IRTS observation of the mid-infrared spectrum of the zodiacal emission

Details IRTS observation of the mid-infrared spectrum of the zodiacal emission IRTS observation of the mid-infrared spectrum of the zodiacal emission

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998ep%26s...50..507o&link_type=abstract

Earth, Planets and Space, Volume 50, p. 507-511.

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9

Scientific paper

We present the mid-infrared spectrum (3-12 mm) 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 3-4mm, while that of 4.5-11.7mm 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 b= 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 3-6mm range. Alternatively, the spectrum of the zodiacal emission can be reproduced fairly well by a grey body at 280K with an excess around 10mm . 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.

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