Hiroya Umeda

Kavli Institute for the Physics and Mathematics of the Universe — Japan

Physics and Astronomy · Physical Sciences

18h-index2.1kcitations61works10.22yr avg
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Research Topics

Galaxies: Formation, Evolution, Phenomena(47), Astronomy and Astrophysical Research(35), Stellar, planetary, and galactic studies(17), Gamma-ray bursts and supernovae(16), Astrophysical Phenomena and Observations(15)

Publications60 total

DREAMS.II. Galaxy Demographics from Direct Te-Based Metallicities at z~2-10: Tracing the Evolution of the Mass-Metallicity and Fundamental Relations
arXiv (Cornell University)·2025Open Access
Little red dot variability over a century reveals black hole envelope via a giant Einstein cross
arXiv (Cornell University)·2025Open Access
A Black-Hole Envelope Interpretation for Cosmological Demographics of Little Red Dots
arXiv (Cornell University)·2025Open Access
Discovery of a Little Red Dot Candidate at <i>z</i>  ≳ 10 in COSMOS-web Based on MIRI-NIRCam Selection
The Astrophysical Journal·2025· 1 citedOpen Access
Discovery of a Little Red Dot candidate at $z\gtrsim10$ in COSMOS-Web based on MIRI-NIRCam selection
arXiv (Cornell University)·2025Open Access
A Galaxy with an Extremely Blue Ultraviolet Slope <i>β</i> = −3 at <i>z</i> = 9.25 Identified by JWST Spectroscopy: Evidence for a Weak Nebular Continuum and Efficient Ionizing Photon Escape?
The Astrophysical Journal·2025· 5 citedOpen Access
An Ultra-Faint, Chemically Primitive Galaxy Forming at the Epoch of Reionization
ArXiv.org·2025· 2 citedOpen Access
Census of Ly<i>α</i> Emission from ∼600 Galaxies at <i>z</i> = 5–14: Evolution of the Ly<i>α</i> Luminosity Function and a Late Sharp Cosmic Reionization
The Astrophysical Journal Supplement Series·2025· 8 citedOpen Access
Stellar- and AGN-driven Outflows in JWST Galaxies at <i>z</i> = 3–9: More Frequent, Wider Opening Angles, and Mostly Bounded
The Astrophysical Journal·2025· 10 citedOpen Access
Probing the Cosmic Reionization History with JWST: Gunn-Peterson and Ly$α$ Damping Wing Absorption at $4.5 &lt; z &lt; 13$
arXiv (Cornell University)·2025Open Access
SILVERRUSH. XIV. Ly<i>α</i> Luminosity Functions and Angular Correlation Functions from 20,000 Ly<i>α</i> Emitters at <i>z</i> ∼ 2.2–7.3 from up to 24 deg<sup>2</sup> HSC-SSP and CHORUS Surveys: Linking the Postreionization Epoch to the Heart of Reionization
The Astrophysical Journal Supplement Series·2025· 11 citedOpen Access
The Physical Origin of Extreme Emission Line Galaxies at High Redshifts: Strong [O <scp>iii</scp>] Emission Lines Produced by Obscured Active Galactic Nuclei
The Astrophysical Journal·2025· 3 citedOpen Access
JWST, ALMA, and Keck Spectroscopic Constraints on the UV Luminosity Functions at <i>z</i> ∼ 7–14: Clumpiness and Compactness of the Brightest Galaxies in the Early Universe
The Astrophysical Journal·2025· 58 citedOpen Access
Census of Ly$α$ Emission from $\sim 600$ Galaxies at $z=5-14$: Evolution of the Ly$α$ Luminosity Function and a Late Sharp Cosmic Reionization
arXiv (Cornell University)·2025· 2 citedOpen Access
EMPRESS. X. Spatially resolved mass-metallicity relation in extremely metal-poor galaxies: evidence of episodic star-formation fueled by a metal-poor gas infall
arXiv (Cornell University)·2024Open Access
A Galaxy with an Extremely Blue UV Slope $β=-3$ at $z=9.25$ Identified by JWST Spectroscopy: Evidence for a Weak Nebular Continuum and Efficient Ionizing Photon Escape?
arXiv (Cornell University)·2024· 1 citedOpen Access
SILVERRUSH. XIV. Lya Luminosity Functions and Angular Correlation Functions from ~20,000 Lya Emitters at z~2.2-7.3 from upto 24 ${\rm deg}^2$ HSC-SSP and CHORUS Surveys: Linking the Post-Reionization Epoch to the Heart of Reionization
arXiv (Cornell University)·2024Open Access
Dynamics of a Galaxy at z &gt; 10 Explored by JWST Integral Field Spectroscopy: Hints of Rotating Disk Suggesting Weak Feedback
The Astrophysical Journal·2024· 12 citedOpen Access
The Physical Origin of Extreme Emission Line Galaxies at High redshifts: Strong {\sc [Oiii]} Emission Lines Produced by Obscured AGNs
arXiv (Cornell University)·2024Open Access
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?
The Astrophysical Journal·2024· 9 citedOpen Access
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Frequent Co-authors

Yuichi Harikane(50), Masami Ouchi(49), Yoshiaki Ono(47), Kimihiko Nakajima(46), Yuki Isobe(42), Yechi Zhang(39), Yi Xu(34), Minami Nakane(17), Hidenobu Yajima(16), Takatoshi Shibuya(12), Akio Inoue(10), Hajime Fukushima(10), Hiroto Yanagisawa(10), Akinori Matsumoto(9), Yuma Sugahara(9), Haruka Kusakabe(9), Seiji Fujimoto(9), Ken Mawatari(8), Masato Onodera(8), Chien‐Hsiu Lee(8)