Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21348002f&link_type=abstract
American Astronomical Society, AAS Meeting #213, #480.02; Bulletin of the American Astronomical Society, Vol. 41, p.447
Astronomy and Astrophysics
Astronomy
Scientific paper
We present calculations of the polarized far-infrared and submillimeter emission from interstellar dust for models of nonspherical grains that are constrained to reproduce the observed wavelength-dependent extinction and polarization of starlight. We show that the far-infrared emission from regions where the magnetic field is perpendicular to the line-of-sight has substantial linear polarization at wavelengths longer than 100 microns, but the degree of linear polarization, and its variation with wavelength, is model-dependent. Models in which the starlight polarization is produced by both amorphous silicate and graphite grains have linear polarizations between 6% and 10% at wavelengths longer than 100 microns, but for some models in which only silicate grains are spheroidal, the linear polarization increases from about 3% at 100 microns to about 15% at 1 mm. Extracting the polarized components of the Cosmic Microwave Background (CMB) from polarization maps at far-infrared and submillimeter wavelengths requires a precise understanding of this emission. We discuss the implications of our results in this context, and the possibility of discriminating among dust models based on these observations.
Draine Bruce T.
Fraisse Aurélien A.
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