About Us

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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】Hibernating black holes - Destruction of the central black hole gas reservoir through galaxy collisions

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Supermassive black holes exist in the universe that are more than 100,000 times the mass of the Sun, and, although only a small part of them are luminous due to the energy of accreting material, in most galaxies, the central massive black hole is dark and quiet. The mechanism that...

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Formation of Astrophysical Objects 2021

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. In view of the current COVID-19 situation, we will hold the event fully online this year. We will let you know how to connect to the workshop once you have registered. You are welcome to upload your slides in advance. This will be helpful for everyone when following...

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[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...

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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...

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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...

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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...

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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...

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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...

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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....

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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...

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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...

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A theoretical framework for cosmological analysis of 21-cm line observations

Observations confirm that the universe is accelerating and expanding. Dark energy and modified gravity theories have been...

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The Diversity of IGM-galaxy connection among galaxies at redshift z = 2-3...

The link between the intergalactic medium (IGM) and galaxies is key to understand the evolution of baryonic...

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Galaxy-IGM workshop 2021

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

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Multiple AGN Science Workshop

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

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Formation of Astrophysical Objects 2020

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

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Galaxy-IGM workshop 2020

From August 3 to 7 2020, we will hold the "Galaxy-IGM Workshop 2020". In view of the...

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Discrimination of heavy elements originating from Pop III stars in z = 3 intergalactic medium

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Spiral-arm instability - III. Fragmentation of primordial protostellar discs

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The thermal-radiative wind in low-mass X-ray binary H1743-322: radiation hydrodynamic simulations

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First Identification of 10 kpc [C II] 158 \ensuremathμm Halos around Star-forming Galaxies at z = 5─7

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Searching for signs of jet-driven negative feedback in the nearby radio galaxy UGC 05771

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Abundant Refractory Sulfur in Protoplanetary Disks