Hiroya Umeda

1. A JWST/NIRSpec First Census of Broad-Line AGNs at z=4-7: Detection of 10 Faint AGNs with M_BH~10⁶-10⁸ M_sun and Their Host Galaxy Properties
   2023/03/21 by Yuichi Harikane, Harikane, Yuichi, Yechi Zhang +15 · 58 citations
   Engineering · Physics and Astronomy · #Astronomical Observations and Instrumentation #Astronomy and Astrophysical Research #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena
2. Pure Spectroscopic Constraints on UV Luminosity Functions and Cosmic Star Formation History From 25 Galaxies at z_spec=8.61-13.20 Confirmed with JWST/NIRSpec
   2023/04/13 by Yuichi Harikane, Kimihiko Nakajima, Harikane, Yuichi +13 · 18 citations
   Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Gamma-ray bursts and supernovae
3. JWST, ALMA, and Keck Spectroscopic Constraints on the UV Luminosity Functions at z~7-14: Clumpiness and Compactness of the Brightest Galaxies in the Early Universe
   2024/06/26 by Yuichi Harikane, Harikane, Yuichi, Akio Inoue +67 · 28 citations
   Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Stellar, planetary, and galactic studies
4. JWST Identification of Extremely Low C/N Galaxies with [N/O]\gtrsim 0.5 at z∼ 6-10 Evidencing the Early CNO-Cycle Enrichment and a Connection with Globular Cluster Formation
   2023/07/03 by Yuki Isobe, Isobe, Yuki, Masami Ouchi +21 · 7 citations
   Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Stellar, planetary, and galactic studies
5. JWST Census for the Mass-Metallicity Star-Formation Relations at z=4-10 with the Self-Consistent Flux Calibration and the Proper Metallicity Calibrators
   2023/01/30 by Kimihiko Nakajima, Nakajima, Kimihiko, Masami Ouchi +13 · 3 citations
   Physics and Astronomy · #Galaxies: Formation, Evolution, Phenomena #Astronomy and Astrophysical Research #Stellar, planetary, and galactic studies
6. SILVERRUSH. XIV. Lya Luminosity Functions and Angular Correlation Functions from ~20,000 Lya Emitters at z~2.2-7.3 from upto 24 \rm deg² HSC-SSP and CHORUS Surveys: Linking the Post-Reionization Epoch to the Heart of Reionization
   2024/11/23 by Hiroya Umeda, Masami Ouchi, Umeda, Hiroya +25 · 4 citations
   Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences
7. Strong He I Emission Lines in High N/O Galaxies at z ∼ 6 Identified in JWST Spectra: High He/H Abundance Ratios or High Electron Densities?
   2024/05/03 by Hiroto Yanagisawa, Masami Ouchi, Yanagisawa, Hiroto +31 · 3 citations
   Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena
8. Stellar- and AGN-Driven Outflows in JWST Galaxies at z=3-9: More Frequent, Wider Opening Angles, and Mostly Bounded
   2023/10/10 by Yi Xu, Masami Ouchi, Xu, Yi +13 · 2 citations
   Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Gamma-ray bursts and supernovae
9. SILVERRUSH. XIII. A Catalog of 20,567 Lyα Emitters at z=2-7 Identified in the Full-depth Data of the Subaru/HSC-SSP and CHORUS Surveys
   2023/05/15 by Satoshi Kikuta, Masami Ouchi, Kikuta, Satoshi +29 · 2 citations
   Physics and Astronomy · #Galaxies: Formation, Evolution, Phenomena #Astronomy and Astrophysical Research #Gamma-ray bursts and supernovae
10. Probing the Cosmic Reionization History with JWST: Gunn-Peterson and Lyα Damping Wing Absorption at 4.5 < z < 13
    2025/04/07 by Hiroya Umeda, Masami Ouchi, Umeda, Hiroya +11 · 3 citations
    Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics of Galaxies (astro-ph.GA) #Cosmology and Gravitation Theories #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena
11. Census for the Rest-frame Optical and UV Morphologies of Galaxies at z=4-10: First Phase of Inside-Out Galaxy Formation
    2023/09/06 by Yoshiaki Ono, Ono, Yoshiaki, Yuichi Harikane +17 · 1 citation
    Physics and Astronomy · #Adaptive optics and wavefront sensing #Astronomy and Astrophysical Research #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena
12. Balmer Decrement Anomalies in Galaxies at z ~ 6 Found by JWST Observations: Density-Bounded Nebulae or Excited H I Clouds?
    2024/03/29 by Hiroto Yanagisawa, Masami Ouchi, Yanagisawa, Hiroto +25 · 1 citation
    Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Stellar, planetary, and galactic studies
13. Discovery of a Little Red Dot candidate at z\gtrsim10 in COSMOS-Web based on MIRI-NIRCam selection
    2025/07/31 by Takumi S. Tanaka, Hollis B. Akins, Tanaka, Takumi S. +131 · 4 citations
    Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena
14. Gas-Phase Metallicity and Nitrogen Abundances in Low-Mass Galaxies Down to M_⋆≃10^5.7 M_\odot at z≃4.5--10.1 from JWST Lensing Cluster Surveys
    2026/07/17 by Hiroya Umeda, Masami Ouchi, Kimihiko Nakajima +7
    #astro-ph.GA