论文标题
关于Ch $ _3 $ OD丰度与温度之间的关系
On the Relationship between CH$_3$OD Abundance and Temperature in the Orion KL Nebula
论文作者
论文摘要
在星形的区域中，单人置甲醇同位素学的相对丰度，[ch $ _ {2} $ doh]/[Ch $ _ {3} $ od]，在统计上预期的比例偏离了3个统计期望的比例。通过理论近三十年。我们使用Atacama大型毫米/亚毫米阵列对Orion KL进行了高角度分辨率观测，以绘制整个星云上的Ch $ _ {3} $ OD柱密度的小规模变化，这为恒星和行星形成期间提供了新的途径来检查氘化学。通过考虑Ch $ _ {3} $ OD色谱柱密度如何随温度而变化，我们发现化学过程的证据可以显着改变观察到的色谱柱密度。将天文数据与现有的理论工作和支持D-H交换之间的现有的D-H交换，并在冰晶粒冰冷的地幔中的甲醇羟基地点，在甲醇的羟基地点（即HDO和D $ _ {2} $ O）。增强的Ch $ _ {3} $ OD柱密度位于热核-SW区域，这种模式可能与冰壁炉化学的耦合演化相关，并在巨型分子云中恒星形成。这项工作为Orion KL中的氘化甲醇化学提供了新的观点，并告知您可能指导未来理论，实验和观察工作的考虑因素。
The relative abundances of singly-deuterated methanol isotopologues, [CH$_{2}$DOH]/[CH$_{3}$OD], in star-forming regions deviate from the statistically expected ratio of 3. In Orion KL, the nearest high-mass star-forming region to Earth, the singly-deuterated methanol ratio is about 1, and the cause for this observation has been explored through theory for nearly three decades. We present high-angular resolution observations of Orion KL using the Atacama Large Millimeter/submillimeter Array to map small-scale changes in CH$_{3}$OD column density across the nebula, which provide a new avenue to examine the deuterium chemistry during star and planet formation. By considering how CH$_{3}$OD column densities vary with temperature, we find evidence of chemical processes that can significantly alter the observed column densities. The astronomical data are compared with existing theoretical work and support D-H exchange between CH$_{3}$OH and heavy water (i.e., HDO and D$_{2}$O) at methanol's hydroxyl site in the icy mantles of dust grains. The enhanced CH$_{3}$OD column densities are localized to the Hot Core-SW region, a pattern that may be linked to the coupled evolution of ice mantel chemistry and star formation in giant molecular clouds. This work provides new perspectives on deuterated methanol chemistry in Orion KL and informs considerations that may guide future theoretical, experimental, and observational work.
