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The coexistence of spectral features of dust particles and of ionized gas as found in IRAS data

  • M. de Muizon
  • H. J. Habing
Part IV: Miscellaneous Related Topics
Part of the Lecture Notes in Physics book series (LNP, volume 237)

Abstract

We present some preliminary data obtained by the Low Resolution Spectrometer onboard IRAS, in the wavelength range 8–22.5 um. Spectra of about 900 point sources brighter than 20 Jy at 12 μm and than 100 Jy at 25 um have been examined. Two thirds of the sample could be classified according to the shape of their spectra. Emission lines are seen in the spectra of 118 sources, of which 98 (83%) show the “unidentified” 11.3 um feature, together with the 7.7 um and 8.6 μm, assumed to be due to dust particles. Among these latter sources, 90% also show the [NeII]12.8 um line, and 50% show in addition the [SIII]18.7 um line.

This suggests that the “unidentified dust features” occur frequently in strong compact infrared sources, and mainly in regions where the dust is associated with ionized gas.

Keywords

Emission Feature Planetary Nebula Objective Prism Reflection Nebula IRAS Data 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • M. de Muizon
    • 1
    • 2
  • H. J. Habing
    • 1
  1. 1.Sterrewacht LeidenRA LeidenNederland
  2. 2.Observatoire de ParisFrance

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