论文标题
Cygnus Allscale化学和动力环境调查：级联：Max Planck IRAM天文台计划（MIOP）对DR20的概述和首先结果
The Cygnus Allscale Survey of Chemistry and Dynamical Environments: CASCADE: Overview and first results toward DR20 from the Max Planck IRAM Observatory program (MIOP)
论文作者
论文摘要
上下文：在过去几十年中，对大分子云量表以及小核和磁盘量表上的恒星形成进行了深入研究，但大规模的星际材料与最密集的小规模核心的连接已在很大程度上被忽略了。 方法：使用NOEMA和IRAM 30 \，M望远镜，我们绘制了绘制的较大面积（640 \，Arcmin $^2 $）的原型恒星形成Cygnus X的cygnus x在3.6 \，线路和连续性发射中的毫米波长。 结果：介绍了Cygnus Allscale化学和动力环境（级联）的范围和轮廓。然后，我们专注于Cygnus X中第一个观察到的子区域，即DR20星形地层位点，该位点包括从冷原始气体团到更具进化的超消极H {\ sc ii}区域的一系列进化阶段。覆盖云到岩心的数据以$ <5000 $ \的线性空间分辨率，AU显示出几个运动学云组件，可能是几个大规模流到中心芯上的几个运动云组件。通过HCN/HNC强度比研究了该区域的温度结构，并与粉尘衍生的温度进行了比较。我们发现，申请的DCO $^+$排放几乎完全位于低温低于20 \ k的低温下。 Investigating the slopes of spatial power spectra of dense gas tracer intensity distributions (HCO$^+$, H$^{13}$CO$^+$, and N$_2$H$^+$), we find comparatively flat slopes between $-2.9$ and $-2.6$, consistent with high Mach numbers and/or active star formation in DR20.
Context: While star formation on large molecular cloud scales and on small core and disk scales has been investigated intensely over the past decades, the connection of the large-scale interstellar material with the densest small-scale cores has been a largely neglected field. Methods: Using NOEMA and the IRAM 30\,m telescope, we mapped large areas (640\,arcmin$^2$) of the archetypical star formation complex Cygnus X at 3.6\,mm wavelengths in line and continuum emission. Results: The scope and outline of The Cygnus Allscale Survey of Chemistry and Dynamical Environments (CASCADE) is presented. We then focus on the first observed subregion in Cygnus X, namely the DR20 star formation site, which comprises sources in a range of evolutionary stages from cold pristine gas clumps to more evolved ultracompact H{\sc ii} regions. The data covering cloud to cores scales at a linear spatial resolution of $<5000$\,au reveal several kinematic cloud components that are likely part of several large-scale flows onto the central cores. The temperature structure of the region is investigated by means of the HCN/HNC intensity ratio and compared to dust-derived temperatures. We find that the deuterated DCO$^+$ emission is almost exclusively located toward regions at low temperatures below 20\,K. Investigating the slopes of spatial power spectra of dense gas tracer intensity distributions (HCO$^+$, H$^{13}$CO$^+$, and N$_2$H$^+$), we find comparatively flat slopes between $-2.9$ and $-2.6$, consistent with high Mach numbers and/or active star formation in DR20.
