Infrared camera and spectrograph for the SUBARU Telescope

Details Infrared camera and spectrograph for the SUBARU Telescope Infrared camera and spectrograph for the SUBARU Telescope

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994spie.2198..438t&link_type=abstract

Proc. SPIE Vol. 2198, p. 438-445, Instrumentation in Astronomy VIII, David L. Crawford; Eric R. Craine; Eds.

Astronomy and Astrophysics

Astronomy

1

Scientific paper

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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