MIDI – the 10 μm instrument on the VLTI
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After more than five years of preparation, the mid-infrared interferometric instrument MIDI has been transported to Paranal where it will undergo testing and commissioning on theVery Large Telescope Interferometer VLTI from the end of 2002through large part of this year 2003. Thereafter it will be available as a user instrument to perform interferometric observations over the8 μm–13 μm wavelength range, with a spatial resolution of typically 20 milliarcsec, a spectral resolution of up to 250, and an anticipated point source sensitivity of N = 3–4 mag or 1–2.5 Jy for self –fringe tracking, which will be the only observing mode during the first months of operation. We describe the layout of the instrument, laboratory tests, and expected performance, both for broadband and spectrally resolved observing modes. We also briefly outline the planned guaranteed time observations.
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- Ligori, S., Graser, U., Grimm, B. and Klein, R.: 2002, in: Kona, W. Traub (ed.), Experiences with the Raethyon Si:As IBC Detector Arrays for Mid-IR Interferometric Observations, SPIE 4838, 774–785.Google Scholar
- Przygodda, F., Chesneau, O., Graser, U., Leinert, Ch. and Morel, S.: 2003, Interferometric observations at mid-infrared wavelengths with MIDI, these proceedingsGoogle Scholar