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

3-dimensional radiative transfer simulations including diffuse photons on GPUs (Part 1)

Image

Abstract Accurately solving the equations of radiative transfer for the radiation from stars and the interstellar medium is vital to underestanding the physics governing the interstellar medium, galaxy formation and evolution, and large-scale structure. Light from stars is absorbed and attenuated by neutral gas, but ultra-violet photons and those beyond...

Image

Formation of Astrophysical Objects 2019

This workshop aims to provide an opportunity to exchange views and share information about the current status of observations and theoretical research on a wide range of aspects concerning the formation of astronomical objects. Moreover, it also serves as interim report by students in our research group who are working on dissertations.

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...

image

Three JSPS 2014 Research Fellowships for Young Scientists

From left to right: Takanobu Kirihara, Yu Komatsu, Hiroyuki Suzuki. Congratulations to the three doctoral students in...

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

A series of "most distant" results

Recently, using Subaru and ALMA, we were able to make a series of press releases entitled “most...

image

New insights into the formation of massive galaxies and galaxy clusters in...

During the last decades, our understanding on both galaxy and structure formation in the nearby Universe has...

image

Gravitational instability and fragmentation of spiral arms

Spiral arms in a disc are structures found in various astronomical objects. Sometimes spiral arms fragment into...

image

Massive star formation through molecular cloud collisions and triggered star-formation through feedback...

In recent years, molecular cloud collisions have attracted attention as the formation process of massive stars and...

Read more articles
image

Galaxy-IGM workshop 2019

The Galaxy-IGM workshop 2019 will be held at the Kitami Institute of Technology from the 5 -...

image

Sixth "SMBH Research Promotion and Liason" Workshop

In 2013, The Supermassive Black Hole Research Consortium (SMBH-REC) was created with the aim of promoting collaboration...

image

Formation of Astrophysical Objects

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

Read more articles
Image
More Info

Formation of the Andromeda giant stream: asymmetric structure and disc progenitor

Image
More Info

Diffuse Ly$\alpha$ haloes around galaxies at z = 2.2-6.6: implications for galaxy formation and cosmic reionization

Image
More Info

Relics of Galaxy Merging: Observational Predictions for a Wandering Massive Black Hole and Accompanying Star Cluster in the Halo of M31

Image
More Info

What is the Physical Origin of Strong Ly$\alpha$ Emission? II. Gas Kinematics and Distribution of Ly$\alpha$ Emitters

Image
More Info

Hierarchical Formation of Dark Matter Halos and the Free Streaming Scale

Image
More Info

Merger criteria of multiple massive black holes and the impact on the host galaxy