论文标题
深尘II：扩散ISM一般领域的特性
Dark dust II: Properties in the general field of the diffuse ISM
论文作者
论文摘要
通过考虑大晶粒灭绝，从光谱或视差得出的距离估计已统一。在当代的一组观测约束中，测试了这种所谓的暗尘的添加到弥漫性星际介质模型中的添加。暗尘模型通过尊重代表性的固相元素丰度来解释典型的波长依赖性依赖性的红色，消光，并通过远紫外线和毫米波长之间的星际灰尘颗粒对偏振光和非极化光的发射。暗尘的物理特性得出了。深尘由微米大小的颗粒组成，这些颗粒最近被检测到原位。它提供了从远紫外线到近红外的显着无独立的红色红色。在8-12k的灰尘温度下，通过谷物重新将深灰吸收的光重新喷射。在外部星系中经常观察到这种非常冷的灰尘。深尘会导致极化大于约1 mm至〜35％，并且在较短的波长方面略有差异。研究了用于硅酸盐粉尘类似的光学常数。通过混合3％的毫克$ _ {0.8} $ fe $^{2+} _ {0.2} $ sio $ _3 $ to mgo $ - $ 0.5 SIO $ _2 $ _2 $得出的数据得出的数据仍然可以容纳多达5-10％的黑尘中的5-10％。在讨论SN〜IA光曲线和其他研究中，深尘的额外昏迷是无法探索的。以前忽略深色尘埃的模型不能解释距离尺度的统一。
Distance estimates derived from spectroscopy or parallax have been unified by considering extinction by large grains. The addition of such a population of what is called Dark Dust to models of the diffuse interstellar medium is tested against a contemporary set of observational constraints. The dark dust model explains, by respecting representative solid-phase element abundances, simultaneously the typical wavelength-dependent reddening, extinction, and emission of polarized and unpolarized light by interstellar dust particles between far UV and millimetre wavelengths. The physical properties of dark dust are derived. Dark dust consists of micrometre-sized particles, which have been recently detected in-situ. It provides significant wavelength-independent reddening from the far UV to the near-infrared. Light absorbed by dark dust is re-emitted in the submillimeter region by grains at dust temperatures of 8-12K. Such very cold dust has been frequently observed in external galaxies. Dark dust contributes to the polarisation at greater than about 1 mm to ~35% and at shorter wavelengths marginally. Optical constants for silicate dust analogous are investigated. By mixing 3% in mass of Mg$_{0.8}$Fe$^{2+}_{0.2}$ SiO$_3$ to MgO$-$0.5 SiO$_2$ a good fit to the data is derived that still can accommodate up to 5 - 10% of mass in dark dust. The extra diming of light by dark dust is unexplored when discussing SN~Ia light curves and in other research. Previous models that ignore dark dust do not account for the unification of the distance scales.
