论文标题
银河系以银色灰尘的三维分布
Three-Dimensional Distribution of the Interstellar Dust in the Milky Way
论文作者
论文摘要
我们提供了南部天空的三维（3D）灭绝地图。该地图涵盖了$ \ sim $ 14,000 $ {\ rm deg^{2}} $的Skymapper Southern Survey（SMSS）区域，并具有6.9至27 Arcmin之间的空间分辨率。基于SMS的多波段光度法，两个微米的所有天空调查，宽场红外调查Explorer调查和Gaia Mission，我们估计了$ r $ band灭绝的$ \ sim $ \ sim $ \ sim $ \ sim $ \ sim $ \ sim $ \ sim $ \ sim $ \ sim $ \ sim $ \ sim，具有光谱能量分布（SED）分析。加上从Gaia Data Release 2（DR2）视差计算出的距离，我们构建了南部天空的三维灭绝图。通过将我们的3D灭绝图与文献的灭绝图相结合，我们提出了一个全套的3D灭绝图，并使用它来探索银河粉尘晶粒的3D分布。我们使用两个不同的型号，一个组成一个磁盘和两个磁盘中的另一个，以适合银河粉尘晶粒的3D分布。两盘模型可以更好地拟合数据，从而产生较小的贝叶斯信息标准（BIC）值。最佳拟合模型的比例高度分别为73和225 PC，分别用于“薄”和“厚”的灰尘磁盘。
We present a three-dimensional (3D) extinction map of the southern sky. The map covers the SkyMapper Southern Survey (SMSS) area of $\sim$ 14,000 ${\rm deg^{2}}$ and has spatial resolutions between 6.9 and 27 arcmin. Based on the multi-band photometry of SMSS, the Two Micron All Sky Survey, the Wide-Field Infrared Survey Explorer Survey and the Gaia mission, we have estimated values of the $r$-band extinction for $\sim$ 19 million stars with the spectral energy distribution (SED) analysis. Together with the distances calculated from the Gaia data release 2 (DR2) parallaxes, we have constructed a three-dimensional extinction map of the southern sky. By combining our 3D extinction map with those from the literature, we present an all-sky 3D extinction map, and use it to explore the 3D distribution of the Galactic dust grains. We use two different models, one consisting a single disk and another of two disks, to fit the 3D distribution of the Galactic dust grains. The data is better fitted by a two-disk model, yielding smaller values of the Bayesian Information Criterion (BIC). The best fit model has scale heights of 73 and 225 pc for the "thin" and "thick" dust disks, respectively.
