109 citations · 346 across the 23 of their papers we have counts for
23 papers
An alternative proof of Miyashita's theorem in a skew polynomial ring II
Satoshi Yamanaka
Y. Miyashita gave characterizations of a separable polynomial and a Hirata separable polynomial in skew polynomial rings. In the previous paper, the author and S. Ikehata gave dire…
On Weakly Separable Polynomials in Skew Polynomial Rings
Satoshi Yamanaka
The notion of weakly separable extensions was introduced by N. Hamaguchi and A. Nakajima as a generalization of separable extensions. The purpose of this article is to give a chara…
Note on Morita equivalence in ring extensions
Satoshi Yamanaka
It seems that Morita invariance is a useful criterion for judging the importance of the classes of ring extensions concerned. Y. Miyashita introduced the notion of Morita equivalen…
The first direct imaging of the silhouette of a damped Lyman system along the line-of-sight to a background galaxy
Fuga Komori, Akio K. Inoue, Ken Mawatari +7
The H~{\sc i} gas distribution in damped Lyman absorbers (DLAs) has remained elusive due to the point-source nature of background quasar emission. Observing DLAs against spatia…
JWST/NIRSpec spectroscopy of intermediate-mass quiescent galaxies at
Riku A. Sato, Akio K. Inoue, Yuichi Harikane +9
We present the analysis of three intermediate-mass quiescent galaxies (QGs) with stellar masses of at redshifts using NIRSpec low-resolutio…
Gas conditions of a star-formation selected sample in the first billion years
Tom J. L. C. Bakx, Hiddo S. B. Algera, Bram Venemans +20
We present Atacama Large Millimetre/submillimetre Array (ALMA) observations of the [O] 88 m emission of a sample of thirteen galaxies at = 6 to 7.6 selected as […
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
Yuichi Harikane, Akio K. Inoue, Richard S. Ellis +33
We present the number densities and physical properties of the bright galaxies spectroscopically confirmed at . Our sample is composed of 60 galaxies at $z_\mathrm{spec}…
SILVERRUSH. XIII. A Catalog of 20,567 Ly Emitters at Identified in the Full-depth Data of the Subaru/HSC-SSP and CHORUS Surveys
Satoshi Kikuta, Masami Ouchi, Takatoshi Shibuya +13
We present 20,567 Ly emitters (LAEs) at that are photometrically identified by the SILVERRUSH program in a large survey area up to 25 deg with deep images of fiv…
Detections of [C II] 158 m and [O III] 88 m in a Local Lyman Continuum Emitter, Mrk 54, and its Implications to High-redshift ALMA Studies
Ryota Ura, Takuya Hashimoto, Akio K. Inoue +17
We present integral field, far-infrared (FIR) spectroscopy of Mrk 54, a local Lyman Continuum Emitter (LCE), obtained with FIFI-LS on the Stratospheric Observatory for Infrared Ast…
Bridging Optical and Far-Infrared Emission-Line Diagrams of Galaxies from Local to the Epoch of Reionization: Characteristic High [O III] 88 /SFR at
Yuma Sugahara, Akio K. Inoue, Yoshinobu Fudamoto +3
We present photoionization modeling of galaxy populations at , , and to bridge optical and far-infrared (FIR) emission-line diagrams. We collect galaxies with meas…
Possible Systematic Rotation in the Mature Stellar Population of a Galaxy
Tsuyoshi Tokuoka, Akio K. Inoue, Takuya Hashimoto +13
We present new observations with the Atacama Large Millimeter/submillimeter Array for a gravitationally-lensed galaxy at , MACS1149-JD1. [O III] 88-m emission is detected…
Big Three Dragons: Molecular Gas in a Bright Lyman-Break Galaxy at
Takuya Hashimoto, Akio K. Inoue, Yuma Sugahara +10
We report ALMA Band 3 observations of CO(6-5), CO(7-6), and [CI](2-1) in B14-65666 (``Big Three Dragons''), one of the brightest Lyman-Break Galaxies at in the rest-frame ult…
CHORUS IV: Mapping the Spatially Inhomogeneous Cosmic Reionization with Subaru HSC
Takehiro Yoshioka, Nobunari Kashikawa, Akio K. Inoue +11
The spatial inhomogeneity is one of the important features for understanding the reionization process; however, it has not yet been fully quantified. To map this inhomogeneous dist…
A Search for H-Dropout Lyman Break Galaxies at z~12-16
Yuichi Harikane, Akio K. Inoue, Ken Mawatari +11
We present two bright galaxy candidates at z~12-13 identified in our H-dropout Lyman break selection with 2.3 deg2 near-infrared deep imaging data. These galaxy candidates, selecte…
A Morphological Study on Galaxies Hosting Optical Variability-Selected AGNs in the COSMOS Field
Yuxing Zhong, Akio K. Inoue, Satoshi Yamanaka +1
The morphological study is crucial to investigate the connections between active galactic nuclei (AGN) activities and the evolution of galaxies. Substantial studies have found that…
SILVERRUSH XI: Constraints on the Ly luminosity function and cosmic reionization at with Subaru/Hyper Suprime-Cam
Hinako Goto, Kazuhiro Shimasaku, Satoshi Yamanaka +6
The Ly luminosity function (LF) of Ly emitters (LAEs) has been used to constrain the neutral hydrogen fraction in the intergalactic medium (IGM) and thus the timeline of cosm…
The SSA22 HI Tomography Survey (SSA22-HIT). I. Data Set and Compiled Redshift Catalog
Ken Mawatari, Akio K. Inoue, Toru Yamada +16
We conducted a deep spectroscopic survey, named SSA22-HIT, in the SSA22 field with the DEep Imaging MultiObject Spectrograph (DEIMOS) on the Keck telescope, designed to tomographic…
SILVERRUSH X: Machine Learning-Aided Selection of LAEs at , , , , , and from the HSC SSP and CHORUS Survey Data
Yoshiaki Ono, Ryohei Itoh, Takatoshi Shibuya +25
We present a new catalog of Ly emitter (LAE) candidates at , , , , , and that are photometrically selected by the SILVERRUSH program wi…
Big Three Dragons: A [N II] 122 m Constraint and New Dust-continuum Detection of A Bright Lyman Break Galaxy with ALMA
Yuma Sugahara, Akio K. Inoue, Takuya Hashimoto +6
We present new Atacama Large Millimeter/submillimeter Array Band 7 observational results of a Lyman break galaxy at , B14-65666 ("Big Three Dragons"), which is an object…
CHORUS. I. Cosmic HydrOgen Reionization Unveiled with Subaru: Overview
Akio K. Inoue, Satoshi Yamanaka, Masami Ouchi +28
To determine the dominant sources for cosmic reionization, the evolution history of the global ionizing fraction, and the topology of the ionized regions, we have conducted a deep…
Testing an indirect method for identifying galaxies with high levels of Lyman continuum leakage
Satoshi Yamanaka, Akio K. Inoue, Toru Yamada +6
Using a sample of galaxies at with detected Lyman Continuum (LyC) leakage in the SSA22 field, we attempt to verify a proposed indirect method for identifying cases wit…
Balmer Break Galaxy Candidates at : a Potential View on the Star-Formation Activity at
Ken Mawatari, Akio K. Inoue, Takuya Hashimoto +15
We search for galaxies with a strong Balmer break (Balmer Break Galaxies; BBGs) at over a 0.41 deg effective area in the COSMOS field. Based on rich imaging data, in…
The UV spectral slope beta and stellar population of most active star-forming galaxies at z~4
Satoshi Yamanaka, Toru Yamada
We investigate the stellar population of star-forming galaxies at by focusing on their slope of rest-frame ultraviolet (UV) continuum, where . We in…