Silsbee, Kedron and Ali-Haïmoud, Yacine and Hirata, Christopher M. (2011) Spinning dust emission: the effect of rotation around a non-principal axis. Monthly Notices of the Royal Astronomical Society, 411 (4). pp. 2750-2769. ISSN 0035-8711 http://resolver.caltech.edu/CaltechAUTHORS:20110324-100337680
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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.
|Additional Information:||© 2010 The Authors. Monthly Notices of the Royal Astronomical Society © 2010 RAS. Accepted 2010 October 15. Received 2010 August 15; in original form 2010 March 29. Article first published online: 9 Dec. 2010. We thank Bruce Draine and Nathalie Ysard for numerous conversations about the physics of grain rotation, and Clive Dickinson for reading the manuscript and testing SPDUST v2.0. KS would like to thank Edward C. and Alice Stone for their support for the Summer Undergraduate Research Fellowship programme at Caltech. YA-H and CH are supported by the US Department of Energy (DE-FG03-92-ER40701) and the National Science Foundation (AST-0807337). CH is supported by the Alfred P. Sloan Foundation.|
|Subject Keywords:||radiation mechanisms: non-thermal – dust, extinction – radio continuum: ISM.|
|Official Citation:||Silsbee, K., Ali-Haïmoud, Y. and Hirata, C. M. (2011), Spinning dust emission: the effect of rotation around a non-principal axis. Monthly Notices of the Royal Astronomical Society, 411: 2750–2769. doi: 10.1111/j.1365-2966.2010.17882.x|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Benjamin Perez|
|Deposited On:||24 Mar 2011 19:37|
|Last Modified:||17 Sep 2012 19:23|
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