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.
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...
Extragalactic astronomy is currently in an exciting period. Observing high-redshift galaxies allows us to directly see galaxies in the distant past, dating back to when the Universe was only nearly a few hundred million years old. This remarkable feature has led astronomers to dedicate significant efforts toward finding and studying galaxies at high redshift to unravel the mysteries of galaxy formation and evolution in the early Universe. Particularly, over the past ten years of the Atacama Large Millimeter/submillimeter Array (ALMA) observations, combined with the recent breakthroughs from the James Webb Space Telescope (JWST), we have begun to access the extraordinarily...
In this research, we solved the Vlasov-Poisson equations directly by running our new high-precision numerical scheme for...
On the 3rd of May 2018, the Theoretical Astrophysics and the Observational Astrophysics groups organized a barbeque...
On July 28, 2014, Yu Komatsu was interviewed by students of the newspaper division of the 38th...
Black hole candidates display transitions between hard and soft X-ray states. During the transition, quasi-periodic oscillations and...
The Epoch of Reionization (EoR) shaped the properties of the baryonic content of the Universe. Using hydrodynamical...
This talk will highlight some progress made based on our efforts of computing the universe, in order...
Dust coagulation in protoplanetary disks is the first step of planetesimal formation. However, a pathway from dust...
(Ultra)luminous infrared galaxies (= (U)LIRGs) at z=0 form stars 10-100 times more efficiently than z=0 main sequence...
Active Galactic Nucleus (AGN) is a phenomenon in which the accretion of mass onto a supermassive black...
Most of the matter in the universe is dominated by dark matter. However, its nature remains a...
In discussing the formation and evolution of galaxies, it is essential to know how the material circulation...
Almost 100 years after the prediction of general relativity, the existence of black holes has finally been...
This workshop aims to provide an opportunity to exchange views and share information about the current status...
Despite the fact that the existence of black holes is now firmly established, the structure and physical...
This workshop aims to provide an opportunity to exchange views and share information about the current status...