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

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

2010-03-24

arxiv.org/abs/1003.4732v2

MNRAS 411, 2750 (2011)

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Version accepted for publication in MNRAS. The derivation of the emission spectrum was clarified. The companion code, SPDUST.2

Scientific paper

10.1111/j.1365-2966.2010.17882.x

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 gener- ally show a shift toward higher emissivities and peak frequencies relative to previous calculations.

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