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.
Specifications
| Size | 250 x 150 x 130 mm |
| Weight | 1950 g |
| 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 |
| Channel | 1 | 2 | 3 | 4 |
| Band Center (cm-1) | 64.4 | 63.4 | 62.4 | 158.4 |
| Resolving Power | 130 | 409 | 130 | 405 |
| Detectors | stressed Ge:Ga | stressed Ge:Ga | stressed Ge:Ga | Ge:Ga |
| Optical through-put | 0.34 | 0.30 | 0.34 | 0.15 |
| 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 Number | 1 | 2 | ||
| Data | 155 mm Continuum | [CII] Line | ||
| Band Center | cm-1 | 64.4 | 63.4 | |
| mm | 155.3 | 157.7 | ||
| Resolution | cm-1 | 0.495 | (0.155) | |
| mm | 1.19 | (0.386) | ||
| Resolving Power | 130 | (409) | ||
| Beam Size (FWHM) | 8'x13' (scanning direction)x(cross-scanning direction) | |||
| System NEP | W Hz-1/2 | 1.8x10-16 | 6.0x10-17 | |
| Target | Continuum | [CII] Line | ||
| RMS Noise (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% | |||
| Pixel Size | 4'x4' | 4'x4' | ||
| 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.
FILM Explanatory Supplement [PDF]
- "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