A refined model for spinning dust radiation

Creators: Ali-Haïmoud, Yacine; Hirata, Christopher M.; Dickinson, Clive

Abstract

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.

Additional Information

© 2009 The Authors. Journal compilation © 2009 RAS. Accepted 2009 February 4. Received 2009 February 4; in original form 2008 December 26. Published Online: 30 March 2009. We thank G. Dobler, B. Draine, D. Finkbeiner and A. Lazarian for numerous conversations about the physics of grain rotation. YA-H. also thanks T. Readhead and T. Pearson for useful discussions. YA-H. and CMH are supported by the US Department of Energy (DE-FG03-92-ER40701) and the National Science Foundation (AST-0807337). The early phase of this project was funded by the NSF grant AST-0607857. CH is supported by the Alfred P. Sloan Foundation. CD acknowledges support from the US Planck project, which is funded by the NASA Science Mission Directorate.

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