FIFI LS FIFI LS Science Goals

Some of the nice design features of FIFI LS

  • Two Light Paths: One light path for short wavelengths (45 - 110 microns) and one light path for long wavelengths (110 - 210 microns). This will allow simultaneous observations in the two bands.
  • Simultaneous Spatial Imaging: 35" x 35" and 70" x 70" field of view, for each light path respectively. Each field of view resolved with 5 x 5 pixels.
  • 3-D Imaging Capability: Simultaneous imaging in both spatial (2-D on the plane of the sky) and spectral (in different wavelength channels) domains for all 25 pixels in each band.
  • Good Spectral Resolution: Spectral resolution of R = 1000 - 2000 in each band (this corresponds to a velocity resolution of 150 - 300 km/s). Each of the 25 spatial pixels has 16 pixels of spectral resolution. This resolution is required to resolve spectral features in astronomical sources, especially galaxies.
  • Instantaneous Spectral Coverage: Spectral band coverage of 1500 km/s will allow FIFI LS to cover the velocity distribution in entire galaxies and provide good baseline coverage on both sides of any spectral line in both bands.
  • 2 Ge:Ga Photoconductor Arrays: 25x16 pixels each (an unstressed array for short wavelengths, 40 - 110 Microns, and a stressed array for long wavelengths, 110 - 220 Microns).
  • Long-Slit, Littrow-Mount Grating Spectrographs: One for each spectrometer, operating in 1st or 1st/2nd order (for the short and long wavelength bands respectively).

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