Infrared spectroscopy with a VLT

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Spectroscopy, Infrared Astronomy, Infrared Spectroscopy, Infrared Telescopes, Infrared Spectrometers, Signal To Noise Ratios, Spaceborne Telescopes, Spectral Resolution

Scientific paper

Attention is given to factors influencing the signal-to-noise ratios achievable in Very Large Telescope-based IR spectroscopy. Optimum performance in the thermal IR requires not only a low emissivity telescope, but one that is on a cold, dry site with excellent seeing. The core spectrometer will probably be a cooled grating/array instrument. Matching problems are not anticipated with telescopes in the 8-10 m-diameter class. The telescope image quality (on axis), and the tracking/guiding accuracy, must be compatible with the use of narrow slits.

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