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Proceedings Paper

Data reduction techniques for slit and slit-less spectroscopy of diffuse emission with the Infrared Camera onboard AKARI
Author(s): Itsuki 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 Usui; Hidenori Watarai; Martin Cohen
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Paper 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 0th to 1st order light as well as the efficiency profiles of the 2nd 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.

Paper Details

Date Published: 12 July 2008
PDF: 10 pages
Proc. SPIE 7010, Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter, 70102Y (12 July 2008); doi: 10.1117/12.788696
Show Author Affiliations
Itsuki Sakon, Univ. of Tokyo (Japan)
Takashi Onaka, Univ. of Tokyo (Japan)
Takehiko Wada, Institute of Space and Astronautical Science, JAXA (Japan)
Youichi Ohyama, Institute of Space and Astronautical Science, JAXA (Japan)
Hideo Matsuhara, Institute of Space and Astronautical Science, JAXA (Japan)
Naofumi Fujishiro, Univ. of Tokyo (Japan)
Daisuke Ishihara, Univ. of Tokyo (Japan)
Yoshifusa Ita, Institute of Space and Astronautical Science, JAXA (Japan)
Hidehiro Kaneda, Institute of Space and Astronautical Science, JAXA (Japan)
Hirokazu Kataza, Institute of Space and Astronautical Science, JAXA (Japan)
Woojung Kim, Institute of Space and Astronautical Science, JAXA (Japan)
Toshio Matsumoto, Institute of Space and Astronautical Science, JAXA (Japan)
Hiroshi Murakami, Institute of Space and Astronautical Science, JAXA (Japan)
Takao Nakagawa, Institute of Space and Astronautical Science, JAXA (Japan)
Shinki Oyabu, Institute of Space and Astronautical Science, JAXA, (Japan)
Toshihiko Tanabe, Institute of Astronomy, Univ. of Tokyo (Japan)
Toshinobu Takagi, Institute of Space and Astronautical Science, JAXA (Japan)
Kazunori Uemizu, Institute of Space and Astronautical Science, JAXA (Japan)
Munetaka Ueno, Univ. of Tokyo (Japan)
Fumihiko Usui, Institute of Space and Astronautical Science, JAXA (Japan)
Hidenori Watarai, Office of Space Applications, JAXA (Japan)
Martin Cohen, Univ. of California, Berkeley (United States)


Published in SPIE Proceedings Vol. 7010:
Space Telescopes and Instrumentation 2008: Optical, Infrared, and Millimeter
Jacobus M. Oschmann; Mattheus W. M. de Graauw; Howard A. MacEwen, Editor(s)

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