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...

The puzzling dark-matter of the Andromeda galaxy

Image

Summary The research group consisting of postdoctoral fellow Takanobu Kirihara of the Graduate School of Pure and Applied Sciences, CCS postdoctoral fellow Yohei Miki, and led by CCS associate professor Masao Mori, has probed the dark matter*1 surrounding the Andromeda Galaxy*2 and found that the distribution of the dark matter...

Black-holes growing through mergers: Unraveling the mysteries of supermassive black holes through high-performance simulations

Image

Abstract Supermassive black holes (SMBH) have been observed in a large number of galaxies, but their origin and formation is still unkown. In the standard theory of galaxy formation, galaxies grow by successive mergers of smaller galaxies. If every galaxy had a black hole, then one could imagine that, after...

Global Radiation-Magnetohydrodynamic Simulations of Black Hole Accretion Flow and Outflow: Unified Model of Three States

Image

Understanding gas accretion to the central supermassive black hole of galaxies has developed greatly and the standard disk model which appeared in the 1970s, has been extended by a slim disk model and a quasi-one-dimensional advection dominated accretion flow (ADAF) sometimes know as a radiatively inefficent accretion flow (RIAF) model....

Non-Equilibrium Ionization State and Two-Temperature Structure in the Linked Region of Abell 399 and Abell 401

Image

Figure: Side-on view of galaxies colliding from the left and right. White solid square is a region that has already been observed by the Japanese X-ray satellite Suzaku (Fujita et al. 2008 PASJ, 60, S343), while the white dotted line shows the newly predicted region of the shock-front. The panels...