We have developed a Far-Infrared Line Mapper (FILM:
Shibai et al. 1994, Shibai et al. 1996; see IRSA IRTS
Bibliography Listing)
as one of the four focal plane instruments on the
Infrared Telescope in Space (
IRTS). The FILM is a grating
spectrometer designed to simultaneously measure (C II)
158 microns and (O I) 63 microns line intensities and
continuum emission near the (C II) line with spatial
resolution of 8 arcmin. Very high sensitivity and
accuracy are achieved by using stressed and unstressed
Ge: Ga detectors at 1.8 K with a helium cooled
telescope and by using a spectral scanner to
distinguish the line emission from the continuum
emission. Line intensities of the (C II) and the (O I)
will be mapped over 10% of the sky with much higher
sensitivity than the previous survey measurements.
What's the FILM !?