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Proceedings Paper

Astronomical longslit spectrograph utilizing a 256x256 InSb focal plane array
Author(s): Richard R. Joyce; Albert M. Fowler; Gerald B. Heim
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Paper Abstract

The Cryogenic Spectrometer (CRSP) is a longslit astronomical spectrograph which has been in service at Kitt Peak National Observatory since 1988, utilizing a 58 x 62 Santa Barbara Research Corporation InSb array in the dispersive focal plane. We have recently completed an extensive upgrade to the instrument which includes: installation of a SBRC 256 x 256 InSb array in the focal plane. CRSP is thus the first astronomical IR spectrograph to utilize the new 256 x 256 InSb focal plane. By comparison to the 62 x 58 focal plane, the 256 x 256 array has significantly less dark current (<1 e/s vs 50 e/s) and lower read noise (30 vs 350 electrons for a single read), resulting in improved performance for low background observations. In addition, the smaller pixels yield plate scales which are well- suited to sampling the typical seeing at Kitt Peak. This yields significant gains in the reduction of systematic errors associated with the extraction of point-source spectra against the challenging background of the IR night sky, which is dominated by emission lines of OH and by thermal emission from telluric absorption lines at wavelengths > 2.3 micrometers .

Paper Details

Date Published: 1 June 1994
PDF: 11 pages
Proc. SPIE 2198, Instrumentation in Astronomy VIII, (1 June 1994); doi: 10.1117/12.176722
Show Author Affiliations
Richard R. Joyce, National Optical Astronomy Observatories (United States)
Albert M. Fowler, National Optical Astronomy Observatories (United States)
Gerald B. Heim, National Optical Astronomy Observatories (United States)

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

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