The Keck Low-Resolution Imaging Spectrometer

Creators: Oke, J. B.; Cohen, J. G.; Carr, M.; Cromer, J.; Dingizian, A.; Harris, F. H.; Labrecque, S.; Lucinio, R.; Schaal, W.; Epps, H.; Miller, J.

Abstract

The Low Resolution Imaging Spectrometer (LRIS) for the Cassegrain focus of the Keck 10-m telescope on Mauna Kea is described. It has an imaging mode so it can also be used for taking direct images. The field of view in both spectrographic and imaging modes is 6 by 7.8 arcmin. It can be used with both conventional slits and custom-punched slit masks. The optical quality of the spectrograph is good enough to take full advantage of the excellent imaging properties of the telescope itself. The detector is a cooled back-illuminated Tektronics Inc. 2048 X 2048 CCD which gives a sampling rate of 4.685 pixels per arcsec. In the spectrographic mode the spectrograph has a maximum efficiency at the peak of the grating blaze of 32%-34% for the two lowest resolution gratings and 28% for the 1200 g mm^(-1) grating. This efficiency includes the detector but not the telescope or the atmosphere.

Additional Information

© Astronomical Society of the Pacific · Provided by the NASA Astrophysics Data System. Received 1994 November 16; accepted 1995 January 18. Funds to build the LRIS were provided by the California Association for Research in Astronomy. We wish to thank D. Hilyard and G. Pardeilhan of the Lick Observatory Optical Laboratory who fabricated the glass lens components and did the coupling of the optical surfaces. We wish to thank the Keck Observatory and particularly Dr. Tom Bida and the staff on the summit for providing generous and extensive help in testing the instrument. We also extend our thanks to Hal Petrie, Brad Butcher, Bill Douglas, Ernest Croner, Gaston Araya, and Caltech's Central Engineering Services for special assistance during the Commissioning phase. J.B.O. wishes to thank the Dominion Astrophysical Observatory for appointing him a Guest Worker and providing research support facilities.

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Published - 1995PASP__107__375O.pdf

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