Calibration of the AKARI far-infrared imaging Fourier-transform spectrometer

Noriko Murakami, Mitsunobu Kawada, Hidenori Takahashi, Yoko Okada, Akiko Yasuda, Takafumi Ootsubo, Hidehiro Kaneda, Hiroshi Matsuo, Jean Paul Baluteau, Peter Davis-Imhof, Brad G. Gom, David A. Naylor, Annie Zavagno, Issei Yamamura, Shuji Matsuura, Mai Shirahata, Yasuo Doi, Takao Nakagawa, Hiroshi Shibai

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


The Far-Infrared Surveyor (FIS) onboard the AKARI satellite has a spectroscopic capability provided by a Fourier transform spectrometer (FIS-FTS). FIS-FTS is the first space-borne imaging FTS dedicated to far-infrared astronomical observations. We describe the calibration process of the FIS-FTS, and discuss its accuracy and reliability. The calibration is based on observational data of bright astronomical sources as well as two instrumental sources. We have compared the FIS-FTS spectra with the spectra obtained from the LongWavelength Spectrometer (LWS) of the Infrared Space Observatory (ISO), having a similar spectral coverage. The present calibration method accurately reproduces the spectra of several solar system objects having a reliable spectral model. Under this condition the relative uncertainty of the calibration of the continuum is estimated to be ±?15% for SW, ±10% for 70- 85 cm-1 of LW, and ?20% for 60-70cm-1 of LW; and the absolute uncertainty is estimated to be +35%/-55% for SW, +35%/-55% for 70-85cm-1 of LW, and +40%/-60% for 60-70cm-1 of LW. These values have been confirmed by comparisons with theoretical models and previous observations by the ISO/ LWS.

Original languageEnglish
Pages (from-to)1155-1166
Number of pages12
JournalPublications of the Astronomical Society of Japan
Issue number5
Publication statusPublished - 2010 Oct 25
Externally publishedYes


  • Infrared: General
  • Instrumentation: Spectrometer
  • Methods: Data analysis
  • Space vehicles: Instruments

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'Calibration of the AKARI far-infrared imaging Fourier-transform spectrometer'. Together they form a unique fingerprint.

Cite this