About Center for Computational Astrophysics
Numerical simulation in astronomy is regarded as the third methodology of astronomy alongside observational and theoretical astronomy. We need computer simulation because it is practically impossible for us to perform laboratory experiments of astronomical phenomena due to their huge time and spatial scales. We create universes in computers (often very large ones, referred to as supercomputers) reproduce astronomical phenomena there, and observe their behavior. In other words, computers are experimental tools to create virtual universes, and at the same time telescopes to observe them. In these virtual universes, we can watch the very early stage of the cosmos and its evolution, we can reproduce the formation of galaxies, and we can witness the origin, evolution, and final fate of planetary systems including our own. Our project, CfCA, possesses various types of high-performance computers such as a massive parallel computer Cray XC50 “ATERUI Ⅱ,” a bunch of special-purpose computers for gravitational many-body problems “GRAPE” and other facilities, all of which operate twenty-four hours a day, throughout the year. Astronomers all over the world use these resources. In addition, CfCA works on research and development for new software algorithms for the next-generation of simulation astronomy that will enable us to perform the largest numerical experiments ever attempted. By numerical simulations with supercomputers, we will, probably in the very near future, solve the longstanding questions such as the formation of galaxies, the origin of the Solar System, and the real picture of black holes.
A magnetohydrodynamics simulation of interactions between an astrophysical jet (blue) and interstellar clouds (orange). Black lines show magnetic field lines. The jet accelerates the dense interstellar clouds during the propagation of the jet. This simulation revealed that the magnetic field enhances the acceleration of the dense clouds by the magnetic tension force.
Cray XC50 “ATERUI Ⅱ”
ATERUI Ⅱ is a supercomputer dedicated to astronomy. Full-scale operation started in June 2018.
GRAPE is a computer cluster dedicated to gravitational many-body problems to promote research about astronomy and related fields through large-scale theoretical simulations.
Cray XC30 “ATERUI”
ATERUI was a supercomputer dedicated to astronomy erected at Mizusawa VLBI Observatory. It ended its operation in March, 2018.