猎户座的复杂性：一个ALMA视图。II。gGg“-乙二醇和乙酸
The complexity of Orion: an ALMA view. II. gGg'-Ethylene Glycol and Acetic Acid
摘要：
我们报告了对猎户座Kleinmann-Low星云的乙酸（CH $_3$ COOH）和gGg $^{\prime}$ -乙二醇（gGg $^{\prime}$（CH $_2$ OH）$_2$）的首次探测和高角分辨率（1.8”$\times$ 1.1”）成像。在第2次循环期间，使用ALMA在$\sim$ 1.3 mm处进行观察。一个值得注意的结果是，乙酸和乙二醇发射的空间分布不同于Orion-KL内的其他O-轴承分子。实际上，虽然含氧物质的典型发射具有与连接热芯区域和致密脊的“V形”（向BN物体延伸）相关的形态，但乙酸和乙二醇的发射主要在距热芯区域西南约2”处（靠近源I和n）达到峰值。我们发现测量的CH $_3$ COOH：aGg $^{\prime}$（CH $_2$ OH）$_2$和CH $_3$ COOH：gGg $^{\prime}$（CH $_2$ OH）$_2$的比值与对低质量原恒星IRAS 16293- 2422测量的比值相差一个数量级以上。我们对这些发现的最佳解释是CH $_3$ COOH、aGg $^{\prime}$（CH $_2$ OH）$_2$和gGg $^{\prime}$（CH $_2$ OH）$_2$是在颗粒的冰冷表面形成的，然后通过与水的共解吸而释放到气相中，这是由于大约500-700年前在星云中心发生的爆炸事件中喷射出的一颗物质。
英文摘要：
We report the first detection and high angular resolution (1.8" $\times$ 1.1") imaging of acetic acid (CH$_3$COOH) and gGg$^{\prime}$--ethylene glycol (gGg$^{\prime}$(CH$_2$OH)$_2$) towards the Orion Kleinmann--Low nebula. The observations were carried out at $\sim$1.3mm with ALMA during the Cycle~2. A notable result is that the spatial distribution of the acetic acid and ethylene glycol emission differs from that of the other O-bearing molecules within Orion-KL. Indeed, while the typical emission of O-bearing species harbors a morphology associated with a "V-shape" linking the Hot Core region to the Compact Ridge (with an extension towards the BN object), that of acetic acid and ethylene glycol mainly peaks at about 2" southwest from the hot core region (near sources I and n). We find that the measured CH$_3$COOH:aGg$^{\prime}$(CH$_2$OH)$_2$ and CH$_3$COOH:gGg$^{\prime}$(CH$_2$OH)$_2$ ratios differ from the ones measured towards the low-mass protostar IRAS 16293--2422 by more than one order of magnitude. Our best hypothesis to explain these findings is that CH$_3$COOH, aGg$^{\prime}$(CH$_2$OH)$_2$ and gGg$^{\prime}$(CH$_2$OH)$_2$ are formed on the icy-surface of grains and then released into the gas-phase, via co-desorption with water, due to a bullet of matter ejected during the explosive event that occurred in the heart of the Nebula about 500-700 years ago.
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