和 英 
About Us
Our group strives to uncover the basic physics of star formation, planetary systems, active galactic nuclei, the birth of stars and galaxies of the early universe, the characteristics of the light they emit, formation and evolution of galaxies and black holes. We tackle many of the problems of modern astrophysics by solving equations of relativistic radiation hydrodynamics, radiation transport, and gravitational dynamics, which faithfully capture the interaction of light with matter and the complex gravitational interactions, so crucial in the study of the formation and evolution of stars, galaxies, and black holes. To find solutions to the complicated system of equations that describe multi-component celestial bodies and turbulent flow, we conduct large-scale numerical simulations, using, amongst others, tailor-made supercomputers at the Center for Computational Sciences.
Featured Articles
Frequency of the dark matter subhalo collisions and bifurcation sequence arising formation of dwarf galaxies
Abstract The cold dark matter model predicts galaxies have 100 times more dark matter mass than stars. Nevertheless, recent observations report the existence of dark-matter-deficient galaxies with less dark matter than expected. To solve this problem, we investigate the physical processes of galaxy formation in head-on collisions between gas-containing dark...
Recent Posts
磁気トルネード現象に注目した，太陽コロナ加熱のためのエネルギー発生・輸送・散逸の数値的研究
Hidetaka Kuniyoshi
The outermost atmosphere of the Sun (the corona) reaches temperatures hundreds of times hotter than its surface (the photosphere), exceeding 1 million degrees. This issue of solar corona heating has been an unresolved problem since the 1930s and is a main target of the SOLAR-C mission. Furthermore, the solar corona is a source of extreme ultraviolet and X-ray radiation, which significantly influences the evolution of planetary atmospheres, making it also crucial for studies of the habitability of exoplanets. It is believed that the energy for corona heating is transported by Alfvén waves generated in the photosphere, and recent attention has...
[Press release] The Cosmic Neutrino Background: World's First Six-dimensional Simulations
In this research, we solved the Vlasov-Poisson equations directly by running our new high-precision numerical scheme for...
Theoretical and Observational Astrophysics Joint New Members BBQ
On the 3rd of May 2018, the Theoretical Astrophysics and the Observational Astrophysics groups organized a barbeque...
38th National High School Cultural Festival in Ibaraki "Ibaraki Sobun 2014"
On July 28, 2014, Yu Komatsu was interviewed by students of the newspaper division of the 38th...
State Transitions and Time Variations of Black Hole Accretion Flows
Black hole candidates display transitions between hard and soft X-ray states. During the transition, quasi-periodic oscillations and...
A fierce new challenge: unveiling the connection between the first galaxies and...
The Epoch of Reionization (EoR) shaped the properties of the baryonic content of the Universe. Using hydrodynamical...
Computing the Universe: from Intergalactic to Interstellar Medium
This talk will highlight some progress made based on our efforts of computing the universe, in order...
Probing dust aggregate structure in protoplanetary disks by millimeter-wave polarization
Dust coagulation in protoplanetary disks is the first step of planetesimal formation. However, a pathway from dust...
ALMA and JWST exploration of high-redshift galaxies (and stars)
Extragalactic astronomy is currently in an exciting period. Observing high-redshift galaxies allows us to directly see galaxies...
Cloud-scale molecular gas properties of nearby spiral and starburst galaxies with ALMA...
(Ultra)luminous infrared galaxies (= (U)LIRGs) at z=0 form stars 10-100 times more efficiently than z=0 main sequence...
X線偏光観測による活動銀河核の構造
Active Galactic Nucleus (AGN) is a phenomenon in which the accretion of mass onto a supermassive black...
ダークマターは何者か？：暗黒物質の解明に向けた近傍宇宙論研究の現状と将来展望
Most of the matter in the universe is dominated by dark matter. However, its nature remains a...
The grand meeting on black holes
~from stellar mass to super massive...
Almost 100 years after the prediction of general relativity, the existence of black holes has finally been...
Formation of Astrophysical Objects 2023
This workshop aims to provide an opportunity to exchange views and share information about the current status...
Black-hole jets, accretion discs, and disc-winds workshop 2023
Despite the fact that the existence of black holes is now firmly established, the structure and physical...
Formation of Astrophysical Objects 2022
This workshop aims to provide an opportunity to exchange views and share information about the current status...
Recent Work
FOREVER22: Gas and metal outflow from massive galaxies in protocluster regions
Generation of high circular polarization of interstellar Lyman α radiation triggering biological homochirality
The formation of globular clusters with top-heavy initial mass functions
FOREVER22: The first bright galaxies with population III stars at redshifts z ≈ 10-20 and comparisons with JWST data
Cosmological-scale Lyα Forest Absorption around Galaxies and AGNs Probed with the HETDEX and SDSS Spectroscopic Data
Morphologies of Galaxies at z ≳ 9 Uncovered by JWST/NIRCam Imaging: Cosmic Size Evolution and an Identification of an Extremely Compact Bright Galaxy at z 12