Polarized far-infrared and submillimeter emission from interstellar dust

Bruce T. Draine, Aurélien A. Fraisse

Research output: Contribution to journalArticle

84 Scopus citations

Abstract

Polarized far-infrared (FIR) and submillimeter emission is calculated for models of nonspherical dust grains that are constrained to reproduce the observed wavelength-dependent extinction and polarization of starlight. For emission from regions where the magnetic field is perpendicular to the line of sight, the FIR emission is expected to have substantial linear polarization at wavelengths ̃ ≳ 100 μm, 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 λ > 100 μm, but for some models in which only silicate grains are spheroidal, the linear polarization increases from, about 3% at 100 μm to about 15% at 1 mm. We briefly discuss the implications of these results for the removal of the polarized dust emission from maps of the cosmic microwave background, as well as the possibility of discriminating among interstellar dust models based on observations of FIR and submillimeter linear polarization.

Original languageEnglish (US)
Pages (from-to)1-11
Number of pages11
JournalAstrophysical Journal
Volume696
Issue number1
DOIs
StatePublished - Jan 1 2009

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Dust
  • Extinction - Infrared
  • Ism - Radiation mechanisms
  • Thermal

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