We have shown that the thermal emission of the amorphous dust composed of amorphous silicate dust (a-Si) and amorphous carbon dust (a-C) provides an excellent fit both to the observed intensity and the polarization spectra of molecular clouds. The anomalous microwave emission (AME) originates from the resonance transition of the two-level systems attributed to the a-C with an almost spherical shape. On the other hand, the observed polarized emission in submillimeter wave bands is coming from a-Si. By taking into account a-C, the model prediction of the polarization fraction of the AME is reduced dramatically. Our model prediction of the 3 σ lower limits of the polarization fraction of the Perseus and W 43 molecular clouds at 17 GHz are 8.129 × 10 −5 and 8.012 × 10 −6 , respectively. The temperature dependence of the heat capacity of a-C shows the peculiar behavior compared with that of a-Si. So far, the properties of a-C are unique to interstellar dust g...

中文翻译：

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宇宙无定形尘埃模型是微波异常发射的起源

我们已经表明，由无定形硅酸盐粉尘（a-Si）和无定形碳粉尘（aC）组成的无定形尘埃的热发射与观察到的强度和分子云的偏振光谱都具有极好的匹配性。异常微波发射（AME）起源于两级系统的共振跃迁，这归因于aC几乎呈球形。另一方面，在亚毫米波段观察到的极化发射来自a-Si。通过考虑aC，可以大大降低AME极化率的模型预测。我们对17 GHz处的Perseus和W 43分子云的偏振分数的3σ下限的模型预测分别为8.129×10 -5和8.012×10 -6。与非晶硅相比，非晶碳热容量的温度依赖性表现出其独特的行为。到目前为止，aC的特性是星际尘埃所特有的。