Articles by Hiroya Umeda

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Hiroya Umeda

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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

National Astronomical Observatory of Japan

Astrophysics of Galaxies

SILVERRUSH. XIV. Lya Luminosity Functions and Angular Correlation Functions from ~20,000 Lya Emitters at z~2.2-7.3 from upto 24 {\rm deg}^2 HSC-SSP and CHORUS Surveys: Linking the Post-Reionization Epoch to the Heart of Reionization

23 November 2024 by Hiroya Umeda and others

Astrophysics of Galaxies

Increasing Both Batch Size and Learning Rate Accelerates Stochastic Gradient Descent

16 October 2024 by Hikaru Umeda and Hideaki Iiduka at

Meiji University

Machine Learning, Optimization and Control

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

Evidence for Type Ib/c origin of the supernova remnant G292.0+1.8

26 September 2024 by Takuto Narita and others

High Energy Astrophysical Phenomena

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

The formation of black holes from rapidly accreting supermassive stars is not trivial: Simulations of thermonuclear pulsations and explosions

15 August 2024 by Chris Nagele and Hideyuki Umeda

High Energy Astrophysical Phenomena, Solar and Stellar Astrophysics

STELLA lightcurves of energetic pair instability supernovae in the context of SN2018ibb

16 July 2024 by Chris Nagele and others at

ASTRON

High Energy Astrophysical Phenomena, Solar and Stellar 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

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

National Astronomical Observatory of Japan

Astrophysics of Galaxies

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

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

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

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