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Proceedings Paper

Multi-object spectroscopy of FOCAS: software and its performance
Author(s): Yoshihiko Saito; Youichi Ohyama; Nobunari Kashikawa; Michitoshi Yoshida; Toshiyuki Sasaki; George Kosugi; Tadafumi Takata; Yasuhiro Shimizu; Motoko Inata; Kiichi Okita; Kentaro Aoki; Kazuhiro Sekiguchi; Koji S. Kawabata; Ryo Asai; Hiroko Taguchi; Noboru Ebizuka; Yasushi Yadoumaru; Tomohiko Ozawa; Masanori Iye
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Paper Abstract

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.

Paper Details

Date Published: 7 March 2003
PDF: 9 pages
Proc. SPIE 4841, Instrument Design and Performance for Optical/Infrared Ground-based Telescopes, (7 March 2003); doi: 10.1117/12.462588
Show Author Affiliations
Yoshihiko Saito, National Astronomical Observatory of Japan (Japan)
Youichi Ohyama, Subaru Telescope/NAOJ (United States)
Nobunari Kashikawa, National Astronomical Observatory of Japan (Japan)
Michitoshi Yoshida, Okayama Astrophysical Observatory/NAOJ (Japan)
Toshiyuki Sasaki, Subaru Telescope/NAOJ (United States)
George Kosugi, Subaru Telescope/NAOJ (United States)
Tadafumi Takata, Subaru Telescope/NAOJ (United States)
Yasuhiro Shimizu, Okayama Astrophysical Observatory/NAOJ (Japan)
Motoko Inata, Okayama Astrophysical Observatory/NAOJ (Japan)
Kiichi Okita, Okayama Astrophysical Observatory/NAOJ (Japan)
Kentaro Aoki, Suabaru Telescope/NAOJ (United States)
Kazuhiro Sekiguchi, Subaru Telescope/NAOJ (United States)
Koji S. Kawabata, National Astronomical Observatory of Japan (Japan)
Ryo Asai, Systems Engineering Consultants Co., Ltd. (Japan)
Hiroko Taguchi, Waseda Jitsugyo (Japan)
Noboru Ebizuka, The Institute of Physical and Chemical Research-RIKEN (Japan)
Yasushi Yadoumaru, Misato Observatory (Japan)
Tomohiko Ozawa, Misato Observatory (Japan)
Masanori Iye, National Astronomical Observatory of Japan (Japan)

Published in SPIE Proceedings Vol. 4841:
Instrument Design and Performance for Optical/Infrared Ground-based Telescopes
Masanori Iye; Alan F. M. Moorwood, Editor(s)

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