Hidenobu Yajima

1. 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, Masami Ouchi, Isobe, Yuki +21 · 8 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
2. The Formation of the First Quasars. I. The Black Hole Seeds, Accretion and Feedback Models
   2020/12/02 by Qirong Zhu, Yuexing Li, Zhu, Qirong +11 · 2 citations
   Physics and Astronomy · #Astronomy and Astrophysical Research #Galaxies: Formation, Evolution, Phenomena #Astrophysical Phenomena and Observations
3. 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 · 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
4. FOREVER22: Gas and metal outflow from massive galaxies in protocluster regions
   2023/09/11 by Naoki Harada, Harada, Naoki, Hidenobu Yajima +3 · 2 citations
   Physics and Astronomy · #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena
5. EMPRESS. XV. A New Determination of the Primordial Helium Abundance Suggesting a Moderately Low Y_P Value
   2025/06/30 by Hiroto Yanagisawa, Yanagisawa, Hiroto, Masami Ouchi +39 · 9 citations
   Physics and Astronomy · #Astronomy and Astrophysical Research #Electrical and Electromagnetic Research #Galaxies: Formation, Evolution, Phenomena #astro-ph.CO #astro-ph.GA
6. 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, Yanagisawa, Hiroto, Masami Ouchi +25 · 2 citations
   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
7. Bridging Theory and Observations: Insights into Star Formation Efficiency and Dust Attenuation in z > 5 Galaxies
   2025/02/18 by Daisuke Toyouchi, Toyouchi, Daisuke, Hidenobu Yajima +5 · 3 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
8. Impacts of stellar wind and supernovae on the star cluster formation: origins of extremely high N/O ratios and multiple stellar populations
   2024/04/16 by Hajime Fukushima, Fukushima, Hajime, Hidenobu Yajima +1 · 1 citation
   Physics and Astronomy · #Astro and Planetary Science #Astrophysics and Star Formation Studies #Astrophysics of Galaxies (astro-ph.GA) #FOS: Physical sciences #Solar and Stellar Astrophysics (astro-ph.SR) #Stellar, planetary, and galactic studies
9. Cosmic Himalayas: The Highest Quasar Density Peak Identified in a 10,000 deg² Sky with Spatial Discrepancies between Galaxies, Quasars, and IGM HI
   2024/04/24 by Yongming Liang, Liang, Yongming, Masami Ouchi +57 · 1 citation
   Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics of Galaxies (astro-ph.GA) #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Galaxies: Formation, Evolution, Phenomena #Stellar, planetary, and galactic studies
10. 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