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Multi-object spectroscopy of FOCAS: software and its performance

2003; SPIE; Volume: 4841; Linguagem: Inglês

10.1117/12.462588

1996-756X

Yoshihiko Saito, Youichi Ohyama, Nobunari Kashikawa, M. Yoshida, Toshiyuki Sasaki, George Kosugi, Tadafumi Takata, Yasuhiro Shimizu, Motoko Inata, Kiichi Okita, Kentaro Aoki, K. Sekiguchi, Koji S. Kawabata, Ryo Asai, Hiroko Taguchi, Noboru Ebizuka, Yasushi Yadoùmaru, Tomohiko Ozawa, Masanori Iye,

Adaptive optics and wavefront sensing

Faint Object Camera and Spectrograph, FOCAS, is a Cassegrain versatile optical instrument of Subaru telescope. Among various observing modes of FOCAS, the multi-object spectroscopy (MOS) requires dedicated software suite which enables accurate positioning of masks which have over fifty slitlets on faint targets over 6 arcminutes diameter field-of-view (FOV). We have been developing three kinds of software: the image processing software performing combining mosaic CCD images and optics distortion correction, mask designing program (MDP) for the slit arrangement, and pointing offset calculator (POC) for the target acquisition on slits. MDP and POC provide observers a graphical user interface (GUI) for efficient and quick mask designing and target acquisition. Our test has shown that the slit positioning accuracy on targets is about 0.2 arcsec RMS over entire FOV, and is accurate enough for typical observations with 0.4 arcsec slits or wider. We briefly describe our software as well as the pointing accuracy and the required time for the MOS target acquisition with FOCAS.