Data reduction techniques for slit and slit-less spectroscopy of diffuse emission with the infrared camera onboard akari

Ituski Sakon, Takashi Onaka, Takehiko Wada, Youichi Ohyama, Hideo Matsuhara, Naofumi Fujishiro, Daisuke Ishihara, Yoshifusa Ita, Hidehiro Kaneda, Hirokazu Kataza, Woojung Kim, Toshio Matsumoto, Hiroshi Murakami, Takao Nakagawa, Shinki Oyabu, Toshihiko Tanabe, Toshinobu Takagi, Kazunori Uemizu, Munetaka Ueno, Fumihiko UsuiHidenori Watarai, Martin Cohen

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

2 Citations (Scopus)

Abstract

Infrared Camera (IRC) onboard AKARI satellite has carried out more than 4000 pointed observations during the phases 1 and 2, a significant amount of which were performed in the spectroscopic mode. In this paper, we investigate the properties of the spectroscopic data taken with MIR-S channel and propose a new data reduction procedure for slit-less spectroscopy of sources embedded in complicated diffuse background structures. The relative strengths of the 0 th to 1 st order light as well as the efficiency profiles of the 2 nd order light are examined for various objects taken with MIR-S dispersers. The boundary shapes of the aperture mask are determined by using the spectroscopic data of uniform zodiacal emission. Based on these results, if the appropriate template spectra of zodiacal light emission and the diffuse background emission are prepared and the geometries of the diffuse structures are obtained by the imaging data, we can reproduce the slit-less spectroscopic patterns made by a uniform zodiacal emission and the diffuse background emission by a convolution of those template profiles. This technique enables us to obtain the spectra of infrared sources in highly complicated diffuse background and/or foreground structures, such as in the Galactic plane and in nearby galaxies.

Original languageEnglish
Title of host publicationSpace Telescopes and Instrumentation 2008
Subtitle of host publicationOptical, Infrared, and Millimeter
DOIs
Publication statusPublished - 2008 Dec 1
Externally publishedYes
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
Volume7010
ISSN (Print)0277-786X

Other

OtherSpace Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter
CountryFrance
CityMarseille
Period08/6/2308/6/28

Keywords

  • Akari satellite
  • Grating prism
  • Infrared camera (IRC)
  • Slit-less spectroscopy

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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