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IRTS observation of the mid-infrared spectrum of the zodiacal emission
Earth, Planets and Space volume 50, pages507–511(1998)
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 ß = 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.
Cohen, M., F. C. Witteborn, T. Roush, J. Bregman, and D. Wooden, Spectral irradiance calibration in the infrared. VIII. 5–14 μm spectroscopy of the asteroids, Ceres, Vesta, and Pallas, Astron. J., 115, 1671–1679, 1998.
Draine, B. T. and H. M. Lee, Optical properties of interstellar graphite and silicate grains, Astrophys. J., 285, 89–108, 1984.
Dumont, R. and A.-C. Levasseur-Regourd, Properties of interplanetary dust from infrared and optical observations, Astron. Astrophys., 191, 154–160, 1988.
Dwek, E., R. G. Arendt, D. J. Fixsen, T. J. Sodroski, N. Odegard, J. L. Weiland, W. T. Reach, M. G. Hauser, T. Kelsall, S. H. Moseley, R. F. Silverberg, R. A. Shafer, J. Ballester, D. Bazell, and R. Isaacman, Detection and characterization of cold intersteller dust and polycyclic aromatic hydrocarbon emission, from COBE observations, Astrophys. J., 475, 565–579, 1997.
Giese, R. H. and B. Kneissel, Three-dimensional models of the zodiacal dust cloud, Icarus, 81, 369–378, 1989.
Grün, E., H. A. Zook, H. Fechtig, and R. H. Giese, Collisional balance of the meteoritic complex, Icarus, 62, 244–272, 1985.
Hauser, M. G. and J. R. Houk, The zodiacal background in the IRAS data, in Proceedings of Light on Dark Matter, edited by F. P. Israel, pp. 39–44, Reidel, Dordrecht, 1984.
Hong, S. S. and I. K. Um, Inversion of the zodiacal infrared brightness integral, Astrophys. J., 320, 928–935, 1987.
Matsumoto, T., M. Kawada, H. Murakami, M. Noda, S. Matsuura, M. Tanaka, and K. Narita, IRTS observation of the near-infrared spectrum of the zodiacal light, Publ. Astron. Soc. Japan, 48, L47–L51, 1996.
Mattila, K., D. Lemke, L. K. Haikala, R. J. Laureijs, A. Léger, K. Lehtinen, Ch. Leinert, and P. G. Mezger, Spectrophotometry of UIR bands in the diffuse emission of the galactic disk, Astron. Astrophys., 315, L353–L356, 1996.
Murakami, H., M. M. Freund, K. Ganga, H. Guo, T. Hirao, N. Hiromoto, M. Kawada, A. E. Lange, S. Makiuti, H. Matsuhara, T. Matsumoto, S. Matsuura, M. Murakami, T. Nakagawa, M. Narita, M. Noda, H. Okuda, K. Okumura, T. Onaka, T. L. Roellig, S. Sato, H. Shibai, B. J. Smith, T. Tanabé, M. Tanaka, T. Watabe, I. Yamamura, and L. Yuen, The IRTS (Infrared Telescope in Space) mission, Publ. Astron. Soc. Japan, 48, L41–L46, 1996.
Murdock, T. L. and S. D. Price, Infrared measurements of zodiacal light, Astron. J., 90, 375–386, 1985.
Onaka, T., I. Yamamura, T. Tanabé, T. L. Roellig, and L. Yuen, Detection of the mid-infrared unidentified bands in the diffuse galactic emission by IRTS, Publ. Astron. Soc. Japan, 48, L59–L63, 1996.
Onaka, T. and the IRTS team, IRTS observations of the unidentified infrared bands in the diffuse galactic light, in Proceedings of the Diffuse Infrared Radiation and the IRTS, ASP Conference Series Vol. 124, edited by H. Okuda, T. Matsumoto, and T. L. Roellig, pp. 170–177, 1997.
Reach, W. T., Zodiacal emission I. Dust near the earth’s orbit, Astrophys. J., 335, 468–485, 1988.
Reach, W. T., Zodiacal emission III. Dust near the asteroid belt, Astrophys. J., 392, 289–299, 1992.
Reach, W. T., The structured zodiacal light: IRAS, COBE, and ISO observations, in Proceedings of the Diffuse Infrared Radiation and the IRTS, ASP Conference Series Vol. 124, edited by H. Okuda, T. Matsumoto, and T. L. Roellig, pp. 33–40, 1997.
Reach, W. T., B. A. Franz, T. Kelsall, and J. L. Weiland, DIRBE observations of the zodiacal light, in Proceedings of Unveiling the Cosmic Infrared Background, AIP Conference Series Vol. 348, edited by E. Dwek, pp. 37–46, College Park, MD, 1996a.
Reach, W. T., A. Abergel, F. Boulanger, F.-X. Désert, M. Perault, J.-P. Bernard, J. Blommaert, C. Cesarsky, D. Cesarsky, L. Metcalfe, J.-L. Puget, F. Sibille, and L. Vigroux, Mid-Infrared spectrum of the zodiacal light, Astron. Astrophys., 315, L381–L384, 1996b.
Roellig, T. L., T. Onaka, T. J. McMahon, and T. Tanabé, The Mid-Infrared Spectrometer on the Infrared Telescope in Space (IRTS) mission, Astrophys. J., 428, 370–376, 1994.
Roellig, T. L., K. Mochizuki, T. Onaka, T. Tanabé, I. Yamamura, and L. Yuen, Flight Performance of the Mid-Infrared Spectrometer on the Infrared Telescope in Space mission, Proc SPIE, 2817, 258–266, 1996.
Tanabé, T., I. Yamamura, T. Onaka, K.-W. Chan, T. L. Roellig, and M. Cohen, The absolute sensitivity calibration of the IRTS/MIRS, in Proceedings of the Diffuse Infrared Radiation and the IRTS, ASP Conference Series Vol. 124, edited by H. Okuda, T. Matsumoto, and T.L. Roellig, pp. 25–30, 1997.
Yamamura, I. and the IRTS team, Point source observations by the IRTS, in Proceedings of the Diffuse Infrared Radiation and the IRTS, ASP Conference Series Vol. 124, edited by H. Okuda, T. Matsumoto, and T. L. Roellig, pp. 72–81, 1997.
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Ootsubo, T., Onaka, T., Yamamura, I. et al. IRTS observation of the mid-infrared spectrum of the zodiacal emission. Earth Planet Sp 50, 507–511 (1998). https://doi.org/10.1186/BF03352142
- NIRS Spectrum
- Galactic Latitude
- Grey Body
- Zodiacal Light