FOCAS: The Faint Object Camera and Spectrograph for the Subaru Telescope
Nobunari Kashikawa(The Graduate University for Advanced Studies, SOKENDAI), Kentaro Aoki, Ryo Asai(The University of Tokyo), Noboru Ebizuka, Motoko Inata(Astronomical Observatory), Masanori Iye(The Graduate University for Advanced Studies, SOKENDAI), Koji S. Kawabata(Astronomical Observatory), George Kosugi, Youichi Ohyama, Kiichi Okita(Astronomical Observatory), Tomohiko Ozawa(Misato Observatory), Yoshihiko Saito(The University of Tokyo), Toshiyuki Sasaki, K. Sekiguchi, Yasuhiro Shimizu(Astronomical Observatory), Hiroko Taguchi(Tokyo Gakugei University), Tadafumi Takata, Yasushi Yadoùmaru(Misato Observatory), M. Yoshida(Astronomical Observatory)
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Abstract
Abstract The Faint Object Camera and Spectrograph (FOCAS) is a Cassegrain optical instrument for the Subaru Telescope. Its capabilities include $6^\prime \phi$ FOV direct imaging, low-resolution spectroscopy ($R=250 \hbox{--} 2000$ with ${0\rlap {.}{}^{\mathrm {\prime \prime }}4}$ slitwidth), multi-slit spectroscopy and polarimetry. We describe the overall design of FOCAS, its observing functions, and the performance verification procedures that have been carried out.
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