67 citations · 358 across the 18 of their papers we have counts for
18 papers
JWST Identification of Extremely Low C/N Galaxies with [N/O] at Evidencing the Early CNO-Cycle Enrichment and a Connection with Globular Cluster Formation
Yuki Isobe, Masami Ouchi, Nozomu Tominaga +9
We present chemical abundance ratios of 70 star-forming galaxies at -10 observed by the JWST/NIRSpec ERO, GLASS, and CEERS programs. Among the 70 galaxies, we have pinpoint…
Generation of high circular polarization of interstellar Lyman radiation triggering biological homochirality
Hajime Fukushima, Hidenobu Yajima, Masayuki Umemura
The homochirality of biological molecules on the Earth is a long-standing mystery regarding the origin of life. Circularly polarized ultraviolet (UV) light could induce the enantio…
Observational signatures of forming young massive clusters: continuum emission from dense HII regions
Mutsuko Inoguchi, Takashi Hosokawa, Hajime Fukushima +3
Young massive clusters (YMCs) are the most massive star clusters forming in nearby galaxies and are thought to be a young analogue to the globular clusters. Understanding the forma…
An Unbiased CO Survey Toward the Northern Region of the Small Magellanic Cloud with the Atacama Compact Array. II. CO Cloud Catalog
Takahiro Ohno, Kazuki Tokuda, Ayu Konishi +16
The nature of molecular clouds and their statistical behavior in subsolar metallicity environments are not fully explored yet. We analyzed data from an unbiased CO( = 2-1) surve…
EMPRESS. XII. Statistics on the Dynamics and Gas Mass Fraction of Extremely-Metal Poor Galaxies
Yi Xu, Masami Ouchi, Yuki Isobe +49
We present demography of the dynamics and gas-mass fraction of 33 extremely metal-poor galaxies (EMPGs) with metallicities of and low stellar masses of $10^4-…
The formation of globular clusters with top-heavy initial mass functions
Hajime Fukushima, Hidenobu Yajima
We study the formation of globular clusters in massive compact clouds with the low-metallicity of by performing three-dimensional radiative-hydrodynamics simu…
3D Radiation-Hydrodynamic Simulations Resolving Interior of Rapidly Accreting Primordial Protostar
Kazutaka Kimura, Takashi Hosokawa, Kazuyuki Sugimura +1
Direct collapse of supermassive stars is a possible pathway to form supermassive black hole seeds at high redshifts. Whereas previous three-dimensional (3D) simulations demonstrate…
EMPRESS. XI. SDSS and JWST Search for Local and z~4-5 Extremely Metal-Poor Galaxies (EMPGs): Clustering and Chemical Properties of Local EMPGs
Moka Nishigaki, Masami Ouchi, Kimihiko Nakajima +16
We search for local extremely metal-poor galaxies (EMPGs), selecting photometric candidates by broadband color excess and machine-learning techniques with the SDSS photometric data…
FOREVER22: the first bright galaxies with population III stars at redshifts and comparisons with JWST data
Hidenobu Yajima, Makito Abe, Hajime Fukushima +5
We study the formation of the first galaxies in overdense regions modelled by the FORmation and EVolution of galaxies in Extremely overdense Regions motivated by SSA22 (FOREVER22)…
Far and extreme UV radiation feedback in molecular clouds and its influence on the mass and size of star clusters
Hajime Fukushima, Hidenobu Yajima
We study the formation of star clusters in molecular clouds by performing three-dimensional radiation hydrodynamics simulations with far ultraviolet (FUV; $6 ~{\rm eV} \leqq h ν\le…
An Unbiased CO Survey Toward the Northern Region of the Small Magellanic Cloud with the Atacama Compact Array. I. Overview: CO Cloud Distributions
Kazuki Tokuda, Hiroshi Kondo, Takahiro Ohno +15
We have analyzed the data from a large-scale CO survey toward the northern region of the Small Magellanic Cloud (SMC) obtained with the Atacama Compact Array (ACA) stand-alone mode…
Radiation hydrodynamics simulations of massive star cluster formation in giant molecular clouds
Hajime Fukushima, Hidenobu Yajima
By performing three-dimensional radiation hydrodynamics simulations, we study the formation of young massive star clusters (YMCs, ) in clouds with the surface…
FOREVER22: galaxy formation in protocluster regions
Hidenobu Yajima, Makito Abe, Sadegh Khochfar +14
We present results from a new cosmological hydrodynamics simulation campaign of protocluster (PC) regions, FOREVER22: FORmation and EVolution of galaxies in Extremely-overdense Reg…
High circular polarization of near infrared light induced by micron-size dust grains
Hajime Fukushima, Hidenobu Yajima, Masayuki Umemura
We explore the induction of circular polarization (CP) of near-infrared light in star-forming regions using three-dimensional radiative transfer calculations. The simulations trace…
Star cluster formation and cloud dispersal by radiative feedback: dependence on metallicity and compactness
Hajime Fukushima, Hidenobu Yajima, Kazuyuki Sugimura +3
We study star cluster formation in various environments with different metallicities and column densities by performing a suite of three-dimensional radiation hydrodynamics simulat…
Formation of massive stars under protostellar radiation feedback: Very metal-poor stars
Hajime Fukushima, Takashi Hosokawa, Gen Chiaki +3
We study the formation of very metal-poor stars under protostellar radiative feedback effect. We use cosmological simulations to identify low-mass dark matter halos and star-formin…
Condition for dust evacuation from the first galaxies
Hajime Fukushima, Hidenobu Yajima, Kazuyuki Omukai
Dust enables low-mass stars to form from low-metallicity gas by inducing fragmentation of clouds via the cooling by its thermal emission. Dust may, however, be evacuated from star-…
Upper stellar mass limit by radiative feedback at low-metallicities: metallicity and accretion rate dependence
Hajime Fukushima, Kazuyuki Omukai, Takashi Hosokawa
We investigate the upper stellar mass limit set by radiative feedback by the forming star with various accretion rates and metallicities. To this end, we numerically solve the stru…