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

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

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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...

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Molecular abundances in nearby galaxies (NGC 1068, NGC 253, and IC 342)

Shuro Takano

The results from Nobeyama 45 m radio telescope observations of nearby galaxies NGC 1068, NGC 253, and IC 342 on the composition of the molecular gas will presented. NGC 1068 contains an active galactic nucleus (AGN), and the 45 m observations provide good spatial resolution to investigate the composition of the molecular gas in the vicinity of AGN. Follow-up ALMA observations complement the informatin of the spatial distributiion of molecular species. Some preliminary results from our ongoing observational campaigns will also be presented.

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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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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...

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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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Growth by Super-Eddington Accretion of Seed Black Holes in Primordial Galaxies

Recent observations have revealed that giant black holes with masses of several hundred million times larger than...

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The current status of galaxy formation at redshift 3

In the standard paradigm of coslmological large scale structure formation in Λ cold dark matter universe, dark...

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Formation of multiple Pop III stars under radiation feedback

Population III (Pop III) stars, forming as the first generation objects in the history of the Universe,...

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A series of "most distant" results

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

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Formation of Astrophysical Objects 2019

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

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Galaxy-IGM workshop 2019

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

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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...

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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