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YZ

Yechi Zhang

0000-0003-3817-8739
astro-ph.GAastro-ph.COastro-ph.IMcosmic dark ageslow-frequency radio astronomylunar-based astronomyultralong wavelength astronomy

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

Preprints & journals

41 papers in the corpus · 2021–2026
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
BEACON: JWST NIRCam Pure-parallel Imaging Survey. IV. A Systematic Search for Galaxy Overdensities and Evidence for Gas Accretion Mode Transition2602.04333v2 · Ryo Albert Sutanto, Takahiro Morishita, Tadayuki Kodama et al.2026 · 1 citationarXiv
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
BEACON: JWST NIRCam Pure-parallel Imaging Survey. II. Physical Properties of z=7−14z=7-14 Galaxies2601.02861v1 · Yechi Zhang, Takahiro Morishita, Kimi C. Kreilgaard et al.2026 · 0 citationsarXiv
A Nitrogen-rich AGN Powering a Large Ionizing Bubble at z=8.632508.01372v2 · Takahiro Morishita, Massimo Stiavelli, Charlotte A. Mason et al.2025 · 3 citationsarXiv
Pristine Massive Star Formation Caught at the Break of Cosmic Dawn2507.10521v3 · Takahiro Morishita, Zhaoran Liu, Massimo Stiavelli et al.2025 · 5 citationsarXiv
The GLASS-JWST Early Release Science Programme: The NIRISS Spectroscopic Catalogue2504.00823v2 · Peter J. Watson, Benedetta Vulcani, Tommaso Treu et al.2025 · 8 citationsA&A 699, A225 (2025)
Potential Nitrogen Enrichment via Direct-Collapse Wolf-Rayet Stars in a z=4.7z=4.7 Star-Forming Galaxy2502.04817v1 · Yechi Zhang, Takahiro Morishita, Massimo Stiavelli2025 · 11 citationsarXiv
What can we learn from the Nitrogen abundance of High-z galaxies?2412.06517v1 · Massimo Stiavelli, Takahiro Morishita, Marco Chiaberge et al.2024 · 25 citationsarXiv
BEACON: JWST NIRCam Pure-parallel Imaging Survey. I. Survey Design and Initial Results2412.04211v2 · Takahiro Morishita, Charlotte A. Mason, Kimi C. Kreilgaard et al.2024 · 25 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
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
Large-scale array for radio astronomy on the farside (LARAF).38522461 · Chen, Xuelei, Gao, Feng, Wu, Fengquan et al.2024 · 22 citationsPhilosophical transactions. Series A, Mathematical, physical, and engineering sciences. 2024;382(2271):20230094
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. 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
A JWST/NIRSpec First Census of Broad-Line AGNs at z=4-7: Detection of 10 Faint AGNs with M_BH~10^6-10^8 M_sun and Their Host Galaxy Properties2303.11946v3 · Yuichi Harikane, Yechi Zhang, Kimihiko Nakajima et al.2023 · 24 citationsarXiv
The Stellar Mass - Black Hole Mass Relation at z∼2z\sim2 Down to MBH∼107M⊙\mathcal{M}_\mathrm{BH}\sim10^7 M_\odot Determined by HETDEX2303.02929v1 · Yechi Zhang, Masami Ouchi, Karl Gebhardt et al.2023 · 19 citationsarXiv
JWST Census for the Mass-Metallicity Star-Formation Relations at z=4-10 with the Self-Consistent Flux Calibration and the Proper Metallicity Calibrators2301.12825v2 · Kimihiko Nakajima, Masami Ouchi, Yuki Isobe et al.2023 · 24 citationsarXiv
Redshift Evolution of the Electron Density in the ISM at z∼0−9z\sim 0-9 Uncovered with JWST/NIRSpec Spectra and Line-Spread Function Determinations2301.06811v2 · Yuki Isobe, Masami Ouchi, Kimihiko Nakajima et al.2023 · 5 citationsarXiv
Cosmological-Scale Lyman-alpha Forest Absorption Around Galaxies and AGN Probed with the HETDEX and SDSS Spectroscopic Data2301.05100v2 · Dongsheng Sun, Ken Mawatari, Masami Ouchi et al.2023 · 2 citationsarXiv
The HETDEX Survey: Emission Line Exploration and Source Classification2301.01799v1 · Dustin Davis, Karl Gebhardt, Erin Mentuch Cooper et al.2023 · 25 citationsarXiv
HETDEX Public Source Catalog 1: 220K Sources Including Over 50K Lyman Alpha Emitters from an Untargeted Wide-area Spectroscopic Survey2301.01826v1 · Erin Mentuch Cooper, Karl Gebhardt, Dustin Davis et al.2023 · 50 citationsarXivon Valency
Morphologies of Galaxies at z≳9z \gtrsim 9 Uncovered by JWST/NIRCam Imaging: Cosmic Size Evolution and an Identification of an Extremely Compact Bright Galaxy at z∼12z\sim 122208.13582v2 · Yoshiaki Ono, Yuichi Harikane, Masami Ouchi et al.2022 · 88 citationsarXiv
A Comprehensive Study on Galaxies at z~9-16 Found in the Early JWST Data: UV Luminosity Functions and Cosmic Star-Formation History at the Pre-Reionization Epoch2208.01612v3 · Yuichi Harikane, Masami Ouchi, Masamune Oguri et al.2022 · 541 citationsarXiv
The Active Galactic Nuclei in the Hobby-Eberly Telescope Dark Energy Experiment Survey (HETDEX) II. Luminosity Function2207.11801v1 · Chenxu Liu, Karl Gebhardt, Erin Mentuch Cooper et al.2022 · 8 citationsarXiv
EMPRESS. IX. Extremely Metal-Poor Galaxies are Very Gas-Rich Dispersion-Dominated Systems: Will JWST Witness Gaseous Turbulent High-z Primordial Galaxies?2206.04709v5 · Yuki Isobe, Masami Ouchi, Kimihiko Nakajima et al.2022 · 10 citationsarXiv
The Active Galactic Nuclei in the Hobby-Eberly Telescope Dark Energy Experiment Survey (HETDEX) I. Sample selection2204.13658v2 · Chenxu Liu, Karl Gebhardt, Erin Mentuch Cooper et al.2022 · 17 citationsarXiv
EMPRESS. VIII. A New Determination of Primordial He Abundance with Extremely Metal-Poor Galaxies: A Suggestion of the Lepton Asymmetry and Implications for the Hubble Tension2203.09617v3 · Akinori Matsumoto, Masami Ouchi, Kimihiko Nakajima et al.2022 · 104 citationsarXiv
The Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) Survey Design, Reductions, and Detections2110.04298v1 · Karl Gebhardt, Erin Mentuch Cooper, Robin Ciardullo et al.2021 · 115 citationsarXiv
First HETDEX Spectroscopic Determinations of Lyα\alpha and UV Luminosity Functions at z=2−3z=2-3: Bridging a Gap Between Faint AGN and Bright Galaxies2105.11497v2 · Yechi Zhang, Masami Ouchi, Karl Gebhardt et al.2021 · 31 citationsarXiv
Career total: 58 works. 41 are in this corpus.

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