Infrared camera and spectrograph for the SUBARU Telescope

Alan T. Tokunaga; Klaus-Werner Hodapp; Joseph L. Hora; John T. Rayner; Yukiyasu Kobayashi; Toshinori Maihara; Tetsuya Nagata; Naomichi Kobayashi

doi:10.1117/12.176756

1 June 1994 Infrared camera and spectrograph for the SUBARU Telescope

Alan T. Tokunaga, Klaus-Werner Hodapp, Joseph L. Hora, John T. Rayner, Yukiyasu Kobayashi, Toshinori Maihara, Tetsuya Nagata, Naomichi Kobayashi

Author Affiliations +

Proceedings Volume 2198, Instrumentation in Astronomy VIII; (1994) https://doi.org/10.1117/12.176756
Event: 1994 Symposium on Astronomical Telescopes and Instrumentation for the 21st Century, 1994, Kailua, Kona, HI, United States

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.

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Alan T. Tokunaga, Klaus-Werner Hodapp, Joseph L. Hora, John T. Rayner, Yukiyasu Kobayashi, Toshinori Maihara, Tetsuya Nagata, and Naomichi Kobayashi "Infrared camera and spectrograph for the SUBARU Telescope", Proc. SPIE 2198, Instrumentation in Astronomy VIII, (1 June 1994); https://doi.org/10.1117/12.176756

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