Far-infrared to millimeter astrophysical dust emission. I. A model based on physical properties of a
Far-infrared to millimeter astrophysical dust emission. I. A model based on physical properties of a
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DOI：
10.1051/0004-6361:20065771
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发表时间：
2007-01
影响因子：
6.5
通讯作者：
C. Meny;V. Gromov;N. Boudet;J. Bernard;D. Paradis;C. Nayral
中科院分区：
文献类型：
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作者：
C. Meny;V. Gromov;N. Boudet;J. Bernard;D. Paradis;C. Nayral
目标。我们提出了一个新的描述天文尘埃辐射的光谱区域从远红外到毫米波长。方法.与以前的经典模型不同，这种描述明确地纳入了无定形尘埃颗粒的无序内部结构的影响。我们的模型是基于固态物理用于解释实验室数据的结果。该模型考虑了无序电荷分布对吸收的影响，以及局域二能级系统对吸收的影响。结果我们审查的各种自由参数的模型从理论和实验室的实验数据的约束。我们表明，对于现实的自由参数值，发射光谱的形状将表现出非常广泛的结构，其形状将以非平凡的方式与尘埃颗粒的温度变化。光谱形状还取决于描述晶粒内部结构的参数。这为从观测到的FIR/mm发射光谱的形状中识别天文尘埃的性质开辟了新的视角。一个配套文件将提供一个明确的比较模型与天文数据。
Aims. We propose a new description of astronomical dust emission in the spectral region from the far-infrared to millimeter wavelengths. Methods. Unlike previous classical models, this description explicitly incorporates the effect of the disordered internal structure of amorphous dust grains. Our model is based on results from solid state physics used to interpret laboratory data. The model takes into account the effect of absorption by disordered charge distribution, as well as the effect of absorption by localized two level systems. Results. We review constraints on the various free parameters of the model from theory and laboratory experimental data. We show that, for realistic values of the free parameters, the shape of the emission spectrum will exhibit very broad structures whose shape will change in a non trivial way with the temperature of dust grains. The spectral shape also depends upon the parameters describing the internal structure of the grains. This opens new perspectives for identifying the nature of astronomical dust from the observed shape of the FIR/mm emission spectrum. A companion paper will provide an explicit comparison of the model with astronomical data.