FILM : Far-Infrared Line Mapper
The Far-Infrared Line Mapper (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.
|Size||250 x 150 x 130 mm|
|Grating||a varied line-space cylindrically concave grating|
|Beam size (FWHM)||8' (dispersion direction) x 13'|
|Area to be observed||10-20% of the sky|
|Band Center (cm-1)||64.4||63.4||62.4||158.4|
|Detectors||stressed Ge:Ga||stressed Ge:Ga||stressed Ge:Ga||Ge:Ga|
|S (detector) (A/W)||10.1||11.1||9.7||0.51|
|System NEP (10-16 W/Hz1/2)||1.8||0.60||1.7||12|
FILM Archive Data Executive Summary
|Data||155 mm Continuum||[CII] Line|
|Beam Size (FWHM)||8'x13'|
(scanning direction)x(cross-scanning direction)
|System NEP||W Hz-1/2||1.8x10-16||6.0x10-17|
(without stripe noise)
|in nIn||W m-2 sr-1||2x10-7|
|in In||MJy sr-1||10|
|Uncertainty in Zero Level|
(including stripe noise)
|in nIn||W m-2 sr-1||6x10-7|
|in In||MJy sr-1||30|
|Uncertainty in Intensity Scale||-19% to +26%|
|Number of Pixel||192x192||192x192|
|Image Size||12.8 deg x12.8 deg||12.8 deg x12.8 deg|
|Uncertainty in Map Position||4'-8'||4'-8'|
For more details, refer to the following documents.
- "Flight performance of the Far-Infrared Line Mapper (FILM)"
H. Shibai, T. Nakagawa, H. Okuda, S. Makiuti, H. Matsuhara, K. Okumura, N. Hiromoto, Y. Doi, and T. Tohya
1996, in SPIE Proc.2817, Infrared Spaceborne Remote Sensing IV ed. M. S. Scholl and B. F. Andresen, p.267-275
- "Far-Infrared Line Mapper (FILM) on the Infrared Telescope in Space"
Hiroshi Shibai, Masao Yui, Hideo Matsuhara, Norihisa Hiromoto, Takao Nakagawa, and Haruyuki Okuda
1994, The Astrophysical Journal, vol.428, p.377-383