COSMIC: A Multiobject Spectrograph and Direct Imaging Camera for the 5 Meter Hale Telescope Prime Focus

Details COSMIC: A Multiobject Spectrograph and Direct Imaging Camera for the 5 Meter Hale Telescope Prime Focus COSMIC: A Multiobject Spectrograph and Direct Imaging Camera for the 5 Meter Hale Telescope Prime Focus

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pasp..110.1487k&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 110, Issue 754, pp. 1487-1498.

Astronomy and Astrophysics

Astronomy

37

Instrumentation: Spectrographs, Methods: Observational

Scientific paper

We describe the design, construction, and operation of the Carnegie Observatories Spectroscopic Multislit and Imaging Camera (COSMIC) for the prime focus of the Hale 5 m telescope at Palomar Observatory. COSMIC is a reimaging grism spectrograph with a 13.65 arcmin square field of view, which can also be used as a direct imaging camera with a 9.75 arcmin square field of view. The wavelength coverage extends from 350 nm to almost 1 μm the detector is a thinned, back-illuminated SITe 2048x2048 CCD with high quantum efficiency and excellent cosmetics. Multislit aperture masks are produced photographically, with spectra of up to ~50 objects fitted on a single row of a slit mask. The instrument exhibits very little flexure and uses an active thermal control to maintain focus over a wide range of ambient temperature. In direct mode COSMIC is typically used with Kron-Cousins, Gunn, and narrow bandpass filters. The instrument achieves throughputs of greater than 50% for direct imaging and, in spectroscopic mode, a peak efficiency at 5500 Å of slightly better than 24% of light falling on the 5 m mirror. COSMIC is optimized for faint-object imaging, down to Gunn r=26 mag, and multiobject spectroscopy, down to r=23 mag, with typically 30 objects per spectroscopic exposure.

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