EAS Publications Series
Volume 4, 2002Infrared and Submillimeter Space Astronomy: An International Colloquium to Honor the Memory of Guy Serra
|Page(s)||37 - 37|
|Section||Session I: Dust and Gas Properties|
|Published online||25 September 2002|
M. Giard, J.P. Bernard, A. Klotz and I. Ristorcelli (eds)
EAS Publications Series, 4 (2002) 37
Temperature-dependent FIR/sub-mm dust emissivity indices: some implications for the diffuse ISM dust composition
Institut d'Astrophysique Spatiale (CNRS), Université Paris XI,
We have studied the effects of the laboratory-measured, temperature-dependent dust emissivity indices on the FIR/sub-mm emission properties of amorphous silicate and amorphous carbonaceous dust. When the experimentally-determined temperature dependence of the dust emissivity index is taken into account we find temperatures that can differ by as much as 1.5 K and emissivity indices that can differ by ~15%, with respect to the values obtained using published refractive index data as is to calculate these quantities. In addition, we find that the observed diffuse ISM dust temperature of ~17.5 K and emissivity index of 2 can seemingly be produced with a mixture of amorphous carbon and silicate grains only if temperature-dependent dust emissivity indices are adopted. We find that dust masses determined using the temperature-dependent dust emissivity indices are not significantly different from those derived using standard dust properties.
© EAS, EDP Sciences, 2002
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