A Near-Infrared Integral Field Spectrograph for the Palomar 200-inch Telescope

Details A Near-Infrared Integral Field Spectrograph for the Palomar 200-inch Telescope A Near-Infrared Integral Field Spectrograph for the Palomar 200-inch Telescope

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.0910m&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #09.10; Bulletin of the American Astronomical Society, Vol. 29, p.1225

Astronomy and Astrophysics

Astronomy

Scientific paper

An integral field spectrograph is currently under construction to operate at near-infrared wavelengths on the 200-inch Telescope at Palomar. The spectrograph incorporates an eight-element, all-reflective image slicer to transform the two-dimensional field into a pair of long slits. The field of view is roughly 6''x 10'' on the sky, covered by eight 0.67''x 10'' slits. Diamond-turned aluminum surfaces form the optical elements in the all-aluminum image slicer assembly. The movable reflection grating has two faces, delivering spectral resolutions of 450 and 200 km s(-1) . The spectrograph, mounted at the f/70 Cassegrain focus, produces a dispersed f/70 image plane that is fed into an existing near-infrared camera. While the design favors the use of the camera employing a 256x256 HgCdTe array, a similar camera with a 256x256 InSb array may also be used, extending the wavelength coverage of the spectrograph out to 5mu m. The spectral coverage in the high resolution mode is > 4000 km s(-1) , with roughly double that in the low resolution mode. A mirror can be placed in front of the grating providing the capability for direct imaging through the spectrograph in order to facilitate target acquisition.

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