耦合到电磁波的自旋尘埃粒子的偶极辐射
Dipolar radiation from spinning dust grains coupled to an electromagnetic wave
摘要：
在这封信中，我们调查如何复杂的旋转和旋转运动的细长的极化尘埃颗粒在存在的单色电磁波可以产生偶极发射与两个不同的光谱分量。我们提出了一个模型的辐射辐射下的外部电磁波和恒定的背景磁场的影响下，细长的极化尘埃颗粒。尘埃在外部电磁场频率w0下表现出旋转运动，以及在频率W0下表现出与电磁场振幅成比例的往复运动，将以取决于外部场波长和振幅的频率辐射。辐射谱的频率在w0附近，边带在w0 ± 2W0和w0 ± 2W0处。由于背景电磁场的振幅和频率是相互独立的参数，该模型建立了银河系偶极辐射的不同光谱分量之间的相关性，这可能有助于解释最近测量到的银河系微波辐射分量与星际尘埃100微米热辐射之间的相关性。
英文摘要：
In this letter we investigate how the complex rotation and quivering motion of an elongated polarized dust grain in the presence of a monochromatic electromagnetic wave can originate 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 electromagnetic wave and a constant background magnetic field. The dust, exhibiting rotational motion at the external electromagnetic field frequency w0 as well as quivering motion at frequency W0, proportional to the em field amplitude, will radiate with frequencies that will depend on the external field wavelength and amplitude. The radiated spectra exibits a frequency around w0, and sidebands at w0+-W0 and w0+-2W0. Since the amplitude and the frequency of the background electromagnetic 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 100micons thermal emission from interstellar dust, that has been recently measured.
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