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Articles by Kimihiko Nakajima

New Methods of Identifying AGN in the Early Universe using Spectroscopy and Photometry in the JWST Era
2 days ago by Flor Arevalo Gonzalez and others
Astrophysics of Galaxies
Census of Lyα Emission from \sim 600 Galaxies at z=5-14: Evolution of the Lyα Luminosity Function and a Late Sharp Cosmic Reionization
10 January 2025 by Yuta Kageura and others
Astrophysics of Galaxies
EMPRESS. X. Spatially resolved mass-metallicity relation in extremely metal-poor galaxies: evidence of episodic star-formation fueled by a metal-poor gas infall
5 December 2024 by Kimihiko Nakajima and others
Astrophysics of Galaxies
A Galaxy with an Extremely Blue UV Slope β=-3 at z=9.25 Identified by JWST Spectroscopy: Evidence for a Weak Nebular Continuum and Efficient Ionizing Photon Escape?
29 November 2024 by Hiroto Yanagisawa and others
Astrophysics of Galaxies
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 Universe
29 November 2024 by Yuichi Harikane and others
Astrophysics of Galaxies
Stellar and AGN Feedback Probed with Outflows in JWST Galaxies at z=3-9: Implications of More Spherical Galactic Fountains
25 November 2024 by Yi Xu and others at LogoNational Astronomical Observatory of Japan
Astrophysics of Galaxies
A luminous and young galaxy at z=12.33 revealed by a JWST/MIRI detection of Hα and [OIII]
6 November 2024 by Jorge Zavala and others
Astrophysics of Galaxies, Instrumentation and Methods for Astrophysics
Thirty Meter Telescope International Observatory Detailed Science Case 2024
31 October 2024 by Warren Skidmore and others
Instrumentation and Methods for Astrophysics, Cosmology and Nongalactic Astrophysics
The Physical Origin of Extreme Emission Line Galaxies at High redshifts: Strong {\sc [Oiii]} Emission Lines Produced by Obscured AGNs
16 October 2024 by Chenghao Zhu and others
Astrophysics of Galaxies
Dynamics of a Galaxy at z > 10 Explored by JWST Integral Field Spectroscopy: Hints of Rotating Disk Suggesting Weak Feedback
9 October 2024 by Yi Xu and others
Astrophysics of Galaxies
Low [O/Fe] Ratio in a Luminous Galaxy at the Early Cosmic Epoch (z>10): Signature of Short Delay Time or Bright Hypernovae/Pair-Instability Supernovae?
7 October 2024 by Minami Nakane and others
Astrophysics of Galaxies
Strong He I Emission Lines in High N/O Galaxies at z \sim 6 Identified in JWST Spectra: High He/H Abundance Ratios or High Electron Densities?
25 August 2024 by Hiroto Yanagisawa and others
Astrophysics of Galaxies
Balmer Decrement Anomalies in Galaxies at z ~ 6 Found by JWST Observations: Density-Bounded Nebulae or Excited H I Clouds?
25 August 2024 by Hiroto Yanagisawa and others
Astrophysics of Galaxies
New AGN diagnostic diagrams based on the [OIII]λ4363 auroral line
1 August 2024 by Giovanni Mazzolari and others
Astrophysics of Galaxies, Cosmology and Nongalactic Astrophysics
JWST Measurements of Neutral Hydrogen Fractions and Ionized Bubble Sizes at z=7-12 Obtained with Lyα Damping Wing Absorptions in 27 Bright Continuum Galaxies
13 June 2024 by Hiroya Umeda and others
Astrophysics of Galaxies
Towards unveiling the Cosmic Reionization: the ionizing photon production efficiency (ξ_{ion}) of Low-mass Hα emitters at z \sim 2.3
6 June 2024 by Nuo Chen and others
Astrophysics of Galaxies
Statistics for Galaxy Outflows at z\sim 6-9 with Imaging and Spectroscopic Signatures Identified with JWST/NIRCam and NIRSpec Data
8 May 2024 by Yechi Zhang and others at LogoASTRON
Astrophysics of Galaxies
JWST-JADES. Possible Population III signatures at z=10.6 in the halo of GN-z11
16 April 2024 by Roberto Maiolino and others at LogoASTRON
Astrophysics of Galaxies, Cosmology and Nongalactic Astrophysics
Lyα Emission at z=7-13: Clear Lyα Equivalent Width Evolution Indicating the Late Cosmic Reionization History
29 March 2024 by Minami Nakane and others
Astrophysics of Galaxies
Multiple emission lines of Hα emitters at z \sim 2.3 from the broad and medium-band photometry in the ZFOURGE Survey
12 March 2024 by Nuo Chen and others
Astrophysics of Galaxies
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 Comparisons
11 March 2024 by Kuria Watanabe and others at LogoASTRON
Astrophysics of Galaxies
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
10 March 2024 by Shun Hatano and others
Astrophysics of Galaxies
On the observability and identification of Population III galaxies with JWST
1 March 2024 by James A. A. Trussler and others
Astrophysics of Galaxies
EMPRESS. XII. Statistics on the Dynamics and Gas Mass Fraction of Extremely-Metal Poor Galaxies
26 January 2024 by Yi Xu and others
Astrophysics of Galaxies
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 Escape
25 January 2024 by Seiji Fujimoto and others at LogoASTRON
Astrophysics of Galaxies
Census for the Rest-frame Optical and UV Morphologies of Galaxies at z=4-10: First Phase of Inside-Out Galaxy Formation
7 January 2024 by Yoshiaki Ono and others
Astrophysics of Galaxies
Pure Spectroscopic Constraints on UV Luminosity Functions and Cosmic Star Formation History From 25 Galaxies at z_\mathrm{spec}=8.61-13.20 Confirmed with JWST/NIRSpec
10 December 2023 by Yuichi Harikane and others at LogoASTRON
Astrophysics of Galaxies
JWST Identification of Extremely Low C/N Galaxies with [N/O]\gtrsim 0.5 at z\sim 6-10 Evidencing the Early CNO-Cycle Enrichment and a Connection with Globular Cluster Formation
4 December 2023 by Yuki Isobe and others at LogoASTRON
Astrophysics of Galaxies
JADES: Carbon enrichment 350 Myr after the Big Bang in a gas-rich galaxy
16 November 2023 by Francesco D'Eugenio and others at LogoASTRON
Astrophysics of Galaxies
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 Properties
29 October 2023 by Yuichi Harikane and others
Astrophysics of Galaxies
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