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Masami Ouchi

0000-0002-1049-6658
astro-ph.GAastro-ph.COastro-phastro-ph.IMastro-ph.HEastro-ph.SRastro-ph.EPgr-qc

On Valency

published · living versions
W_kppczsme·v1 · currentpublished
HETDEX Public Source Catalog 1: 220K Sources Including Over 50K Lyman Alpha Emitters from an Untargeted Wide-area Spectroscopic Survey
with Erin Mentuch Cooper, Karl Gebhardt, Dustin Davis, Daniel J. Farrow +41
1 version
W_tt9ub9hz·v1published
Extragalactic Science, Cosmology and Galactic Archaeology with the Subaru Prime Focus Spectrograph (PFS)
W_s5n85pp4·v1published
Very Compact Dense Galaxy Overdensity with δ ~ 130 Identified at z ~ 8: Implications for Early Protocluster and Cluster-Core Formation

Preprints & journals

282 papers in the corpus · 1999–2026
Can Blue UV-Bright Galaxies Drive Reionization at Cosmic Dawn? An MUV=−19.6M_{\rm UV}=-19.6 Galaxy with fesc≈0.85f_{\rm esc}\approx0.85 at z=9.244z=9.2442610.24092v1 · Yunjing Wu, Sijia Cai, Yongda Zhu et al.2026 · 0 citationsarXiv
Constraining reionization with persistent homology: a novel summary statistic for wide-field Lyman-α\alpha emitter observations2609.36092v2 · Michael M. Wyatt, Nikolaos Triantafyllou, Steven R. Furlanetto et al.2026 · 0 citationsarXiv
SN Helios: A Multiply Imaged Type II Supernova Opening Time-Delay Cosmography beyond redshift of 32609.30440v2 · Seiji Fujimoto, Conor Larison, Justin D. R. Pierel et al.2026 · 0 citationsarXiv
LATED: Lyα\alpha-anchored photometric selection of candidate metal-free and extremely metal-poor star formation from the end of reionisation to cosmic noon2609.24588v1 · Mingyu Li, Zheng Cai, Roberto Maiolino et al.2026 · 0 citationsarXiv
LATED: JWST integral field spectroscopy of a galaxy caught in chemical infancy at z=4.8z=4.8 behind Abell 27442609.24589v1 · Mingyu Li, Roberto Maiolino, Zheng Cai et al.2026 · 0 citationsarXiv
The Roman eXtreme Deep Field (RXDF)2609.08145v1 · Haojing Yan, Anton M. Koekemoer, Yue Shen et al.2026 · 0 citationsarXiv
ATLAS. IV. A JWST+MUSE Demographic Study of Lyα\alpha Profiles in Little Red Dots2608.14534v1 · Yuta Kageura, Masami Ouchi, Hiroto Yanagisawa et al.2026 · 0 citationsarXiv
Why is GN-z11 Bright, Compact, and Nitrogen Enhanced? Insights from UV Absorption and Emission Diagnostics2608.12466v3 · Minami Nakane, Masami Ouchi2026 · 0 citationsarXiv
ATLAS. III. Dust Around Little Red Dots: Hydrogen Line Ratios beyond Dust-free Non-Case B Models2608.10832v2 · Tomokazu Kiyota, Masami Ouchi, Hiroto Yanagisawa et al.2026 · 0 citationsarXiv
ATLAS. II. Extremely High Incidence of Balmer Line Absorption with Predominant Blueshifts in LRDs: Statistical Insights through Comparison with Type 1 AGNs2607.26269v1 · Hiroto Yanagisawa, Masami Ouchi, Tomokazu Kiyota et al.2026 · 0 citationsarXiv
Gas-Phase Metallicity and Nitrogen Abundances in Low-Mass Galaxies Down to M⋆≃105.7 M⊙M_\star\simeq10^{5.7}\,M_\odot at z≃4.5z\simeq4.5--10.110.1 from JWST Lensing Cluster Surveys2607.15515v1 · Hiroya Umeda, Masami Ouchi, Kimihiko Nakajima et al.2026 · 0 citationsarXiv
VENUS: an ultra-faint galaxy hosting the metal-poor type II supernova at z=5.13z=5.13 Witnessing the initial metal enrichment with extremely frequent core-collapse supernovae?2607.14355v1 · Yoshihisa Asada, Seiji Fujimoto, Joseph F. V. Allingham et al.2026 · 0 citationsarXiv
ATLAS. I. A Scaling Relation of LRDs between Broad Hα\alpha and Bolometric Luminosities: Enhanced Broad Hα\alpha Emission Relative to Low-zz Type 1 AGN2606.09726v2 · Hiroto Yanagisawa, Masami Ouchi, Tomokazu Kiyota et al.2026 · 0 citationsarXiv
JWST Absorption-Line Analysis of UV-Bright Galaxies at z=7.2−10.6z=7.2-10.6: Early Chemical Enrichment Traced by C, O, Mg, Al, Si, and Fe2606.08782v3 · Minami Nakane, Masami Ouchi2026 · 0 citationsarXiv
HETDEX Public Data Release 1: Source Catalog 2 and Data Cubes from ~90 sq deg of Integral-Field Optical Spectroscopy2606.04208v1 · Erin Mentuch Cooper, Karl Gebhardt, Dustin Davis et al.2026 · 2 citationsApJS, 284, 67 (2026)
SDSS+JWST Census of Stellar and Nebular Dust Attenuation at z∼0z \sim 0-7: Mass Dependence and Redshift Evolution2605.23049v1 · Jie Song, Masami Ouchi, Tomokazu Kiyota et al.2026 · 0 citationsarXiv
DREAMS. JWST Spectroscopy of a z=8.3z=8.3 Galaxy with an ALMA Dust Continuum Detection: Early Dust, Very High TdustT_{\rm dust}, and a Multi-wavelength [OIII] Ratio Discrepancy2605.14922v1 · Kana Takechi, Masami Ouchi, Kimihiko Nakajima et al.2026 · 0 citationsarXiv
An ultra-faint, chemically primitive galaxy forming in the reionization era.42129526 · Nakajima, Kimihiko, Ouchi, Masami, Harikane, Yuichi et al.2026 · 17 citationsNature. 2026;653(8114):363-367
Chemical Abundance Ratios of Nitrogen Rich Galaxies Identified at z∼6−12z\sim 6-12: Observational Demographics and Models2603.21570v2 · Kuria Watanabe, Masami Ouchi, Kimihiko Nakajima et al.2026 · 0 citationsarXiv
Ly{\alpha} Nebulae in HETDEX: The Largest Statistical Census Bridging Ly{\alpha} Halos and Blobs across Cosmic Noon2603.06410v1 · Erin Mentuch Cooper, Karl Gebhardt, Dustin Davis et al.2026 · 5 citationsApJ, 1000, 38 (2026)
A UV-Luminous Galaxy at z=11 with Surprisingly Weak Star Formation Activity2601.21833v1 · Yuichi Harikane, Pablo G. Perez-Gonzalez, Javier Alvarez-Marquez et al.2026 · 0 citationsarXiv
JWST Spectroscopic Census of ALMA Faint Submillimeter Galaxies in the Hubble Ultra Deep Field2601.18149v2 · Tomokazu Kiyota, Masami Ouchi, Daisuke Iono et al.2026 · 0 citationsarXiv
A New Constraint on the Optical Depth from the Reionization History Independent of CMB Large-Scale E-Mode Polarization2601.09644v2 · Yuta Kageura, Masami Ouchi, Fumihiro Naokawa et al.2026 · 0 citationsarXiv
VENUS: Two Faint Little Red Dots Separated by ∼70 pc\sim70\,\mathrm{pc} Hidden in a Single Lensed Galaxy at z∼7z\sim72601.06015v1 · Hiroto Yanagisawa, Masami Ouchi, Miriam Golubchik et al.2026 · 2 citationsarXiv
A spectroscopically confirmed, strongly lensed, metal-poor Type II supernova at z = 5.132601.04156v2 · David A. Coulter, Conor Larison, Justin D. R. Pierel et al.2026 · 0 citationsarXiv
Cosmic Himalayas in CROCODILE : Probing the Extreme Quasar Overdensities by Count-in-Cells analysis and Nearest Neighbor Distribution2512.24966v2 · Yuto Kuwayama, Yongming Liang, Kentaro Nagamine et al.2025 · 0 citationsarXiv
DREAMS.II. Galaxy Demographics from Direct Te-Based Metallicities at z~2-10: Tracing the Evolution of the Mass-Metallicity and Fundamental Relations2512.12983v1 · Moka Nishigaki, Kimihiko Nakajima, Masami Ouchi et al.2025 · 0 citationsarXiv
Little red dot variability over a century reveals black hole envelope via a giant Einstein cross2512.05180v1 · Zijian Zhang, Mingyu Li, Masamune Oguri et al.2025 · 2 citationsarXiv
Galaxy Protoclusters as Drivers of Cosmic Reionization: I. Bubble Overlap at Redshift z ~ 7 in LAGER-z7OD12510.13140v2 · Crystal L. Martin, Weida Hu, Isak G. B. Wold et al.2025 · 3 citationsarXiv
Ly{\alpha} Intensity Mapping in HETDEX: Galaxy-Ly{\alpha} Intensity Cross-Power Spectrum2510.11427v2 · Maja Lujan Niemeyer, Eiichiro Komatsu, Jos'e Luis Bernal et al.2025 · 2 citationsApJ 999 177 (2026)
EMPRESS. XV. A New Determination of the Primordial Helium Abundance Suggesting a Moderately Low YPY_\mathrm{P} Value2506.24050v3 · Hiroto Yanagisawa, Masami Ouchi, Akinori Matsumoto et al.2025 · 0 citationsarXiv
JWST & ALMA Joint Analysis with [OII]$\lambda\lambda3726,3729,[OIII]3726,3729, [OIII]\lambda4363,[OIII]884363, [OIII]88\mum,and[OIII]52m, and [OIII]52\mu$m: Multi-Zone Evolution of Electron Densities at z∼0−14\mathbf{z\sim0-14} and Its Impact on Metallicity Measurements2505.09186v2 · Yuichi Harikane, Ryan L. Sanders, Richard Ellis et al.2025 · 2 citationsarXiv
SAPPHIRES: Extremely Metal-Poor Galaxy Candidates with 12+log(O/H)<7.012+{\rm log(O/H)}<7.0 at z∼5−7z\sim5-7 from Deep JWST/NIRCam Grism Observations2505.03873v1 · Tiger Yu-Yang Hsiao, Fengwu Sun, Xiaojing Lin et al.2025 · 4 citationsarXiv
Probing the Cosmic Reionization History with JWST: Gunn-Peterson and Lyα\alpha Damping Wing Absorption at 4.5<z<134.5 < z < 132504.04683v2 · Hiroya Umeda, Masami Ouchi, Yuta Kageura et al.2025 · 1 citationarXiv
Comprehensive JWST+ALMA Study on the Extended Lyα\alpha Emitters, Himiko and CR7 at z∼7z\sim 7: Blue Major Merger Systems in Stark Contrast to Submillimeter Galaxies2504.03156v2 · Tomokazu Kiyota, Masami Ouchi, Yi Xu et al.2025 · 1 citationarXiv
Slitless Areal Pure-Parallel HIgh-Redshift Emission Survey (SAPPHIRES): Early Data Release of Deep JWST/NIRCam Images and Spectra in MACS J0416 Parallel Field2503.15587v1 · Fengwu Sun, Yoshinobu Fudamoto, Xiaojing Lin et al.2025 · 3 citationsarXiv
SAPPHIRES: A Galaxy Over-Density in the Heart of Cosmic Reionization at z=8.47z=8.472503.15597v1 · Yoshinobu Fudamoto, Jakob M. Helton, Xiaojing Lin et al.2025 · 4 citationsarXiv
ChemicalUniverseMachine I: Uncovering the Cosmic Evolution of Metals in the Galaxy-ISM-CGM Ecosystem2503.10999v2 · Moka Nishigaki, Peter Behroozi, Masami Ouchi et al.2025 · 0 citationsarXiv
Fe Abundances of Early Galaxies at z=9−12z=9-12 Derived with Deep JWST Spectra2503.11457v3 · Minami Nakane, Masami Ouchi, Kimihiko Nakajima et al.2025 · 12 citationsarXiv
Morphological Demographics of Galaxies at z∼10−16z\sim 10-16: Log-Normal Size Distribution and Exponential Profiles Consistent with the Disk Formation Scenario2502.08885v2 · Yoshiaki Ono, Masami Ouchi, Yuichi Harikane et al.2025 · 1 citationarXiv
Census of Lyα\alpha Emission from ∼600\sim 600 Galaxies at z=5−14z=5-14: Evolution of the Lyα\alpha Luminosity Function and a Late Sharp Cosmic Reionization2501.05834v3 · Yuta Kageura, Masami Ouchi, Minami Nakane et al.2025 · 2 citationsarXiv
EMPRESS. X. Spatially resolved mass-metallicity relation in extremely metal-poor galaxies: evidence of episodic star-formation fueled by a metal-poor gas infall2412.04541v1 · Kimihiko Nakajima, Masami Ouchi, Yuki Isobe et al.2024 · 0 citationsarXiv
A Galaxy with an Extremely Blue UV Slope β=−3\beta=-3 at z=9.25z=9.25 Identified by JWST Spectroscopy: Evidence for a Weak Nebular Continuum and Efficient Ionizing Photon Escape?2411.19893v3 · Hiroto Yanagisawa, Masami Ouchi, Kimihiko Nakajima et al.2024 · 1 citationarXiv
SILVERRUSH. XIV. Lya Luminosity Functions and Angular Correlation Functions from ~20,000 Lya Emitters at z~2.2-7.3 from upto 24 deg2{\rm deg}^2 HSC-SSP and CHORUS Surveys: Linking the Post-Reionization Epoch to the Heart of Reionization2411.15495v1 · Hiroya Umeda, Masami Ouchi, Satoshi Kikuta et al.2024 · 0 citationsarXiv
The Physical Origin of Extreme Emission Line Galaxies at High redshifts: Strong {\sc [Oiii]} Emission Lines Produced by Obscured AGNs2410.12198v2 · Chenghao Zhu, Yuichi Harikane, Masami Ouchi et al.2024 · 0 citationsarXiv
Euclid preparation. The Cosmic Dawn Survey (DAWN) of the Euclid Deep and Auxiliary Fields2408.05275v3 · C. J. R. McPartland, L. Zalesky, J. R. Weaver et al.2024 · 16 citationsA&A 695, A259 (2025)
Low [O/Fe] Ratio in a Luminous Galaxy at the Early Cosmic Epoch (z>10z>10): Signature of Short Delay Time or Bright Hypernovae/Pair-Instability Supernovae?2407.14470v3 · Minami Nakane, Masami Ouchi, Kimihiko Nakajima et al.2024 · 8 citationsarXiv
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 Universe2406.18352v2 · Yuichi Harikane, Akio K. Inoue, Richard S. Ellis et al.2024 · 102 citationsarXiv
ALMA Lensing Cluster Survey: Physical characterization of near-infrared-dark intrinsically faint ALMA sources at z=2-42406.09890v2 · Akiyoshi Tsujita, Kotaro Kohno, Shuo Huang et al.2024 · 2 citationsarXiv
The MUSE eXtremely Deep Field: Detections of circumgalactic SiII* emission at z>~22406.04399v2 · Haruka Kusakabe, Valentin Mauerhofer, Anne Verhamme et al.2024 · 6 citationsA&A 691, A255 (2024)
Career total: at least 529 works. 282 are in this corpus.Showing the 50 most recent.

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