Slow-scan performance of the far-infrared surveyor (FIS) onboard AKARI

Mai Shirahata, Shuji Matsuura, Sunao Hasegawa, Takafumi Ootsubo, Sin'itirou Makiuti, Issei Yamamura, Takao Nakagawa, Hidehiro Kaneda, Yasuo Doi, Mitsunobu Kawada, Hiroshi Shibai, Thomas Müller, Martin Cohen

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We present the in-orbit performance of slow-scan observation of the Far-Infrared Surveyor (FIS) onboard the AKARI satellite. The FIS, one of the two focal-plane instruments of AKARI, has four photometric bands from 50-180 μm with two kinds of Ge:Ga array detectors. In addition to the All-Sky Survey, the FIS also took images of specific targets by the slow-scan. Because of the longer exposure time on a targeted source, the sensitivity in the slow-scan mode is 1-2 orders of magnitude better than that in the All-Sky Survey mode. In order to evaluate the point spread functions (PSFs), several bright point-like objects such as asteroids, stars, and galaxies were observed. Though significant enhancements are seen at the tails of the PSFs, the derived full width at the half maximum (FWHM) are consistent with those expected from the optical simulation and the laboratory measurements; ∼40″ for two shorter wavelength bands and ∼60″ for two longer wavelength bands, respectively. The absolute photometric calibration has been performed by observing well established photometric calibration standards (asteroids and stars) in a wide range of fluxes. After the establishment for the method of the aperture photometry, the photometric accuracy for point sources is less than 10% in all bands.

Original languageEnglish
Title of host publicationSpace Telescopes and Instrumentation 2008
Subtitle of host publicationOptical, Infrared, and Millimeter
Publication statusPublished - 2008 Dec 1
EventSpace Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter - Marseille, France
Duration: 2008 Jun 232008 Jun 28

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherSpace Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter


  • Akari
  • Calibrtion
  • Far-infrared
  • Ge:Ga photoconductive detector
  • Photometory

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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