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Basic characteristics of T-ReCS's imaging mode

T-ReCS is capable of imaging in the 8–26 micron range as follows:

  • Broad-band (N, Q) and Narrow-band Filter Imaging
  • Pixel size = 0.09" (fixed)
  • Field of view = 28.8"×21.6"
  • Number of filters: currently 20, capacity for 24
  • Occulting bar available for imaging (2" wide)

The principal T-ReCS imaging modes, plus the typical settings of five instrument components in each mode, are listed in the following table.

Mode Window Slit Filter Grating Detector
10 µm Imaging ZnSe Open or Occulting Bar N, Si1-Si6, narrow-band Imaging flat High-background
20 µm Imaging KRS-5 Open or Occultingbar Qa or Qb Imaging flat High-background

As with other mid-IR imagers and low resolution spectrographs, accurate cancellation of the sky and telescope background is most readily achieved by the technique of chopping and nodding. Currently the maximum chop throw allowed on Gemini is 15 arcsec, which is considerably smaller than the T-ReCS field of view.

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