论文标题
宇宙无定形灰尘模型作为异常微波发射的起源
Cosmic Amorphous Dust Model as the Origin of Anomalous Microwave Emission
论文作者
论文摘要
我们已经表明，由无定形硅酸盐灰尘（A-SI）和无定形碳灰尘（A-C）组成的无定形粉尘的热发射（A-C）都非常适合观察到的强度和分子云的极化光谱。异常的微波发射（AME）源自归因于具有几乎球形形状的A-C的两级系统（TLS）的共振转变。另一方面，亚毫米波段中观察到的极化发射来自A-SI。通过考虑A-C，AME的极化部分的模型预测将大大降低。我们对3 $σ$的模型预测分别为$ 8.129 \ times 10^{ - 5} $和$ 8.012 \ times 10^{ - 6} $的3 $σ$下限。与A-SI相比，A-C的热容量的温度依赖性显示出特殊的行为。到目前为止，A-C的特性是星际粉尘颗粒所独有的。因此，我们将灰尘模型归因于宇宙无定形灰尘模型（CAD）。
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 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 (TLS) attributed to the a-C with an almost spherical shape. On the other hand, the observed polarized emission in submillimeter wavebands 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 $8.129 \times 10^{-5}$ and $8.012 \times 10^{-6}$, 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 grains. Therefore, we coin our dust model as the cosmic amorphous dust model (CAD).
