About Us

Image

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, taylor-made supercomputers at the Center for Computational Sciences.

Featured Articles

[Press release] A cosmological neutrino simulation using Fugaku chosen as a 2021 Gordon Bell Prize finalist

Image

In this research, a completely new method of Vlasov simulation was developed and adopted in a large-scale simulation of the motion of neutrinos in cosmological structure formation. The simulation was run on the entire system of supercomputer "Fugaku". Vlasov simulations can deliver noise-free numerical results compared to conventional N-body simulations,...

Recent Posts

Image

FOREVER22: galaxy formation in protocluster regions

We present results from a new cosmological hydrodynamics simulation campaign of protocluster (PC) regions, FOREVER22: FORmation and EVolution of galaxies in Extremely overdense Regions motivated by SSA22. The simulations cover a wide range of cosmological scales using three different zoom set-ups in a parent volume of (714.2 cMpc)3: PCR (Proto-Cluster Region; V = (28.6 cMpc)3, SPH particle mass, mSPH = 4.1 × 106 M⊙, and final redshift, zend = 2.0), BCG (Brightest proto-Cluster Galaxy; V ~(10 cMpc)3, mSPH = 5.0 × 105 M⊙ and zend = 4.0), and First (V ~(3 cMpc)3, mSPH = 7.9 × 103 M⊙ and zend =...

image

[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...

image

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...

image

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...

Read more articles
image

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...

image

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...

image

Radiation hydrodynamical simulations of first-star binaries including radiative feedback

The formation of the first stars after the big bang is one of the most important outstanding...

image

Uncovering the formation of extremely distant galaxies with ALMA

電波干渉系 ALMA の登場によって、宇宙再電離時代 (宇宙年齢がおそよ2-10億年) にある銀河の研究は新時代を拓いた。サブミリ波帯に赤方偏移した遠赤外の微細構造輝線 ([OIII] 88μm, [CII] 158μm など) を ALMA で観測することで、再電離時代の星形成銀河を分光同定することが可能になったのである (e.g., Inoue et al....

Read more articles
image

Molecular cloud collisions and machine learning

Massive stars are very important for the physical and chemical evolution of the interstellar medium and the...

image

On the Tidal Formation of Dark Matter Deficient Galaxies

Recently, observations reported that the ultra diffuse galaxy NGC1052-DF2 (DF2), believed to be a member of the...

image

Structure of the magnetic field driving active galactic nuclear jets probed by...

With the success of the Event Horizon Telescope in directly imaging a supermassive black hole, the study...

image

Identifying galactic structures in a galaxy more than 12 billion years ago...

Spiral galaxies observed today (redshift z=0) have distinct internal structures: supper massive black hole (SMBH), dense stellar...

Read more articles
image

Formation of Astrophysical Objects 2021

This workshop aims to provide an opportunity to exchange views and share information about the current status...

image

Galaxy-IGM workshop 2021

The Galaxy-IGM Workshop will be held again this year. For the past 10 years, the Galaxy-IGM Workshop...

image

Multiple AGN Science Workshop

A one-day workshop will be held to summarize and share the current state of understanding of multiple...

image

Formation of Astrophysical Objects 2020

This workshop aims to provide an opportunity to exchange views and share information about the current status...

Read more articles

Recent Work

Image
More Info

The extent of ionization in simulations of radio-loud AGNs impacting kpc gas discs

Image
More Info

Far and extreme UV radiation feedback in molecular clouds and its influence on the mass and size of star clusters

Image
More Info

An Unbiased CO Survey toward the Northern Region of the Small Magellanic Cloud with the Atacama Compact Array. I. Overview: CO Cloud Distributions

Image
More Info

Tracing the Ionization Structure of the Shocked Filaments of NGC 6240

Image
More Info

Impact of relativistic jets on the star formation rate: a turbulence-regulated framework

Image
More Info

Tracing the Milky Way's Vestigial Nuclear Jet