Zobrazeno 1 - 10
of 101
pro vyhledávání: '"Hidenobu Yajima"'
Autor:
Hiroto Yanagisawa, Masami Ouchi, Kuria Watanabe, Akinori Matsumoto, Kimihiko Nakajima, Hidenobu Yajima, Kentaro Nagamine, Koh Takahashi, Minami Nakane, Nozomu Tominaga, Hiroya Umeda, Hajime Fukushima, Yuichi Harikane, Yuki Isobe, Yoshiaki Ono, Yi Xu, Yechi Zhang
Publikováno v:
The Astrophysical Journal, Vol 974, Iss 2, p 266 (2024)
We present He i /H β flux and He/H abundance ratios in three James Webb Space Telescope galaxies with significant constraints on N/O abundance ratios, GS-NDG-9422, RXCJ2248-ID, and GLASS150008 at z ∼ 6 mostly with the spectroscopic coverage from H
Externí odkaz:
https://doaj.org/article/eb09a0df57fb453e846492ddc1992042
Autor:
Hiroto Yanagisawa, Masami Ouchi, Kimihiko Nakajima, Hidenobu Yajima, Hiroya Umeda, Shunsuke Baba, Takao Nakagawa, Minami Nakane, Akinori Matsumoto, Yoshiaki Ono, Yuichi Harikane, Yuki Isobe, Yi Xu, Yechi Zhang
Publikováno v:
The Astrophysical Journal, Vol 974, Iss 2, p 180 (2024)
We investigate the physical origins of the Balmer decrement anomalies in GS-NDG-9422 and RXCJ2248-ID galaxies at z ∼ 6 whose H α /H β values are significantly smaller than 2.7, the latter of which also shows anomalous H γ /H β and H δ /H β va
Externí odkaz:
https://doaj.org/article/d3273fd65e414c8c89aa8548616e47ae
Publikováno v:
The Astrophysical Journal, Vol 970, Iss 1, p 14 (2024)
JWST observations of galaxies at z ≳ 8 suggest that they are more luminous and clumpier than predicted by most models, prompting several proposals on the physics of star formation and feedback in the first galaxies. In this paper, we focus on the r
Externí odkaz:
https://doaj.org/article/372f59754851448e9f6850a030f66ac8
Autor:
Yi Xu, Masami Ouchi, Yuki Isobe, Kimihiko Nakajima, Shinobu Ozaki, Nicolas F. Bouché, John H. Wise, Eric Emsellem, Haruka Kusakabe, Takashi Hattori, Tohru Nagao, Gen Chiaki, Hajime Fukushima, Yuichi Harikane, Kohei Hayashi, Yutaka Hirai, Ji Hoon Kim, Michael V. Maseda, Kentaro Nagamine, Takatoshi Shibuya, Yuma Sugahara, Hidenobu Yajima, Shohei Aoyama, Seiji Fujimoto, Keita Fukushima, Shun Hatano, Akio K. Inoue, Tsuyoshi Ishigaki, Masahiro Kawasaki, Takashi Kojima, Yutaka Komiyama, Shuhei Koyama, Yusei Koyama, Chien-Hsiu Lee, Akinori Matsumoto, Ken Mawatari, Takashi J. Moriya, Kentaro Motohara, Kai Murai, Moka Nishigaki, Masato Onodera, Yoshiaki Ono, Michael Rauch, Tomoki Saito, Rin Sasaki, Akihiro Suzuki, Tsutomu T. Takeuchi, Hiroya Umeda, Masayuki Umemura, Kuria Watanabe, Kiyoto Yabe, Yechi Zhang
Publikováno v:
The Astrophysical Journal, Vol 961, Iss 1, p 49 (2024)
We present the demography of the dynamics and gas mass fraction of 33 extremely metal-poor galaxies (EMPGs) with metallicities of 0.015–0.195 Z _⊙ and low stellar masses of 10 ^4 –10 ^8 M _⊙ in the local universe. We conduct deep optical inte
Externí odkaz:
https://doaj.org/article/676be6f7cd2249aeae362e439f3fe5f9
Autor:
Yuki Isobe, Masami Ouchi, Nozomu Tominaga, Kuria Watanabe, Kimihiko Nakajima, Hiroya Umeda, Hidenobu Yajima, Yuichi Harikane, Hajime Fukushima, Yi Xu, Yoshiaki Ono, Yechi Zhang
Publikováno v:
The Astrophysical Journal, Vol 959, Iss 2, p 100 (2023)
We present chemical abundance ratios of 70 star-forming galaxies at z ∼ 4–10 observed by the JWST/NIRSpec Early Release Observations, GLASS, and CEERS programs. Among the 70 galaxies, we have pinpointed two galaxies, CEERS_01019 at z = 8.68 and G
Externí odkaz:
https://doaj.org/article/d0c27bd4345a44999e0cf9e96b14dbfc
Autor:
Moka Nishigaki, Masami Ouchi, Kimihiko Nakajima, Yoshiaki Ono, Michael Rauch, Yuki Isobe, Yuichi Harikane, Kanako Narita, Fakhri Zahedy, Yi Xu, Hidenobu Yajima, Hajime Fukushima, Yutaka Hirai, Ji Hoon Kim, Shigeki Inoue, Haruka Kusakabe, Chien-Hsiu Lee, Tohru Nagao, Masato Onodera
Publikováno v:
The Astrophysical Journal, Vol 952, Iss 1, p 11 (2023)
We search for local extremely metal-poor galaxies (EMPGs), selecting photometric candidates by broadband color excess and machine-learning techniques with the SDSS photometric data. After removing stellar contaminants by shallow spectroscopy with Sei
Externí odkaz:
https://doaj.org/article/5629754457f54d329a7f8145f8a7eda3
Autor:
Yuki Isobe, Masami Ouchi, Kimihiko Nakajima, Shinobu Ozaki, Nicolas F. Bouché, John H. Wise, Yi Xu, Eric Emsellem, Haruka Kusakabe, Takashi Hattori, Tohru Nagao, Gen Chiaki, Hajime Fukushima, Yuichi Harikane, Kohei Hayashi, Yutaka Hirai, Ji Hoon Kim, Michael V. Maseda, Kentaro Nagamine, Takatoshi Shibuya, Yuma Sugahara, Hidenobu Yajima, Shohei Aoyama, Seiji Fujimoto, Keita Fukushima, Shun Hatano, Akio K. Inoue, Tsuyoshi Ishigaki, Masahiro Kawasaki, Takashi Kojima, Yutaka Komiyama, Shuhei Koyama, Yusei Koyama, Chien-Hsiu Lee, Akinori Matsumoto, Ken Mawatari, Takashi J. Moriya, Kentaro Motohara, Kai Murai, Moka Nishigaki, Masato Onodera, Yoshiaki Ono, Michael Rauch, Tomoki Saito, Rin Sasaki, Akihiro Suzuki, Tsutomu T. Takeuchi, Hiroya Umeda, Masayuki Umemura, Kuria Watanabe, Kiyoto Yabe, Yechi Zhang
Publikováno v:
The Astrophysical Journal, Vol 951, Iss 2, p 102 (2023)
We present kinematics of six local extremely metal-poor galaxies (EMPGs) with low metallicities (0.016–0.098 Z _⊙ ) and low stellar masses (10 ^4.7 –10 ^7.6 M _⊙ ). Taking deep medium/high-resolution ( R ∼ 7500) integral-field spectra with
Externí odkaz:
https://doaj.org/article/ecaf49e39cde4e3b8fd3e73fb1e4c8c2
Autor:
Yoshiaki Ono, Yuichi Harikane, Masami Ouchi, Hidenobu Yajima, Makito Abe, Yuki Isobe, Takatoshi Shibuya, John H. Wise, Yechi Zhang, Kimihiko Nakajima, Hiroya Umeda
Publikováno v:
The Astrophysical Journal, Vol 951, Iss 1, p 72 (2023)
We present morphologies of galaxies at z ≳ 9 resolved by JWST/NIRCam 2–5 μ m imaging. Our sample consists of 22 galaxy candidates identified by stringent dropout and photo- z criteria in GLASS, CEERS, SMACS J0723, and Stephan’s Quintet flankin
Externí odkaz:
https://doaj.org/article/bdb5cd9158be4bafa5b746176b3808a2
Autor:
Dongsheng Sun, Ken Mawatari, Masami Ouchi, Yoshiaki Ono, Hidenobu Yajima, Yechi Zhang, Makito Abe, William P. Bowman, Erin Mentuch Cooper, Dustin Davis, Daniel J. Farrow, Karl Gebhardt, Gary J. Hill, Chenxu Liu, Donald P. Schneider
Publikováno v:
The Astrophysical Journal, Vol 951, Iss 1, p 25 (2023)
We present cosmological-scale three-dimensional neutral hydrogen (H i ) tomographic maps at z = 2–3 over a total of 837 deg ^2 in two blank fields that are developed with Ly α forest absorptions of 14,736 background Sloan Digital Sky Survey (SDSS)
Externí odkaz:
https://doaj.org/article/061c4551f6bc4ab99fe91b4d82beb3ab
Autor:
Ryota Ura, Takuya Hashimoto, Akio K. Inoue, Dario Fadda, Matthew Hayes, Johannes Puschnig, Erik Zackrisson, Yoichi Tamura, Hiroshi Matsuo, Ken Mawatari, Yoshinobu Fudamoto, Masato Hagimoto, Nario Kuno, Yuma Sugahara, Satoshi Yamanaka, Tom J. L. C. Bakx, Yurina Nakazato, Mitsutaka Usui, Hidenobu Yajima, Naoki Yoshida
Publikováno v:
The Astrophysical Journal, Vol 948, Iss 1, p 3 (2023)
We present integral field, far-infrared (FIR) spectroscopy of Mrk 54, a local Lyman continuum emitter, obtained with FIFI-LS on the Stratospheric Observatory for Infrared Astronomy. This is only the second time, after Haro 11, that [C ii ] 158 μ m a
Externí odkaz:
https://doaj.org/article/e621c8443e31461096e278288cdc8e72