A moderate-resolution, high-throughput CCD channel for the Multiple Mirror Telescope spectrograph

Computer Science – Performance

Scientific paper

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Charge Coupled Devices, Reflecting Telescopes, Spectrographs, Cameras, Imaging Techniques, Mirrors, Pixels

Scientific paper

A new spectrograph has been commissioned for use on the Multiple-Mirror Telescope (MMT). The instrument is a low-to-moderate-resolution CCD channel for the two-beam MMT spectrograph which has until now been operated only with a blue-sensitive photon-counting detector array. The new CCD channel offers very high throughput in a range of operating modes, including long-slit spectroscopy using a variety of single-order gratings, direct imaging, and cross-dispersed ('echellette') spectroscopy. The latter mode makes efficient use of the full format of a TI 800 x 800 CCD by providing complete spectral coverage from 4500 A to 1 micron in several spectral orders at a resolution between 80 and 250 km/s. The design philosophy, details, and performance of the instrument are discussed in the context of current needs and future plans for upgrade of the MMT to a single 6.5-m primary.

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