kodaira et al. (2003, PASJ, 55, L17). Since our Ly α-emitter candidates are free from strong amplification of gravitational lensing, we are able to discuss their observational properties from a statistical point of view. Based on these new results, we obtained a lower limit of the star-formation rate density of ρSFR � 5.7 ×10 −4 h0.7 Myr −1 Mpc −3 at z ≈ 6.6, being
Monthly Notices of the Royal Astronomical Society | 2007
Philip Lah; Jayaram N. Chengalur; F. Briggs; Matthew Colless; Roberto De Propris; Michael Pracy; W. J. G. de Blok; Shinobu S. Fujita; Masaru Ajiki; Yasuhiro Shioya; Tohru Nagao; Takashi Murayama; Yoshiaki Taniguchi; Masafumi Yagi; Sadanori Okamura
We use observations from the Giant Metrewave Radio Telescope (GMRT) to measure the atomic hydrogen gas content of star-forming galaxies at z = 0.24 (i.e. a look-back time of ∼3 Gyr). The sample of galaxies studied were selected from Hα-emitting field galaxies detected in a narrow-band imaging survey with the Subaru Telescope. The Anglo-Australian Telescope was used to obtain precise optical redshifts for these galaxies. We then co-added the H I 21-cm emission signal for all the galaxies within the GMRT spectral line data cube. From the co-added signal of 121 galaxies, we measure an average atomic hydrogen gas mass of (2.26 ± 0.90) × 10 9 M� . We translate this H I signal into a cosmic density of neutral gas at z = 0.24 ‐ ‐
The Astrophysical Journal | 2003
Shinobu S. Fujita; Masaru Ajiki; Yasuhiro Shioya; Tohru Nagao; Takashi Murayama; Yoshiaki Taniguchi; Kazuyoshi Umeda; Sanae Yamada; Masafumi Yagi; Sadanori Okamura; Yutaka Komiyama
We have carried out a deep imaging survey for Hα-emitting galaxies at z ≈ 0.24 using a narrowband filter tuned with the redshifted line. The total sky area covered is 706 arcmin2 within a redshift range from 0.234 to 0.252 (δz = 0.018). This corresponds to a volume of 3.9 × 103 Mpc3 when Ωmatter = 0.3, ΩΛ = 0.7, and H0 = 70 km s-1 Mpc-1 are adopted. We obtain a sample of 348 Hα-emitting galaxies whose observed emission-line equivalent widths are greater than 12 A. We find an extinction-corrected Hα luminosity density of 10 ergs s-1 Mpc-3. Using the Kennicutt relation between the Hα luminosity and the star formation rate, the star formation rate density in the covered volume is estimated to be 0.036 M☉ yr-1 Mpc-3. This value is higher by a factor of 3 than the local star formation rate density.
Publications of the Astronomical Society of Japan | 2003
Keiichi Kodaira; Yoshiaki Taniguchi; Nobunari Kashikawa; Norio Kaifu; Hiroyasu Ando; Hiroshi Karoji; Masaru Ajiki; Masayuki Akiyama; Kentaro Aoki; Mamoru Doi; Shinobu S. Fujita; Hisanori Furusawa; Tomoki Hayashino; Masatoshi Imanishi; Fumihide Iwamuro; Masanori Iye; Koji S. Kawabata; Naoto Kobayashi; Tadayuki Kodama; Yutaka Komiyama; George Kosugi; Y. Matsuda; Satoshi Miyazaki; Yoshihiko Mizumoto; Kentaro Motohara; Takashi Murayama; Tohru Nagao; Kyoji Nariai; Kouji Ohta; Youichi Ohyama
We performed a deep optical imaging survey using a narrow-band filter (NB921) centered at λ=9196 u A together
The Astrophysical Journal | 2002
Masaru Ajiki; Yoshiaki Taniguchi; Takashi Murayama; Tohru Nagao; Sylvain Veilleux; Yasuhiro Shioya; Shinobu S. Fujita; Yuko Kakazu; Yutaka Komiyama; Sadanori Okamura; David B. Sanders; Shinki Oyabu; Kimiaki Kawara; Youichi Ohyama; Masanori Iye; Nobunari Kashikawa; Michitoshi Yoshida; Toshiyuki Sasaki; George Kosugi; Kentaro Aoki; Tadafumi Takata; Yoshihiko Saito; Koji S. Kawabata; Kazuhiro Sekiguchi; Kiichi Okita; Yasuhiro Shimizu; Motoko Inata; Noboru Ebizuka; Tomohiko Ozawa; Yasushi Yadoumaru
During the course of our deep optical imaging survey for Ly alpha emitters at z approximately 5.7 in the field around the z=5.74 quasar SDSSp J104433.04-012502.2, we have found a candidate strong emission-line source. Follow-up optical spectroscopy shows that the emission line profile of this object is asymmetric, showing excess red-wing emission. These properties are consistent with an identification of Ly alpha emission at a redshift of z=5.687 +/- 0.002. The observed broad line width, Delta V_{FWHM} ~= 340 km s^{-1} and excess red-wing emission also suggest that this object hosts a galactic superwind.
The Astronomical Journal | 2003
Shinobu S. Fujita; Masaru Ajiki; Yasuhiro Shioya; Tohru Nagao; Takashi Murayama; Yoshiaki Taniguchi; Sadanori Okamura; Masami Ouchi; Kazuhiro Shimasaku; Mamoru Doi; Hisanori Furusawa; Masaru Hamabe; Masahiko Kimura; Yutaka Komiyama; Masayuki Miyazaki; Satoshi Miyazaki; Fumiaki Nakata; Maki Sekiguchi; Masafumi Yagi; Naoki Yasuda; Yuichi Matsuda; Hajime Tamura; Tomoki Hayashino; Keiichi Kodaira; Hiroshi Karoji; Toru Yamada; Kouji Ohta; Masayuki Umemura
We present the results of a survey for emission-line objects based on optical intermediate-band (
arXiv: Astrophysics | 2002
Shinobu S. Fujita; Masaru Ajiki; Yasuhiro Shioya; Tohru Nagao; Takashi Murayama; Yoshiaki Taniguchi; Sadanori Okamura; Masami Ouchi; Kazuhiro Shimasaku; Mamoru Doi; Hisanori Furusawa; Masaru Hamabe; Masahiko Kimura; Yutaka Komiyama; Masayuki Miyazaki; Satoshi Miyazaki; Fumiaki Nakata; Maki Sekiguchi; Masafumi Yagi; Naoki Yasuda; Yuichi Matsuda; Hajime Tamura; Tomoki Hayashino; Keiichi Kodaira; Hiroshi Karoji; Toru Yamada; Kouji Ohta; Masayuki Umemura
\lambda_{\rm c}
The Astrophysical Journal | 2003
Yoshiaki Taniguchi; Masaru Ajiki; Takashi Murayama; Tohru Nagao; Sylvain Veilleux; David B. Sanders; Yutaka Komiyama; Yasuhiro Shioya; Shinobu S. Fujita; Yuko Kakazu; Sadanori Okamura; Hiroyasu Ando; Tetsuo Nishimura; Masahiko Hayashi; Ryusuke Ogasawara; Shin-ichi Ichikawa
= 5736 \AA ~ and
Journal of the Korean Astronomical Society | 2003
Yoshiaki Taniguchi; Yasuhiro Shioya; Masaru Ajiki; Shinobu S. Fujita; Tohru Nagao; Takashi Murayama
\Delta\lambda
Publications of the Astronomical Society of Japan | 2004
Masaru Ajiki; Yoshiaki Taniguchi; Shinobu S. Fujita; Yasuhiro Shioya; Tohru Nagao; Takashi Murayama; Sanae Yamada; Kazuyoshi Umeda; Shunji S. Sasaki; Ryoko Sumiya; Yutaka Komiyama
= 280 \AA) and broad-band (