Search Results - "Harikane, Yuichi"

A Comprehensive Study of Galaxies at z ∼ 9–16 Found in the Early JWST Data: Ultraviolet Luminosity Functions and Cosmic Star Formation History at the Pre-reionization Epoch by Harikane, Yuichi, Ouchi, Masami, Oguri, Masamune, Ono, Yoshiaki, Nakajima, Kimihiko, Isobe, Yuki, Umeda, Hiroya, Mawatari, Ken, Zhang, Yechi

“…Abstract We conduct a comprehensive study on dropout galaxy candidates at z ∼ 9–16 using the first 90 arcmin 2 James Webb Space Telescope (JWST) Near Infrared…”
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A JWST/NIRSpec First Census of Broad-line AGNs at z = 4–7: Detection of 10 Faint AGNs with M BH ∼ 106–108 M ⊙ and Their Host Galaxy Properties by Harikane, Yuichi, Zhang, Yechi, Nakajima, Kimihiko, Ouchi, Masami, Isobe, Yuki, Ono, Yoshiaki, Hatano, Shun, Xu, Yi, Umeda, Hiroya

“…We present the first statistical sample of faint type 1 AGNs at z > 4 identified by JWST/NIRSpec deep spectroscopy. Among the 185 galaxies at z _spec = 3.8–8.9…”
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JWST Census for the Mass–Metallicity Star Formation Relations at z = 4–10 with Self-consistent Flux Calibration and Proper Metallicity Calibrators by Nakajima, Kimihiko, Ouchi, Masami, Isobe, Yuki, Harikane, Yuichi, Zhang, Yechi, Ono, Yoshiaki, Umeda, Hiroya, Oguri, Masamune

“…Abstract We present the evolution of the mass–metallicity (MZ) relation at z = 4–10 derived with 135 galaxies identified in JWST/NIRSpec data taken from the…”
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Stellar Initial Mass Function (IMF) Probed with Supernova Rates and Neutrino Background: Cosmic-average IMF Slope Is ≃2–3 Similar to the Salpeter IMF by Aoyama, Shohei, Ouchi, Masami, Harikane, Yuichi

“…Abstract The stellar initial mass function (IMF) is expressed by ϕ ( m ) ∝ m − α with the slope α , and known as a poorly constrained but very important…”
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A Search for H-Dropout Lyman Break Galaxies at z ∼ 12–16 by Harikane, Yuichi, Inoue, Akio K., Mawatari, Ken, Hashimoto, Takuya, Yamanaka, Satoshi, Fudamoto, Yoshinobu, Matsuo, Hiroshi, Tamura, Yoichi, Dayal, Pratika, Yung, L. Y. Aaron, Hutter, Anne, Pacucci, Fabio, Sugahara, Yuma, Koekemoer, Anton M.

“…We present two bright galaxy candidates at z ∼ 12–13 identified in our H-dropout Lyman break selection with 2.3 deg(exp 2) near-infrared deep imaging data…”
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Long Gamma-Ray Burst Rate at Very High Redshift by Kinugawa, Tomoya, Harikane, Yuichi, Asano, Katsuaki

“…Future missions for long gamma-ray burst (GRB) observations at high redshift, such as the High-z Gamma-ray bursts for Unraveling the Dark Ages Mission and the…”
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Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). VI. Black Hole Mass Measurements of Six Quasars at 6.1 ≤ z ≤ 6.7 by Onoue, Masafusa, Kashikawa, Nobunari, Matsuoka, Yoshiki, Kato, Nanako, Izumi, Takuma, Nagao, Tohru, Strauss, Michael A., Harikane, Yuichi, Imanishi, Masatoshi, Ito, Kei, Iwasawa, Kazushi, Kawaguchi, Toshihiro, Lee, Chien-Hsiu, Noboriguchi, Akatoki, Suh, Hyewon, Tanaka, Masayuki, Toba, Yoshiki

“…We present deep near-infrared spectroscopy of six quasars at 6.1 ≤ z ≤ 6.7 with Very Large Telescope/X-Shooter and Gemini-N/GNIRS. Our objects, originally…”
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Are the newly-discovered z ∼ 13 drop-out sources starburst galaxies or quasars? by Pacucci, Fabio, Dayal, Pratika, Harikane, Yuichi, Inoue, Akio K, Loeb, Abraham

“…ABSTRACT The detection of two z ∼ 13 galaxy candidates has opened a new window on galaxy formation at an era only 330 Myr after the big bang. Here, we…”
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Early Low-mass Galaxies and Star-cluster Candidates at z ∼ 6-9 Identified by the Gravitational-lensing Technique and Deep Optical/Near-infrared Imaging by Kikuchihara, Shotaro, Ouchi, Masami, Ono, Yoshiaki, Mawatari, Ken, Chevallard, Jacopo, Harikane, Yuichi, Kojima, Takashi, Oguri, Masamune, Bruzual, Gustavo, Charlot, Stéphane

“…We present very faint dropout galaxies at z ∼ 6−9 with a stellar mass M down to that are found in deep optical/near-infrared (NIR) images of the full data sets…”
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Fast Outflows Identified in Early Star-forming Galaxies at z = 5-6 by Sugahara, Yuma, Ouchi, Masami, Harikane, Yuichi, Bouché, Nicolas, Mitchell, Peter D., Blaizot, Jérémy

“…We present velocities of galactic outflows in seven star-forming galaxies at z = 5-6 with stellar masses of M* ∼ 1010.1 . Although it is challenging to…”
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The onset of star formation 250 million years after the Big Bang by Hashimoto, Takuya, Laporte, Nicolas, Mawatari, Ken, Ellis, Richard S., Inoue, Akio K., Zackrisson, Erik, Roberts-Borsani, Guido, Zheng, Wei, Tamura, Yoichi, Bauer, Franz E., Fletcher, Thomas, Harikane, Yuichi, Hatsukade, Bunyo, Hayatsu, Natsuki H., Matsuda, Yuichi, Matsuo, Hiroshi, Okamoto, Takashi, Ouchi, Masami, Pelló, Roser, Rydberg, Claes-Erik, Shimizu, Ikkoh, Taniguchi, Yoshiaki, Umehata, Hideki, Yoshida, Naoki

“…A fundamental quest of modern astronomy is to locate the earliest galaxies and study how they influenced the intergalactic medium a few hundred million years…”
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Morphologies of Galaxies at z ≳ 9 Uncovered by JWST/NIRCam Imaging: Cosmic Size Evolution and an Identification of an Extremely Compact Bright Galaxy at z ∼ 12 by Ono, Yoshiaki, Harikane, Yuichi, Ouchi, Masami, Yajima, Hidenobu, Abe, Makito, Isobe, Yuki, Shibuya, Takatoshi, Wise, John H., Zhang, Yechi, Nakajima, Kimihiko, Umeda, Hiroya

“…Abstract 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…”
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EMPRESS. VII. Ionizing Spectrum Shapes of Extremely Metal-poor Galaxies: Uncovering the Origins of Strong He ii and the Impact on Cosmic Reionization by Umeda, Hiroya, Ouchi, Masami, Nakajima, Kimihiko, Isobe, Yuki, Aoyama, Shohei, Harikane, Yuichi, Ono, Yoshiaki, Matsumoto, Akinori

“…Abstract Strong high-ionization lines such as He ii of young galaxies are puzzling at high and low redshift. Although recent studies suggest the existence of…”
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Redshift Evolution of Electron Density in the Interstellar Medium at z ∼ 0–9 Uncovered with JWST/NIRSpec Spectra and Line-spread Function Determinations by Isobe, Yuki, Ouchi, Masami, Nakajima, Kimihiko, Harikane, Yuichi, Ono, Yoshiaki, Xu, Yi, Zhang, Yechi, Umeda, Hiroya

“…Abstract We present electron densities n e in the interstellar medium (ISM) of star-forming galaxies at z = 4–9 observed by the JWST/NIRSpec GLASS, Early…”
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Lyα Emission at z = 7–13: Clear Evolution of Lyα Equivalent Width Indicating a Late Cosmic Reionization History by Nakane, Minami, Ouchi, Masami, Nakajima, Kimihiko, Harikane, Yuichi, Ono, Yoshiaki, Umeda, Hiroya, Isobe, Yuki, Zhang, Yechi, Xu, Yi

“…Abstract We present the evolution of Ly α emission derived from 53 galaxies at z = 6.6–13.2, which have been identified by multiple JWST/NIRSpec spectroscopy…”
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Evolution of N/O abundance ratios and ionization parameters from z ∼ 0 to 2 investigated by the direct temperature method by Kojima, Takashi, Ouchi, Masami, Nakajima, Kimihiko, Shibuya, Takatoshi, Harikane, Yuichi, Ono, Yoshiaki

“…Abstract We present N/O abundance ratios, ionization parameters q ion, and oxygen abundances O/H for a total of 41 galaxies (11 individual galaxies and a…”
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EMPRESS. V. Metallicity Diagnostics of Galaxies over 12 + log(O/H) ≃ 6.9–8.9 Established by a Local Galaxy Census: Preparing for JWST Spectroscopy by Nakajima, Kimihiko, Ouchi, Masami, Xu, Yi, Rauch, Michael, Harikane, Yuichi, Nishigaki, Moka, Isobe, Yuki, Kusakabe, Haruka, Nagao, Tohru, Ono, Yoshiaki, Onodera, Masato, Sugahara, Yuma, Kim, Ji Hoon, Komiyama, Yutaka, Lee, Chien-Hsiu, Zahedy, Fakhri S.

“…Abstract We present optical-line gas metallicity diagnostics established by the combination of local SDSS galaxies and the largest compilation of extremely…”
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JWST Identification of Extremely Low C/N Galaxies with [N/O] ≳ 0.5 at z ∼ 6–10 Evidencing the Early CNO-cycle Enrichment and a Connection with Globular Cluster Formation by Isobe, Yuki, Ouchi, Masami, Tominaga, Nozomu, Watanabe, Kuria, Nakajima, Kimihiko, Umeda, Hiroya, Yajima, Hidenobu, Harikane, Yuichi, Fukushima, Hajime, Xu, Yi, Ono, Yoshiaki, Zhang, Yechi

“…Abstract 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…”
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The Mean Absorption-line Spectra of a Selection of Luminous z ∼ 6 Lyman Break Galaxies by Harikane, Yuichi, Laporte, Nicolas, Ellis, Richard S., Matsuoka, Yoshiki

“…Abstract We examine the absorption-line spectra of a sample of 31 luminous ( ) Lyman break galaxies at redshift z  ≃ 6 using data taken with the FOCAS and…”
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FOREVER22: the first bright galaxies with Population III stars at redshifts z ≃ 10–20 and comparisons with JWST data by Yajima, Hidenobu, Abe, Makito, Fukushima, Hajime, Ono, Yoshiaki, Harikane, Yuichi, Ouchi, Masami, Hashimoto, Takuya, Khochfar, Sadegh

“…ABSTRACT We study the formation of the first galaxies in overdense regions modelled by the FORmation and EVolution of galaxies in Extremely overdense Regions…”
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