Yuma Sugahara

0000-0001-6958-7856

astro-ph.GAastro-ph.COastro-ph.IMastro-ph.SRastro-ph.EPastro-ph.HE

On Valency

published · living versions

W_unu28bt7·v1 · currentpublished

Why a Multi-Cycle Treasury Program is Essential to Maximize JWST's Scientific Contributions to Galaxy Formation

with Genesis Community, Alice Shapley, Steven L. Finkelstein, Rachel S. Somerville +416

1 version

Preprints & journals

74 papers in the corpus · 2017–2026

The dawn of the first galaxies2610.20733v2 · Livia Vallini, Tanio Diaz Santos, Belen Alcalde Pampliega et al.2026 · 0 citationsarXiv

PEGASUS (Pfs Emission-line GAlaxy SUrvey with Subaru): II. Metal Poor AGNs in High Equivalent-Width Narrow-Band Emitters2609.34150v1 · Hisakazu Uchiyama, Tohru Nagao, Mariko Kubo et al.2026 · 0 citationsarXiv

PEGASUS (Pfs Emission-line GAlaxy SUrvey with Subaru): I. Three-dimensional large-scale structures at

z > 1

probed with emission-line galaxies2609.25455v1 · Mariko Kubo, Tadayuki Kodama, Rhythm Shimakawa et al.2026 · 0 citationsarXiv

SERENADE III: Insight into the Origin of the High Dust Temperature and High [O III]/[C II] Ratio at

z\gtrsim6

2608.26708v1 · Ikki Mitsuhashi, Yuichi Harikane, Hiddo S. B. Algera et al.2026 · 0 citationsarXiv

Diversity of Ionized Gas Structures in Nearby Metal-poor Dwarf Galaxies2608.19667v1 · Yuki Takagishi, Takuya Hashimoto, Kazuya Matsubayashi et al.2026 · 0 citationsarXiv

RIOJA. Environmental Effects on Stellar Populations and Ionized Gas in a Protocluster at

z=7.88

2608.16343v1 · Wataru Osone, Takuya Hashimoto, Javier 'Alvarez-M'arquez et al.2026 · 0 citationsarXiv

ALMA observations of pre-JWST z ~ 10 galaxy candidates: A CO(J = 9-8) line from a ULIRG at z = 2.54 and revisit of the photometric redshifts with JWST photometry2608.12708v1 · Suzuka Arai, Yuma Sugahara, Akio K. Inoue et al.2026 · 0 citationsarXiv

Breathing Fire: Hot Dust in the Big Three Dragons at z = 7.152608.08015v1 · Gitanjali Rajulal, Hiddo S. B. Algera, Yuma Sugahara et al.2026 · 0 citationsarXiv

Assessing the Impact of Source Confusion for GREX-PLUS based on Deep JWST NIRCam Imaging2605.17882v1 · Yoshiaki Ono, Akio K. Inoue, Yuma Sugahara et al.2026 · 0 citationsarXiv

PRISMS. U37126, a very blue, ISM-naked starburst at z=10.255 with nearly 100% Lyman continuum escape fraction2602.02322v2 · R. Marques-Chaves, J. 'Alvarez-M'arquez, L. Colina et al.2026 · 1 citationarXiv

PRISMS. UNCOVER-26185, a metal-poor SFG at z=10.05 with no evidence for a X-ray-luminous AGN2602.02323v1 · J. 'Alvarez-M'arquez, L. Colina, A. Crespo-Gomez et al.2026 · 0 citationsarXiv

A first systematic study of [OIII] 88

\mu

m at

z>8

: two luminous oxygen lines and a powerful ionized outflow in the first 600 million years2512.14486v2 · Hiddo S. B. Algera, John R. Weaver, Tom J. L. C. Bakx et al.2025 · 1 citationarXiv

RIOJA. Young Starburst and Ionized Gas Outflows in a

z = 7.212

Galaxy Uncovered by JWST NIRCam and NIRSpec Observations2510.25721v1 · Yi W. Ren, Akio K. Inoue, Javier 'Alvarez-M'arquez et al.2025 · 4 citationsarXiv

Early massive galaxy formation in the core of a galaxy protocluster 650 million years after the Big Bang2510.11770v1 · Yoshinobu Fudamoto, Yurina Nakazato, Daniel Ceverino et al.2025 · 0 citationsarXiv

ELPIS: Accelerated metal and dust enrichment in a proto-cluster core at

z\approx8

2510.11788v1 · Hideki Umehata, Yoichi Tamura, Yoshinobu Fudamoto et al.2025 · 0 citationsarXiv

RIOJA. A Clumpy Galaxy Assembly at Redshift 6.81 Revealed by JWST2507.02053v2 · Ken Mawatari, Luca Costantin, Mitsutaka Usui et al.2025 · 3 citationsarXiv

RIOJA. JWST and ALMA unveil the inhomogeneous and complex ISM structure in a star-forming galaxy at

z=6.81

2507.02054v2 · Mitsutaka Usui, Ken Mawatari, Javier 'Alvarez-M'arquez et al.2025 · 0 citationsarXiv

EMPRESS. XV. A New Determination of the Primordial Helium Abundance Suggesting a Moderately Low

Y_\mathrm{P}

Value2506.24050v3 · Hiroto Yanagisawa, Masami Ouchi, Akinori Matsumoto et al.2025 · 0 citationsarXiv

Compact Ionized Gas Region Surrounded by Porous Neutral Gas in a Dusty Lyman Break Galaxy at Redshift

z=8.312

2506.20734v1 · Masato Hagimoto, Yoichi Tamura, Akio K. Inoue et al.2025 · 3 citationsarXiv

The first direct imaging of the silhouette of a damped Lyman

\alpha

system along the line-of-sight to a background galaxy2505.14293v2 · Fuga Komori, Akio K. Inoue, Ken Mawatari et al.2025 · 0 citationsarXiv

A Cosmic Miracle: A Remarkably Luminous Galaxy at

z_{\rm{spec}}=14.44

Confirmed with JWST2505.11263v2 · Rohan P. Naidu, Pascal A. Oesch, Gabriel Brammer et al.2025 · 13 citationsarXiv

ALMA Observations of [OI]145um and [NII]205um Emission lines from Star-Forming Galaxies at

z\sim7

2504.03831v1 · Yoshinobu Fudamoto, Akio K. Inoue, Rychard Bouwens et al.2025 · 1 citationarXiv

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

JWST/NIRSpec spectroscopy of intermediate-mass quiescent galaxies at

z \sim 3-4

2410.08745v1 · Riku A. Sato, Akio K. Inoue, Yuichi Harikane et al.2024 · 11 citationsarXiv

Detection of the [O I] 63

\mu

m emission line from the

z = 6.04

quasar J2054-00052408.09944v3 · Nozomi Ishii, Takuya Hashimoto, Carl Ferkinhoff et al.2024 · 8 citationsarXiv

Gas conditions of a star-formation selected sample in the first billion years2406.19439v1 · Tom J. L. C. Bakx, Hiddo S. B. Algera, Bram Venemans et al.2024 · 15 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

CLASSY X: Highlighting Differences Between Partial Covering and Semi-Analytic Modeling in the Estimate of Galactic Outflow Properties2406.03646v2 · M. Huberty, C. Carr, C. Scarlata et al.2024 · 0 citationsarXiv

RIOJA. Complex Dusty Starbursts in a Major Merger B14-65666 at z=7.152403.17133v3 · Yuma Sugahara, Javier 'Alvarez-M'arquez, Takuya Hashimoto et al.2024 · 10 citationsarXiv

The ALPINE-ALMA [C II] survey: Characterisation of Spatial Offsets in Main-Sequence Galaxies at

z \sim

4-62402.07982v1 · Meghana Killi, Michele Ginolfi, Gergo Popping et al.2024 · 0 citationsarXiv

Revisiting the Dragonfly Galaxy II. Young, radiatively efficient radio-loud AGN drives massive molecular outflow in a starburst merger at z=1.922312.09649v2 · Yuxing Zhong, Akio K. Inoue, Yuma Sugahara et al.2023 · 10 citationsarXiv

SERENADE II: An ALMA Multi-Band Dust-Continuum Analysis of 28 Galaxies at

5<z<8

and the Physical Origin of the Dust Temperature Evolution2311.16857v1 · Ikki Mitsuhashi, Yuichi Harikane, Franz E. Bauer et al.2023 · 2 citationsarXiv

Molecular outflow in the reionization-epoch quasar J2054-0005 revealed by OH 119

\mu

m observations2307.02104v2 · Dragan Salak, Takuya Hashimoto, Akio K. Inoue et al.2023 · 20 citationsarXiv

CLASSY VIII: Exploring the Source of Ionization with UV ISM diagnostics in local High-

z

Analogs2306.15062v2 · Matilde Mingozzi, Bethan L. James, Danielle A. Berg et al.2023 · 0 citationsarXiv

Reionization and the ISM/Stellar Origins with JWST and ALMA (RIOJA): The core of the highest redshift galaxy overdensity at

z = 7.88

confirmed by NIRSpec/JWST2305.04741v2 · Takuya Hashimoto, Javier 'Alvarez-M'arquez, Yoshinobu Fudamoto et al.2023 · 48 citationsarXiv

Revisiting the Dragonfly Galaxy I. High-resolution ALMA and VLA Observations of the Radio Hotspots in a Hyper-luminous Infrared Galaxy at

z=1.92

2305.03979v1 · Yuxing Zhong, Akio K. Inoue, Yuma Sugahara et al.2023 · 3 citationsarXiv

EMPRESS. XIII. Chemical Enrichments of Young Galaxies Near and Far at z ~ 0 and 4-10: Fe/O, Ar/O, S/O, and N/O Measurements with Chemical Evolution Model Comparisons2305.02078v4 · Kuria Watanabe, Masami Ouchi, Kimihiko Nakajima et al.2023 · 0 citationsarXiv

EMPRESS. XIV. Strong High Ionization Lines of Young Galaxies at

z=0-8

: Ionizing Spectra Consistent with the Intermediate Mass Black Holes with

M_{\rm BH}\sim 10^3-10^6\ M_\odot

2305.02189v2 · Shun Hatano, Masami Ouchi, Hiroya Umeda et al.2023 · 1 citationarXiv

Near-infrared Variability Detected in the Young Star-Forming Dwarf Galaxy SBS 0335-052E2304.03726v3 · Shun Hatano, Mitsuru Kokubo, Masami Ouchi et al.2023 · 3 citationsarXiv

EMPRESS. XII. Statistics on the Dynamics and Gas Mass Fraction of Extremely-Metal Poor Galaxies2303.12467v2 · Yi Xu, Masami Ouchi, Yuki Isobe et al.2023 · 8 citationsThe Astrophysical Journal, Volume 961, Number 1, January 2024, Page 49-53

The 300 pc resolution imaging of a z = 8.31 galaxy: Turbulent ionized gas and potential stellar feedback 600 million years after the Big Bang2303.11539v2 · Yoichi Tamura, Tom J. L. C. Bakx, Akio K. Inoue et al.2023 · 21 citationsarXiv

Detections of [C II] 158

\mu

m and [O III] 88

\mu

m in a Local Lyman Continuum Emitter, Mrk 54, and its Implications to High-redshift ALMA Studies2303.11036v1 · Ryota Ura, Takuya Hashimoto, Akio K. Inoue et al.2023 · 6 citationsarXiv

The Extended [CII] under Construction? Observation of the brightest high-z lensed star-forming galaxy at z = 6.22303.07513v1 · Yoshinobu Fudamoto, Akio K. Inoue, Dan Coe et al.2023 · 8 citationsarXiv

Updated measurements of [O III] 88

\mu

m, [C II] 158

\mu

m, and Dust Continuum Emission from a z=7.2 Galaxy2302.02365v2 · Yi W. Ren, Yoshinobu Fudamoto, Akio K. Inoue et al.2023 · 12 citationsarXiv

CLASSY VI: Density, Structure and Size of Galactic Outflows2301.11498v1 · Xinfeng Xu, Timothy Heckman, Alaina Henry et al.2023 · 0 citationsarXiv

JWST and ALMA Multiple-Line Study in and around a Galaxy at

z=8.496

: Optical to FIR Line Ratios and the Onset of an Outflow Promoting Ionizing Photon Escape2212.06863v3 · Seiji Fujimoto, Masami Ouchi, Kimihiko Nakajima et al.2022 · 3 citationsarXiv

Identification of Large Equivalent Width Dusty Galaxies at 4

<

<

6 from Sub-mm Colours2211.05744v1 · Denis Burgarella, Patrice Theul'e, V'eronique Buat et al.2022 · 4 citationsA&A 671, A123 (2023)

ALMA Observations for CO Emission from Luminous Lyman-break Galaxies at

z=6.0293

6.2037

2211.00793v1 · Yoshiaki Ono, Seiji Fujimoto, Yuichi Harikane et al.2022 · 6 citationsarXiv

CLASSY IV: Exploring UV diagnostics of the interstellar medium in local high-

z

analogs at the dawn of the JWST era2209.09047v2 · Matilde Mingozzi, Bethan L. James, Karla Z. Arellano-C'ordova et al.2022 · 83 citationsarXiv

Red Spiral Galaxies in the Cosmic Noon Unveiled in the First JWST Image2208.00132v2 · Yoshinobu Fudamoto, Akio K. Inoue, Yuma Sugahara2022 · 0 citationsarXiv

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