论文标题
Astrodust+PAH模型：弥散星际介质中灰尘的灭绝，发射和极化的统一描述
The Astrodust+PAH Model: A Unified Description of the Extinction, Emission, and Polarization from Dust in the Diffuse Interstellar Medium
论文作者
论文摘要
我们提出了一个新的星际灰尘模型，其中大晶粒是单个复合材料``satrodust''和纳米粒子大小的晶粒，其中包括多环芳族烃（PAHS）。我们认为，大于$ \ sim $ 0.02 $ 0. $ m的谷物的单分解模型最自然地解释了远红外（FIR）极化分数中缺乏频率依赖性以及光学偏振的特征比率。我们得出1.4：1的尺寸分布和比对函数，将天星晶粒散布在pahs的情况下，重现了银河系灭绝的平均波长依赖性和偏振，并从弥漫性星际介质中产生了差异，同时尊重固相中的约束。所有模型数据和基于Python的界面均可公开使用。
We present a new model of interstellar dust in which large grains are a single composite material, ``astrodust,'' and nanoparticle-sized grains come in distinct varieties including polycyclic aromatic hydrocarbons (PAHs). We argue that a single-composition model for grains larger than $\sim$0.02 $μ$m most naturally explains the lack of frequency dependence in the far-infrared (FIR) polarization fraction and the characteristic ratio of optical to FIR polarization. We derive a size distribution and alignment function for 1.4:1 oblate astrodust grains that, with PAHs, reproduce the mean wavelength dependence and polarization of Galactic extinction and emission from the diffuse interstellar medium while respecting constraints on solid phase abundances. All model data and Python-based interfaces are made publicly available.
