An online paper published on September 25, 2018 describes first results from the research of an international team of scientists including the Department of Astrophysical Sciences’ Michael Strauss, David Spergel, Elinor Medezinski, Cristóbal Sifónand James Bosch. They are studying the distribution of dark matter in the universe using extremely deep images from the Hyper Suprime-Cam (HSC) wide-field camera mounted on the National Astronomical Observatory of Japan’s (NAOJ) Subaru Telescope. These maps are analyzed to determine the level of cosmic shear produced by gravitational lensing.
The initial results of the weak lensing sky survey will help the researchers study the gravitational effects of dark matter on the growth of cosmic structures in the universe, including galaxies and clusters of galaxies. The survey shows a “lumpy” universe created by the gravitational effects of dark matter massing together over billions of years. Cosmological results from the HSC first-year data represents roughly 10% of the area that will be surveyed by the study’s completion date, estimated to be in 2019. The full story can be read here.