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Dipolar radiation from spinning dust grains coupled to an electromagnetic wave

Published online by Cambridge University Press:  01 August 2007

A. GUERREIRO ,
M. ELOY ,
J. T. MENDONÇA  and
R. BINGHAM
A. GUERREIRO
Affiliation:
Physics Department, Faculdade de Ciěncias daUniversidade do Porto, Rua do Campo Alegre, 687, 4169-007 Porto, Portugal
M. ELOY
Affiliation:
Faculdade de Engenharia daUniversidade Católica Portuguesa, Estrada Octávio Pato, 2635-631 Rio de Mouro, Portugal
J. T. MENDONÇA
Affiliation:
Instituto Superior Técnico, Av. Rovisco Pais, 1000 Lisboa, Portugal
R. BINGHAM
Affiliation:
Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire OX11 OQX, UK
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Abstract

In this paper we investigate how the complex rotation and quivering motion of an elongated polarized dust grain in the presence of a monochromatic electromagnetic (EM) wave can produce dipolar emission with two distinct spectral components. We present a model for the emission of radiation by elongated polarized dust grains under the influence of both an external EM wave and a constant background magnetic field. The dust, exhibiting rotational motion at the external EM field frequency ω 0 as well as quivering motion at a frequency Ω0, proportional to the EM field amplitude, will radiate with frequencies that will depend on the external field wavelength and amplitude. The radiated spectra exhibits a frequency around ω0, and sidebands at ω0 ± ω0 and ω0± 2Ω0. Since the amplitude and the frequency of the background EM field are independent parameters, this model establishes a correlation between different spectral components of galactic dipolar emission, which may help to explain the correlation between a component of the Galactic microwave emission and the 100 μ m thermal emission from interstellar dust that has been recently measured.

Type
Papers
Information
Journal of Plasma Physics , Volume 73 , Issue 4 , August 2007 , pp. 555 - 563
Copyright
Copyright © Cambridge University Press 2006

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