Three-dimensional spectroscopy has the advantage of providing (quasi-) simultaneously both spatial and spectral information. Coupled to adaptive optics, it conjugates spectroscopic power with high angular resolution. GriF offers these capabilities in the near-infrared. As a new observing mode of KIR, the camera behind PUEO, the Canada-France-Hawaii Telescope adaptive optics bonnette, it provides images at the diffraction limit of the telescope in the K band. Spectroscopy at a resolution of 2000 is provided by a Fabry-Pérot interferometer coupled with a grism, cooled to limit the background. This setup offers a large multiplex gain by observing simultaneously up to five monochromatic images. This article first describes the instrument and the calibration procedures. Next, we demonstrate GriF performances from its first observations, obtained on the Orion molecular cloud OMC-1.
The GraF instrument using a Fabry-Perot interferometer cross-dispersed with a grating was one of the first integral-field and long-slit spectrographs built for and used with an adaptive optics system. We describe its concept, design, optimal observational procedures and the measured performances. The instrument was used in 1997-2001 at the ESO 3.6 m telescope equipped with ADONIS adaptive optics and SHARPII+ camera. The operating spectral range was 1.2 -2.5 µm. We used the spectral resolution from 500 to 10 000 combined with the angular resolution of 0.1 ′′ -0.2 ′′ . The quality of GraF data is illustrated by the integral field spectroscopy of the complex 0.9 ′′ × 0.9 ′′ central region of η Car in the 1.7 µm spectral range at the limit of spectral and angular resolutions.
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