Cosmic Amorphous Dust Model as the Origin of Anomalous Microwave Emission

Masashi Nashimoto, Makoto Hattori, Frédérick Poidevin, Ricardo Génova-Santos

研究成果: Article査読

4 被引用数 (Scopus)

抄録

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 3σ 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 grains. Therefore, we coin our dust model as the cosmic amorphous dust model.

本文言語English
論文番号L40
ジャーナルAstrophysical Journal Letters
900
2
DOI
出版ステータスPublished - 2020 9月 10

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学

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