Dipolar radiation from spinning dust grains coupled to an electromagnetic wave

• Type: Article in International Scientific Journal
• Date: 2007

Authors

Guerreiro, A (Author) FCUP; ELoy, M (Author) Other; Mendonca, JT (Author) Other; Bingham, R (Author) Other

Journal

Title: Journal of Plasma Physics

Vol. 73

Pages: 555-563

ISSN: 0022-3778

Publisher: Cambridge University Press

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 0 Citations

Scientific classification

FOS: Natural sciences > Physical sciences

Other information

Authenticus ID: P-004-8JN

DOI: 10.1017/s0022377806006076

Abstract (EN): 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 w(0) as well as quivering motion at a frequency Omega(0), 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 w(0), and sidebands at w(0) +/- Omega(0) and w(0) +/- 2 Omega(0). 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 mu m thermal emission from interstellar dust that has been recently measured.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9