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Hyper Suprime-Cam: System design and verification of image quality

2017; Oxford University Press; Volume: 70; Issue: SP1 Linguagem: Inglês

10.1093/pasj/psx063

2053-051X

Satoshi Miyazaki, Yutaka Komiyama, Satoshi Kawanomoto, Yoshiyuki Doi, Hisanori Furusawa, Takashi Hamana, Yusuke Hayashi, Hiroyuki Ikeda, Yukiko Kamata, Hiroshi Karoji, Michitaro Koike, Tomio Kurakami, Shoken M. Miyama, Tomoki Morokuma, Fumiaki Nakata, Kazuhito Namikawa, Hidehiko Nakaya, Kyoji Nariai, Yoshiyuki Obuchi, Yukie Oishi, Norio Okada, Yuki Okura, Philip J. Tait, Tadafumi Takata, Yôko Tanaka, Masayuki Tanaka, Tsuyoshi Terai, Daigo Tomono, Fumihiro Uraguchi, Tomonori Usuda, Yousuke Utsumi, Yoshihiko Yamada, Hitomi Yamanoi, H. Aihara, Hiroki Fujimori, Sogo Mineo, Hironao Miyatake, Masamune Oguri, Tomohisa Uchida, M. Tanaka, Naoki Yasuda, Masahiro Takada, Hitoshi Murayama, Atsushi J. Nishizawa, Naoshi Sugiyama, Masashi Chiba, Toshifumi Futamase, Shiang‐Yu Wang, Hsin-Yo Chen, Paul T. P. Ho, Eric J.-Y. Liaw, Chi-Fang Chiu, Cheng-Lin Ho, Tsang-Chih Lai, Yao-Cheng Lee, D. Z. Jeng, Satoru Iwamura, R. Armstrong, Steve Bickerton, James Bosch, James E. Gunn, Robert H. Lupton, Craig Loomis, P. A. Price, S.G. Smith, Michael A. Strauss, Edwin L. Turner, Hisanori Suzuki, Yasuhito Miyazaki, Masaharu Muramatsu, Koei Yamamoto, Makoto Endo, Yutaka Ezaki, Noboru Ιτο, Noboru Kawaguchi, Satoshi Sofuku, Tomoaki Taniike, Kotaro Akutsu, Naoto Dojo, Kazuyuki Kasumi, Toru Matsuda, Kohei Imoto, Yoshinori Miwa, Masayuki Suzuki, Kunio Takeshi, Hideo Yokota,

Astronomy and Astrophysical Research

Abstract The 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${^{\prime\prime}_{.}}$2 (FWHM) in the HSC-i band over the entire 1${^{\circ}_{.}}$5 diameter field of view. The collimation of the camera with respect to the optical axis of the primary mirror is done with hexapod actuators, the mechanical accuracy of which is a few microns. Analysis of the remaining wavefront error in off-focus stellar images reveals that the collimation of the optical components meets design specifications. While there is a flexure of mechanical components, it also is within the design specification. As a result, the camera achieves its seeing-limited imaging on Maunakea during most of the time; the median seeing over several years of observing is 0${^{\prime\prime}_{.}}$67 (FWHM) in the i band. The sensors use p-channel, fully depleted CCDs of 200 μm thickness (2048 × 4176 15 μm square pixels) and we employ 116 of them to pave the 50 cm diameter focal plane. The minimum interval between exposures is 34 s, including the time to read out arrays, to transfer data to the control computer, and to save them to the hard drive. HSC on Subaru uniquely features a combination of a large aperture, a wide field of view, sharp images and a high sensitivity especially at longer wavelengths, which makes the HSC one of the most powerful observing facilities in the world.