Valency Hub
alphaFeedback
YI

Yuki Isobe

0000-0001-7730-8634
astro-ph.GAastro-ph.COastro-ph.SRastro-ph.IM

On Valency

published · living versions
W_pa5453yc·v1 · currentpublished
Tiny Galaxies, Mighty Nitrogen: Linking Chemical Anomalies to Compact Galaxies at High Redshift using JWST/JADES
with Urvi Thakurdesai, Xihan Ji, Roberto Maiolino, Vasily Belokurov +16
1 version

Preprints & journals

65 papers in the corpus · 2020–2026
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
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
The Mysterious Case of Iron in XMPs: Anomalous High log(Fe/O) Observed in Extremely Metal-Poor Galaxies HSCJ1631+4426 and SDSSJ0811+47302607.14758v1 · Aaron Myszka, Themiya Nanayakkara, Karl Glazebrook et al.2026 · 0 citationsarXiv
Globular cluster abundance patterns inherited from giant molecular clouds2607.05509v1 · William McClymont, Vasily Belokurov, Sandro Tacchella et al.2026 · 0 citationsarXiv
Cosmic evolution of the helium and oxygen abundances in type 2 Active Galactic Nuclei: Helium-loud AGNs2606.25890v1 · O. L. Dors, M. Armah, G. F. Hagele et al.2026 · 0 citationsarXiv
JADES: the mass-metallicity relation at z=1−10z=1-10. New calibrations, extremely metal-poor galaxies, and chemical diversity2606.11345v1 · Yuki Isobe, Mirko Curti, Roberto Maiolino et al.2026 · 2 citationsarXiv
JWST Advanced Deep Extragalactic Survey (JADES) Data Release 5: stellar population catalogue for galaxies in GOODS-N and GOODS-S2605.21599v1 · Qiao Duan, Sandro Tacchella, Benjamin D. Johnson et al.2026 · 1 citationarXiv
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
A direct black-hole mass measurement in a little red dot at high redshift.42203931 · Juodžbalis, Ignas, Marconcini, Cosimo, D'Eugenio, Francesco et al.2026 · 19 citationsNature. 2026;653(8116):1017-1021
The Cliff: A Metal-Poor Little Red Dot Hosting an Overmassive Black Hole at z=3.55z = 3.552604.09177v1 · Lucy R. Ivey, Francesco D'Eugenio, Roberto Maiolino et al.2026 · 2 citationsMon Not R Astron Soc (2026)
Holes in the BH⋆^\star? AGN signatures in the FUV spectrum of a black-hole dominated Little Red Dot at z=7.04z=7.042604.03370v1 · Xihan Ji, Gabriele Pezzulli, Francesco D'Eugenio et al.2026 · 1 citationarXiv
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
GA-NIFS and JADES: Confirmation of pristine gas near GN-z112603.20360v2 · Hannah Ubler, Roberto Maiolino, Pablo G. P'erez-Gonz'alez et al.2026 · 2 citationsarXiv
GA-NIFS: Dissecting The Alchemised: JWST reveals turbulent metal-poor gas fuelling a co-spatial starburst in a complex system at z=10.17z=10.172603.00232v3 · Robert G. Pascalau, Francesco D'Eugenio, Roberto Maiolino et al.2026 · 2 citationsMon Not R Astron Soc (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
Bursty star formation, chemical enrichment, and star cluster formation in numerical analogues of GN-z112511.23164v1 · Takayuki R. Saitoh, Yutaka Hirai, Michiko S. Fujii et al.2025 · 0 citationsarXiv
JADES Dark Horse: demonstrating high-multiplex observations with JWST/NIRSpec dense-shutter spectroscopy in the JADES Origins Field2510.11626v2 · Francesco D'Eugenio, Erica J. Nelson, Daniel J. Eisenstein et al.2025 · 4 citationsMon Not R Astron Soc (2026)
Black Holes in the Shadow: The Missing High-Ionization Lines in the Earliest JWST AGNs2510.10772v2 · Greta Zucchi, Xihan Ji, Piero Madau et al.2025 · 1 citationarXiv
BlackTHUNDER: Shedding light on a dormant and extreme little red dot at z=8.502509.20455v2 · Gareth C. Jones, Hannah Ubler, Roberto Maiolino et al.2025 · 9 citationsarXiv
JADES: the chemical enrichment pattern of distant galaxies -- α\alpha enhancement, silicon depletion, and iron enhancement2509.18055v2 · Yuki Isobe, Roberto Maiolino, Xihan Ji et al.2025 · 2 citationsarXiv
The THESAN-ZOOM project: Mystery N/O more -- uncovering the origin of peculiar chemical abundances and a not-so-fundamental metallicity relation at 3<z<123<z<122507.08787v2 · William McClymont, Sandro Tacchella, Aaron Smith et al.2025 · 13 citationsarXiv
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
JADES reveals a large population of low mass black holes at high redshift2506.22147v1 · Sophia Geris, Roberto Maiolino, Yuki Isobe et al.2025 · 17 citationsMon Not R Astron Soc (2025)
JADES and BlackTHUNDER: rest-frame Balmer-line absorption and the local environment in a Little Red Dot at z = 52506.14870v2 · Francesco D'Eugenio, Ignas Juodzbalis, Xihan Ji et al.2025 · 22 citationsarXiv
A black hole in a near-pristine galaxy 700 million years after the Big Bang2505.22567v6 · Roberto Maiolino, Hannah Uebler, Francesco D'Eugenio et al.2025 · 28 citationsMon Not R Astron Soc (2026)
Connecting JWST discovered N/O-enhanced galaxies to globular clusters: Evidence from chemical imprints2505.12505v2 · Xihan Ji, Vasily Belokurov, Roberto Maiolino et al.2025 · 25 citationsarXiv
JADES: comprehensive census of broad-line AGN from Reionization to Cosmic Noon revealed by JWST2504.03551v2 · Ignas Juodzbalis, Roberto Maiolino, William M. Baker et al.2025 · 43 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
JADES: Nitrogen Enhancement in High-Redshift Broad-Line Active Galactic Nuclei2502.12091v2 · Yuki Isobe, Roberto Maiolino, Francesco D'Eugenio et al.2025 · 27 citationsarXiv
BlackTHUNDER -- A non-stellar Balmer break in a black hole-dominated little red dot at z=7.04z=7.042501.13082v2 · Xihan Ji, Roberto Maiolino, Hannah Ubler et al.2025 · 61 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
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
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
Strong He I Emission Lines in High N/O Galaxies at z∼6z \sim 6 Identified in JWST Spectra: High He/H Abundance Ratios or High Electron Densities?2405.01823v2 · Hiroto Yanagisawa, Masami Ouchi, Kuria Watanabe et al.2024 · 2 citationsarXiv
Dynamics of a Galaxy at z > 10 Explored by JWST Integral Field Spectroscopy: Hints of Rotating Disk Suggesting Weak Feedback2404.16963v3 · Yi Xu, Masami Ouchi, Hidenobu Yajima et al.2024 · 17 citationsarXiv
Balmer Decrement Anomalies in Galaxies at z ~ 6 Found by JWST Observations: Density-Bounded Nebulae or Excited H I Clouds?2403.20118v2 · Hiroto Yanagisawa, Masami Ouchi, Kimihiko Nakajima et al.2024 · 22 citationsarXiv
Probing Chemical Enrichment in Extremely Metal-Poor Galaxies2401.06450v3 · Keita Fukushima, Kentaro Nagamine, Akinori Matsumoto et al.2024 · 6 citationsarXiv
Lyα\alpha Emission at z=7−13z=7-13: Clear Lyα\alpha Equivalent Width Evolution Indicating the Late Cosmic Reionization History2312.06804v3 · Minami Nakane, Masami Ouchi, Kimihiko Nakajima et al.2023 · 5 citationsarXiv
Stellar- and AGN-Driven Outflows in JWST Galaxies at z=3-9: More Frequent, Wider Opening Angles, and Mostly Bounded2310.06614v4 · Yi Xu, Masami Ouchi, Kimihiko Nakajima et al.2023 · 23 citationsarXiv
Census for the Rest-frame Optical and UV Morphologies of Galaxies at z=4−10z=4-10: First Phase of Inside-Out Galaxy Formation2309.02790v2 · Yoshiaki Ono, Yuichi Harikane, Masami Ouchi et al.2023 · 23 citationsarXiv
JWST Identification of Extremely Low C/N Galaxies with [N/O]≳0.5\gtrsim 0.5 at z∼6−10z\sim 6-10 Evidencing the Early CNO-Cycle Enrichment and a Connection with Globular Cluster Formation2307.00710v3 · Yuki Isobe, Masami Ouchi, Nozomu Tominaga et al.2023 · 3 citationsarXiv
Statistics for Galaxy Outflows at z∼6−9z\sim 6-9 with Imaging and Spectroscopic Signatures Identified with JWST/NIRCam and NIRSpec Data2306.07940v3 · Yechi Zhang, Masami Ouchi, Kimihiko Nakajima et al.2023 · 1 citationarXiv
JWST Measurements of Neutral Hydrogen Fractions and Ionized Bubble Sizes at z=7−12z=7-12 Obtained with Lyα\alpha Damping Wing Absorptions in 27 Bright Continuum Galaxies2306.00487v3 · Hiroya Umeda, Masami Ouchi, Kimihiko Nakajima et al.2023 · 100 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=0−8z=0-8: Ionizing Spectra Consistent with the Intermediate Mass Black Holes with MBH∼103−106 M⊙M_{\rm BH}\sim 10^3-10^6\ M_\odot2305.02189v2 · Shun Hatano, Masami Ouchi, Hiroya Umeda et al.2023 · 1 citationarXiv
Pure Spectroscopic Constraints on UV Luminosity Functions and Cosmic Star Formation History From 25 Galaxies at zspec=8.61−13.20z_\mathrm{spec}=8.61-13.20 Confirmed with JWST/NIRSpec2304.06658v4 · Yuichi Harikane, Kimihiko Nakajima, Masami Ouchi et al.2023 · 16 citationsarXiv
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
Career total: 84 works. 65 are in this corpus.Showing the 50 most recent.

Profile built from the corpus for this byline.

Author records are still filling in while the Hub is in alpha. If this is your page, you'll be able to claim it soon. Spot a mistake? Tell us.