Using the powerful Japanese Subaru telescope, the Hyper Suprime-Cam (HSC) survey collaboration team has made and analyzed the deepest wide field map of the three-dimensional distribution of matter in the Universe. Led by Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU) Project Assistant Professor Chiaki Hikage, a team of scientists primarily from Japan, Taiwan and Princeton University has used the gravitational distortion of images of about 10 million galaxies to make a precise measurement of the lumpiness of matter in the Universe. By combining this measurement with the European Space Agency Planck satellite’s observations of the cosmic microwave background, and other cosmological experiments, the team has been able to further constrain the properties of the “dark energy” that dominates the energy density of the Universe. (September 26, 2018 press release)
In this research, "PC Cluster" and Supercomputer "ATERUI" operated by CfCA were used for estimations of various model parameters including clumpiness of the matter distribution S8 from comparisons observation results and cosmological simulations.
"PC Cluster" (upper panel) is the system for small-scale and non-parallel simulations. This system consists of 224 nodes as of October 2018.
"ATERUI" (lower panel) is NAOJ's 4th generation supercomputer dedicated for astronomical simulations. The theoretical peak performance is 1.058 Pflops. This system had been operated until March 2018.
Title: Cosmology from cosmic shear power spectra with Subaru Hyper Suprime-Cam first-year data
Authors: Chiaki Hikage, Masamune Oguri, Takashi Hamana, Surhud More, Rachel Mandelbaum, Masahiro Takada, et al.
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Kavli IPMU press release "Cosmological constraints from the first-year Subaru Hyper Suprime-Cam survey"
Subaru Telescope press release "Cosmological Constraints from the First-Year Hyper Suprime-Cam"
NAOJ press release "Cosmological Constraints from the First-Year Hyper Suprime-Cam"