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Proceedings Paper

Infrared camera and spectrograph for the SUBARU Telescope
Author(s): Alan T. Tokunaga; Klaus-Werner Hodapp; Joseph L. Hora; John T. Rayner; Yukiyasu Kobayashi; Toshinori Maihara; Tetsuya Nagata; Naomichi Kobayashi
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Paper Abstract

The optical design of a general-purpose 1 to 5 micrometers cryogenic IR camera and spectrograph (IRCS) for the 8.2-m Subaru telescope is described. The camera section serves the essential purpose of a slit-viewer in order to permit efficient use of the spectrograph on faint objects. It will also serve as a multipurpose IR camera. The spectrograph section will have a resolving power of (lambda) /(Delta) (lambda) equals 660 to 1600. 1 to 2.5 micrometers or 3 to 5 micrometers will be observed in a single exposure by using gratings and cross-dispersing prism combinations. The slit length will be 3 to 5'. The camera section will have 3 pixel scales (0'.030, 0'.056, and 0'.125) that provide high spatial imaging, 1:1 imaging (high throughput), and `wide-field' (about 2' X 2'). The spectrograph section will have 2 pixel scales: 0'.05/pixel and 0'.125/pixel. The important features of the IRCS are: (1) Two pixel scales are available, one matched to the tip-tilt secondary and the other matched to the adaptive optics system. (2) Switching between imaging and spectroscopic modes is possible. Therefore observational programs can be optimized for the seeing, availability of guide stars, and weather conditions. (3) In some cases deep imaging can be undertaken while long exposures are made in the spectroscopic mode.

Paper Details

Date Published: 1 June 1994
PDF: 8 pages
Proc. SPIE 2198, Instrumentation in Astronomy VIII, (1 June 1994); doi: 10.1117/12.176756
Show Author Affiliations
Alan T. Tokunaga, Univ. of Hawaii Institute for Astronomy (United States)
Klaus-Werner Hodapp, Univ. of Hawaii Institute for Astronomy (United States)
Joseph L. Hora, Univ. of Hawaii Institute for Astronomy (United States)
John T. Rayner, Univ. of Hawaii Institute for Astronomy (United States)
Yukiyasu Kobayashi, National Astronomical Observatory (Japan)
Toshinori Maihara, Kyoto Univ. (Japan)
Tetsuya Nagata, Kyoto Univ. (Japan)
Naomichi Kobayashi, Kyoto Univ. (Japan)


Published in SPIE Proceedings Vol. 2198:
Instrumentation in Astronomy VIII
David L. Crawford; Eric R. Craine, Editor(s)

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