312 citations · 1.7k across the 44 of their papers we have counts for
14 papers · 1 filter
Modelling Population III stars for semi-numerical simulations
Toshiyuki Tanaka, Kenji Hasegawa
Theoretically modelling the 21-cm signals caused by Population III stars (Pop III stars) is the key to extracting fruitful information on Pop III stars from current and forthcoming…
Discrimination of heavy elements originating from Pop III stars in z = 3 intergalactic medium
Takanobu Kirihara, Kenji Hasegawa, Masayuki Umemura +2
We investigate the distribution of metals in the cosmological volume at , in particular, provided by massive population III (Pop III) stars using a cosmological -body si…
Stellar mass dependence of the 21-cm signal around the first star and its impact on the global signal
Toshiyuki Tanaka, Kenji Hasegawa, Hidenobu Yajima +2
The 21-cm signal in the vicinity of the first stars is expected to reflect properties of the first stars. In this study we pay special attention to tracing the time evolution of th…
SILVERRUSH. VII. Subaru/HSC Identifications of 42 Protocluster Candidates at z~6-7 with the Spectroscopic Redshifts up to z=6.574: Implications for Cosmic Reionization
Ryo Higuchi, Masami Ouchi, Yoshiaki Ono +17
We report fourteen and twenty-eight protocluster candidates at z=5.7 and 6.6 over 14 and 19 deg^2 areas, respectively, selected from 2,230 (259) Lya emitters (LAEs) photometrically…
SILVERRUSH. VI. A simulation of Ly emitters in the reionization epoch and a comparison with Subaru Hyper Suprime-Cam survey early data
Akio K. Inoue, Kenji Hasegawa, Tomoaki Ishiyama +12
The survey of Lyman emitters (LAEs) with Subaru Hyper Suprime-Cam, called SILVERRUSH (Ouchi et al.), is producing massive data of LAEs at . Here we present LAE simul…
Diversity of the Lyman continuum escape fractions of high- galaxies and its origins
Takumi Sumida, Daichi Kashino, Kenji Hasegawa
The Lyman continuum (LyC) escape fraction is a key quantity to determine the contribution of galaxies to cosmic reionization. It has been known that the escape fractions estimated…
Systematic Identification of LAEs for Visible Exploration and Reionization Research Using Subaru HSC (SILVERRUSH). I. Program Strategy and Clustering Properties of ~2,000 Lya Emitters at z=6-7 over the 0.3-0.5 Gpc Survey Area
Masami Ouchi, Yuichi Harikane, Takatoshi Shibuya +17
We present the SILVERRUSH program strategy and clustering properties investigated with Ly emitters at and found in the early data of the Hyper Suprime…
Evolutionary Description of Giant Molecular Cloud Mass Functions on Galactic Disks
Masato I. N. Kobayashi, Shu-ichiro Inutsuka, Hiroshi Kobayashi +1
Recent radio observations show that the giant molecular cloud (GMC) mass functions noticeably vary across galactic disks. High-resolution magnetohydrodynamics simulations show that…
Modelling of Lyman-alpha Emitting Galaxies and Ionized Bubbles at the Era of Reionization
Hidenobu Yajima, Kazuyuki Sugimura, Kenji Hasegawa
Understanding Ly emitting galaxies (LAEs) can be a key to reveal cosmic reionization and galaxy formation in the early Universe. Based on halo merger trees and Ly radiation t…
Formation of globular clusters induced by external ultraviolet radiation II: Three-dimensional radiation hydrodynamics simulations
Makito Abe, Masayuki Umemura, Kenji Hasegawa
We explore the possibility of the formation of globular clusters under ultraviolet (UV) background radiation. One-dimensional spherical symmetric radiation hydrodynamics (RHD) simu…
Where are the Low-Mass Population III Stars ?
Tomoaki Ishiyama, Kae Sudo, Shingo Yokoi +3
We study the number and the distribution of low mass Pop III stars in the Milky Way. In our numerical model, hierarchical formation of dark matter minihalos and Milky Way sized hal…
The Mass Spectrum of the First Stars
Hajime Susa, Kenji Hasegawa, Nozomu Tominaga
We perform cosmological hydrodynamics simulations with non-equilibrium primordial chemistry to obtain 59 minihalos that host first stars. The obtained minihalos are used as initial…
On the evolution of gas clouds exposed to AGN radiation. I. Three-dimensional radiation hydrodynamic simulations
Daisuke Namekata, Masayuki Umemura, Kenji Hasegawa
We perform three-dimensional radiation hydrodynamic simulations of uniform dusty gas clouds irradiated by an active galactic nucleus (AGN) to investigate the dependence of evolutio…
Formation and Radiative Feedback of First Objects and First Galaxies
Masayuki Umemura, Hajime Susa, Kenji Hasegawa +2
First, the formation of first objects driven by dark matter is revisited by high-resolution hydrodynamic simulations. It is revealed that dark matter haloes of ~10^4M_sun can produ…