CH $_3$ NH $_2$的观测及其形成过程
Survey Observation of CH$_3$NH$_2$ and Its Formation Process
摘要：
我们使用ALMA呈现了甘氨酸前体甲胺（CH $_3$ NH $_2$）以及甲醇（CH $_3$ OH）和甲亚胺（CH $_2$ NH）对高质量恒星形成区NGC 6334 I、G10.47+0.03、G31.41+0.3和W51~e1/e2的观测结果。这些来源的分子丰度使用旋转图方法推导，并与我们的国家的最先进的化学模型进行比较。我们发现观察到的“CH $_3$ NH $_2$ /CH $_3$ OH”的比率在0.11和2.2之间。我们还发现，观察到的“CH $_3$ NH $_2$ /CH $_3$ OH”的比例符合我们的化学模型，通过考虑的CH $_3$ NH $_2$的颗粒表面上通过氢化过程形成HCN。该结果清楚地表明氢化过程形成CH $_3$ NH $_2$的重要性。NGC 63343 I MM 3（其中在本研究中未检测到CH $_3$ NH $_2$，并且显示“CH $_3$ NH $_2$ /CH $_3$ OH”比小于0.02）与其他核心明显不同。
英文摘要：
We present the observational result of a glycine precursor, methylamine (CH$_3$NH$_2$), together with methanol (CH$_3$OH) and methanimine (CH$_2$NH) towards high-mass star-forming regions, NGC6334I, G10.47+0.03, G31.41+0.3, and W51~e1/e2 using ALMA. The molecular abundances toward these sources were derived using the rotational diagram method and compared with our state-of-the-art chemical model. We found that the observed ratio of "CH$_3$NH$_2$/CH$_3$OH" is in between 0.11 and 2.2. We also found that the observed "CH$_3$NH$_2$/CH$_3$OH" ratio agrees well with our chemical model by considering the formation of CH$_3$NH$_2$ on the grain surface via hydrogenation process to HCN. This result clearly shows the importance of hydrogenation processes to form CH$_3$NH$_2$. NGC63343I MM3, where CH$_3$NH$_2$ was not detected in this study and showed "CH$_3$NH$_2$/CH$_3$OH" ratio of less than 0.02, is clearly distinguished from the other cores.
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