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GNIRS Grating Usage: Long Camera and 110 l/mm Grating
Resolving power: |
17800 with 0.1 arcsec (2 pixel) slit |
Typical uses: |
(1) High resolution spectra with 49 arcsec long slit This mode provides the highest resolution obtainable with GNIRS when the smallest slit (0.1") is used. It is most useful when observing fairly bright objects, or in very good image quality conditions. Without the benefit of an AO system, the slit losses can be prohibitive. Wavelength coverage is about one third of that with the long camera and the 32 l/mm grating (or the short camera and the 110 l/mm grating); several settings are required to cover each atmospheric window. Spectra of a K1 giant (BS6913) obtained at example grating settings are shown below, with central wavelength: 1.63um (4th order) and 2.22um (3rd order).
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Example spectra and other figures: |
| Fig 1a: high-res long-slit spectrum in 4th order (H window, central wavelength 1.63um) |
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| Fig 1b: high-res long-slit spectrum in 3rd order (K-window, central wavelength 2.22um) |
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Last update August 30, 2004; B. Rodgers