IRTS observation of the mid-infrared spectrum of the zodiacal emission
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- Ootsubo T.
- Department of Astronomy, School of Science, University of Tokyo
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- Onaka T.
- Department of Astronomy, School of Science, University of Tokyo
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- Yamamura I.
- Department of Astronomy, School of Science, University of Tokyo
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- Tanabé T.
- Institute of Astronomy, Faculty of Science, University of Tokyo
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- Roellig T. L.
- NASA Ames Research Cente
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- Chan K.-W.
- NASA Ames Research Cente
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- Matsumoto T.
- Institute of Space and Astronautical Science
書誌事項
- タイトル別名
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- IRTS observation of the mid-infrared sp
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We present the mid-infrared spectrum (3-12 μm) of the zodiacal emission obtained by the Infrared Telescope in Space (IRTS), the first Japanese cryogenically cooled orbital infrared telescope. The Near-Infrared Spectrometer (NIRS) on board IRTS provided the spectrum of 3-4 μm, while that of 4.5-11.7 μm has been observed by the Mid-Infrared Spectrometer (MIRS). In this paper we present the data reduction and results of the observations by MIRS. Spectra of the background emission at high galactic latitudes (|b| > 30°) have been extracted from the MIRS observations by excluding point sources. The observed sky brightness has a clear dependence on the ecliptic latitude, indicating that the zodiacal emission dominates in the mid-infrared sky brightness. On the other hand, the spectral shape does not show any appreciable dependence on the ecliptic latitude for β = 0°-75°. The spectrum combining the NIRS and MIRS observations can be fitted by a grey body radiation at 250 K, but excess emission is seen in the 3-6 μm range. Alternatively, the spectrum of the zodiacal emission can be reproduced fairly well by a grey body at 280 K with an excess around 10 μm. In this case the excess may be attributed to a silicate emission band. Other than these excesses, no spectral features above the 10% level are seen in the MIRS spectrum.
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 50 (6-7), 507-511, 1998
地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会
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詳細情報 詳細情報について
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- CRID
- 1390282681485629952
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- NII論文ID
- 10002207006
- 130003955914
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- NII書誌ID
- AA11211921
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- COI
- 1:CAS:528:DyaK1cXntlSis74%3D
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- ISSN
- 18805981
- 13438832
- http://id.crossref.org/issn/13438832
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- NDL書誌ID
- 4552203
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可