宇宙科学談話会

ISAS Space Science Colloquium & Space Science Seminar

ENGLISH

Development of Hyper Suprime-Cam and a search for clusters of galaxies via weak lensing (Hyper Suprime-Cam の開発と弱重力レンズ効果を利用した銀河団探査)

宮崎 聡
国立天文台

Hyper Suprime-Cam (HSC) is an 870 Megapixel prime focus optical imaging camera for the 8.2 m Subaru telescope. The wide field corrector delivers sharp images of 0.2 arcsec FWHM in the HSC-i band over the entire 1.5 degree diameter field of view. The collimation of the camera with respect to the optical axis of the primary mirror is done with hexapod actuators whose mechanical accuracy is few microns.
Analysis of the remaining wavefront error in off-focus stellar images reveals that the collimation of the optical components meets design specifications. While we observe the effect of flexure of the mechanical components, the impact on image qualities is limited. As a result, the camera realizes seeing-limited imaging on Mauna Kea most of the time; the median image size at the field center measured on several years of a coordinated legacy survey observation is 0.56 arc-sec FWHM in the i-band. In this talk, we will present the development of the camera and some initial results on the dark matter mapping via weak gravitational lensing.

Place: 2F Conf. room / 研究管理棟2階会議場(1236号室)