论文标题
在太阳祖细胞类似物OMC-2 FIR4中，在600 AU量表上没有氮分馏
No nitrogen fractionation on 600 au scale in the Sun progenitor analogue OMC-2 FIR4
论文作者
论文摘要
我们显示了用Atacama大毫米阵列（ALMA）获得的14N/15N比的第一张干涉图，朝着太阳样形成的原始团体OMC-2 FIR4。我们观察到N2H+，15NNH+，N15NH+（1-0）和N2D+（2-1），从中我们得出同位素比14N/15N和D/H。目标是我们太阳可能形成的环境的最接近类似物之一。与〜600 au相对应的合成光束的ALMA图像表明，较不丰富的同位素学的发射分布在几个核心〜10英寸（即〜0.02〜PC或4000 au）中，嵌入了更延长的N2H+发射中。总体而言，我们的结果范围不超过。温度变化。我们的发现还表明，原始太阳系对象中发现的14N/15N变化可能不是从原始阶段遗传而来的，因此必须在其他地方找到它们的原因。
We show the first interferometric maps of the 14N/15N ratio obtained with the Atacama Large Millimeter Array (ALMA) towards the Solar-like forming protocluster OMC-2 FIR4. We observed N2H+, 15NNH+, N15NH+ (1-0), and N2D+ (2-1), from which we derive the isotopic ratios 14N/15N and D/H. The target is one of the closest analogues of the environment in which our Sun may have formed. The ALMA images, having synthesised beam corresponding to ~600 au, show that the emission of the less abundant isotopologues is distributed in several cores of ~10" (i.e. ~0.02~pc or 4000 au) embedded in a more extended N2H+ emission. Overall, our results indicate that: (1) 14N/15N does not change across the region at core scales, and (2) 14N/15N does not depend on temperature variations. Our findings also suggest that the 14N/15N variations found in pristine Solar System objects are likely not inherited from the protocluster stage, and hence their reason has to be found elsewhere.
