论文标题
阿兹台克人对中央分子区域的调查：尘埃的频谱增加密度的频谱指数
AzTEC Survey of the Central Molecular Zone: Increasing Spectral Index of Dust with Density
论文作者
论文摘要
我们银河系的中央分子区（CMZ）具有类似于遥远宇宙中典型的Starburst星系中的极端环境。为了了解CMZ等环境中的灰尘特性，我们通过对AZTEC/大型毫米望远镜调查的联合分析以及现有\ textit {Herschel} Far-far-far-far-far-far-far-far-far-the the CMZ的数据提供了结果。我们将全球前景和背景贡献包括在新型的贝叶斯建模中，该模型结合了不同地图的点传播功能（PSF），从而使我们的高分辨率（$ 10.5''$）地图以1.1 $ mm $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ MAP，并揭示了有关CMZ尘土飞扬气体空间分布的前所未有的详细信息。有一个显着的趋势是将尘埃指数$β$从$ 2.0-2.4 $增加到CMZ的致密峰，表明大谷物不足或灰尘光学特性的根本变化。 $β$的这种环境依赖性可能会对其他研究的尘埃温度的确定产生重大影响。根据粉尘的光学特性如何偏离常规模型，灰尘温度可能会低估$ 10-50 \％\％$ $ $ $。
The Central Molecular Zone (CMZ) of our Galaxy hosts an extreme environment analogous to that found in typical starburst galaxies in the distant universe. In order to understand dust properties in environments like our CMZ, we present results from a joint SED analysis of our AzTEC/Large Millimeter Telescope survey, together with existing \textit{Herschel} far-IR data on the CMZ, from a wavelength range of $160$ $μm$ to $1.1$ $mm$. We include global foreground and background contributions in a novel Bayesian modeling that incorporates the Point Spread Functions (PSFs) of the different maps, which enables the full utilization of our high resolution ($10.5''$) map at 1.1 $mm$ and reveals unprecedentedly detailed information on the spatial distribution of dusty gas across the CMZ. There is a remarkable trend of increasing dust spectral index $β$, from $2.0-2.4$, toward dense peaks in the CMZ, indicating a deficiency of large grains or a fundamental change in dust optical properties. This environmental dependence of $β$ could have a significant impact on the determination of dust temperature in other studies. Depending on how the optical properties of dust deviate from the conventional model, dust temperatures could be underestimated by $10-50\%$ in particularly dense regions.
