量化中心分子带各向异性密度结构--二维关联函数方法
Quantifying the anisotropic density structure of the Central Molecular Zone -- a 2D correlation function approach
摘要：
中央分子带（CMZ）是位于银河系中心的环状结构。利用APEX望远镜大面积巡天星系（ATLASGAL）870 $μ$ m连续谱图，利用二维关联函数研究了中央分子带（CMZ）气体密度结构的各向异性.为了量化空间各向异性，我们定义了临界角$θ_{\rm half}$，以及各向异性参数$A\equiv \fracπ{4θ_{\rm half}}-1$。我们发现，在大尺度（~ 100 pc）下，密度结构是强各向异性的，空间各向异性程度随尺度的减小而减小。在~ 10 pc的尺度下，结构仍然是轻度各向异性的。在我们的分析中，我们提供了一个定量描述的各向异性密度结构的气体在CMZ，和形式主义可以应用到不同的区域，以研究它们的差异。
英文摘要：
The Central Molecular Zone (CMZ) is a ring-like structure sitting at the center of the Milky Way. Using the 870 $μ$m continuum map from the APEX Telescope Large Area Survey of the Galaxy (ATLASGAL), we study the anisotropy of the density structure of the gas in the Central Molecular Zone (CMZ) using the 2D correlation function. To quantify the spatial anisotropy, we define the critical angle $θ_{\rm half}$, as well as the anisotropy parameter $A\equiv \fracπ{4θ_{\rm half}}-1$. We find that the density structure is strongly anisotropic at the large scale (~ 100 pc), and the degree of spatial anisotropy decreases with the decreasing scale. At the scale of ~ 10 pc, the structure is still mildly anisotropic. In our analyses, we provide a quantitative description of the anisotropic density structure of gas in the CMZ, and the formalism can be applied to different regions to study their differences.
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