Journal Article

Spinning dust emission: the effect of rotation around a non-principal axis

Kedron Silsbee, Yacine Ali-Haïmoud and Christopher M. Hirata

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 411, issue 4, pages 2750-2769
Published in print March 2011 | ISSN: 0035-8711
Published online March 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.17882.x
Spinning dust emission: the effect of rotation around a non-principal axis

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We investigate the rotational emission from dust grains that rotate around non-principal axes. We argue that in many phases of the interstellar medium, the smallest grains, which dominate spinning dust emission, are likely to have their nutation state (orientation of principal axes relative to the angular momentum vector) randomized during each thermal spike. We recompute the excitation and damping rates associated with rotational emission from the grain permanent dipole, grain–plasma interactions, infrared photon emission and collisions. The resulting spinning dust spectra generally show a shift towards higher emissivities and peak frequencies relative to previous calculations.

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

Journal Article.  12644 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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