Masami Ouchi

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

Physics and Astronomy · Physical Sciences

75h-index20.9kcitations465works8.52yr avg
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Research Topics

Galaxies: Formation, Evolution, Phenomena(315), Astronomy and Astrophysical Research(269), Stellar, planetary, and galactic studies(114), Gamma-ray bursts and supernovae(95), Astrophysics and Star Formation Studies(77)

Publications465 total

Cosmic Himalayas in CROCODILE : Probing the Extreme Quasar Overdensities by Count-in-Cells analysis and Nearest Neighbor Distribution
arXiv (Cornell University)·2025Open Access
Cosmic Himalayas in CROCODILE : Probing the Extreme Quasar Overdensities by Count-in-Cells analysis and Nearest Neighbor Distribution
ArXiv.org·2025Open Access
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
Fe Abundances of Early Galaxies at <i>z</i> = 9–12 Derived with Deep JWST Spectra
The Astrophysical Journal·2025· 2 citedOpen Access
JWST and ALMA Joint Analysis with [O <scp>II</scp> ] <i>λλ</i> 3726, 3729, [O <scp>III</scp> ] <i>λ</i> 4363, [O <scp>III</scp> ] 88 <i>μ</i> m, and [O <scp>III</scp> ] 52 <i>μ</i> m: Multizone Evolution of Electron Densities at <i>z</i>  ∼ 0–14 and its Impact on Metallicity Measurements
The Astrophysical Journal·2025· 5 citedOpen Access
Galaxy Protoclusters as Drivers of Cosmic Reionization: I. Bubble Overlap at Redshift z ~ 7 in LAGER-z7OD1
arXiv (Cornell University)·2025Open Access
Morphological Demographics of Galaxies at <i>z</i> ∼ 10–16: Log-normal Size Distribution and Exponential Profiles Consistent with the Disk Formation Scenario
The Astrophysical Journal·2025· 5 citedOpen Access
ALMA Lensing Cluster Survey: Physical Characterization of Near-infrared-dark Intrinsically Faint ALMA Sources at <i>z</i> = 2–4
The Astrophysical Journal·2025· 2 citedOpen Access
Primordial rotating disk composed of at least 15 dense star-forming clumps at cosmic dawn
Nature Astronomy·2025· 20 citedOpen 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
Probing Chemical Enrichment in Extremely Metal-poor Galaxies
The Astrophysical Journal·2025Open Access
EMPRESS. XV. A New Determination of the Primordial Helium Abundance Suggesting a Moderately Low $Y_\mathrm{P}$ Value
arXiv (Cornell University)·2025Open Access
An Ultra-Faint, Chemically Primitive Galaxy Forming at the Epoch of Reionization
ArXiv.org·2025· 2 citedOpen Access
Cosmic Himalayas: The Highest Quasar Density Peak Identified in a 10,000 deg<sup>2</sup> Sky with Spatial Discrepancies between Galaxies, Quasars, and IGM H<scp> i</scp>
The Astrophysical Journal·2025· 1 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
JWST &amp; ALMA Joint Analysis with [OII]$λλ$3726,3729, [OIII]$λ$4363, [OIII]88$μ$m, and [OIII]52$μ$m: Multi-Zone Evolution of Electron Densities at $\mathbf{z\sim0-14}$ and Its Impact on Metallicity Measurements
arXiv (Cornell University)·2025· 1 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
ChemicalUniverseMachine. I. Uncovering the Cosmic Evolution of Metals in the Galaxy–Interstellar Medium–Circumgalactic Medium Ecosystem
The Astrophysical Journal·2025· 1 citedOpen Access
SAPPHIRES: A Galaxy Over-Density in the Heart of Cosmic Reionization at $z=8.47$
arXiv (Cornell University)·2025· 3 citedOpen Access
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Frequent Co-authors

Kazuhiro Shimasaku(26), Yoshiaki Ono(24), Hisanori Furusawa(19), Nobunari Kashikawa(19), Sadanori Okamura(17), Masanori Iye(14), Tōru Yamada(13), Yuichi Matsuda(13), Yutaka Komiyama(12), Yuichi Harikane(12), Satoshi Miyazaki(11), Takatoshi Shibuya(11), Yoshiaki Taniguchi(11), Mamoru Doi(10), Masayuki Akiyama(10), Kimihiko Nakajima(10), Tohru Nagao(10), Tadayuki Kodama(9), Naoki Yasuda(8), M. Yoshida(8)