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The Far-Infrared Surveyor (FIS) for AKARI
Journal article

The Far-Infrared Surveyor (FIS) for AKARI

Mitsunobu Kawada, Hajime Baba, Peter D. Barthel, David Clements, Martin Cohen, Yasuo Doi, Elysandra Figueredo, Mikio Fujiwara, Tomotsugu Goto, Sunao Hasegawa, …
Publications of the Astronomical Society of Japan, Vol.59(SPEC. ISS. 2)
2007

Abstract

Infrared: general Instrumentation: detectors Vehicles: instruments
The Far-Infrared Surveyor (FIS) is one of two focal-plane instruments on the AKARI satellite. FIS has four photometric bands at 65, 90, 140, and 160 μm, and uses two kinds of array detectors. The FTS arrays and optics are designed to sweep the sky with high spatial resolution and redundancy. The actual scan width is more than eight arcminutes, and the pixel pitch matches the diffraction limit of the telescope. Derived point-spread functions (PSFs) from observations of asteroids are similar to those given by the optical model. Significant excesses, however, are clearly seen around tails of the PSFs, whose contributions are about 30% of the total power. All FIS functions are operating well in orbit, and the performance meets the laboratory characterizations, except for the two longer wavelength bands, which are not performing as well as characterized. Furthermore, the FIS has a spectroscopic capability using a Fourier transform spectrometer (FTS). Because the FTS takes advantage of the optics and detectors of the photometer, it can simultaneously make a spectral map. This paper summarizes the in-flight technical and operational performance of the FIS. © 2007. Astronomical Society of Japan.

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