论文标题
银河巨大的恒星形成区域中的犹太氨
Deuterated ammonia in Galactic massive star-forming regions
论文作者
论文摘要
我们向110.153599 GHz对NH2D进行了敏感观察结果，该观察结果是用IRAM 30-m望远镜的50个银河巨大的星形形成区域。检测到NH2D转变向36个对象，得出的检测率为72％。通过假设具有固定激发温度的局部热平衡条件来得出每个来源的NH2D，HC3N和C18O的列密度。 NH $ _3 $的氘比，定义为NH2D与NH3的丰度比，也可以通过文献中的NH3信息获得19个来源。在这项工作的后期形成区域，氘分馏的范围弯曲为较大，值从0.043至0.0006。在G081.75+00.78（DR21）中，NH3的最高氘比为0.043。我们还发现，NH3的氘比随着半乳酸的距离而增加，并且随线宽度而减小。
We present sensitive observations of NH2D at 110.153599 GHz toward 50 Galactic massive star-forming regions with IRAM 30-m telescope. The NH2D transition is detected toward 36 objects, yielding a detection rate of 72%. Column densities of NH2D, HC3N and C18O for each source are derived by assuming local thermal equilibrium conditions with a fixed excitation temperature. The deuterium ratio of NH$_3$, defined as the abundance ratio of NH2D to NH3, for 19 sources is also obtained with the information of NH3 from the literature. The range of deuterium fractionation bends to be large in the late-stage star-forming regions in this work, with the value from 0.043 to 0.0006. The highest deuterium ratio of NH3 is 0.043 in G081.75+00.78 (DR21). We also find that the deuterium ratio of NH3 increases with the Galactocentric distances and decreases with the line width.
