Journal Article

A refined model for spinning dust radiation

Yacine Ali-Haïmoud, Christopher M. Hirata and Clive Dickinson

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 395, issue 2, pages 1055-1078
Published in print May 2009 | ISSN: 0035-8711
Published online April 2009 | e-ISSN: 1365-2966 | DOI:
A refined model for spinning dust radiation

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We present a comprehensive treatment of the spectrum of electric dipole emission from spinning dust grains, updating the commonly used model of Draine & Lazarian. Grain angular velocity distributions are computed using the Fokker–Planck equation; we revisit the drift and diffusion coefficients for the major torques on the grain, including collisions, grain-plasma interactions and infrared emission. We use updated grain optical properties and size distributions. The theoretical formalism is implemented in the companion code, spdust, which is publicly available. The effect of some environmental and grain parameters on the emissivity is shown and analysed.

Keywords: radiation mechanisms: non-thermal; dust, extinction; radio continuum: ISM

Journal Article.  14197 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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