The effect of multiple grain components on infrared radiation transfer and the 10 micron silicate feature

Details The effect of multiple grain components on infrared radiation transfer and the 10 micron silicate feature The effect of multiple grain components on infrared radiation transfer and the 10 micron silicate feature

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...220..165s&link_type=abstract

Astrophysical Journal, Part 1, vol. 220, Feb. 15, 1978, p. 165-170.

Astronomy and Astrophysics

Astronomy

7

Infrared Radiation, Interstellar Matter, Radiative Transfer, Silicates, Chemical Composition, Extinction, H Ii Regions, Radio Sources (Astronomy), Thermal Emission

Scientific paper

Interstellar dust is composed of several types of grains which have different sizes and chemical compositions. The presence of different grain components affects radiative transfer in infrared sources, both for the general continuum emission and for the narrower spectral features. The 10-micron silicate feature is particularly affected; it is shown that a silicate absorption feature can occur in an emitting region in which all grain temperatures are constant along the line of sight. As many as two optical depths of silicate absorption can be produced even if the color temperature at 10 microns is high, the optical depth of the emitting grains is low, and no spatial temperature gradients are present. A 'multigrain' model for the silicate feature is successfully compared with observations of the Orion ionization-front source and a recently observed set of southern H II regions. A previously derived observational relation between formaldehyde optical depth to the H II regions and the reduced silicate optical depth is shown to follow naturally from this multigrain model.

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