Orion-KL的化学结构解析
Resolving the chemical substructure of Orion-KL
摘要：
猎户座的Kleinmann-Low星云（猎户座-KL）是最接近高质量恒星形成环境的例子。我们第一次补充了1.3毫米亚毫米阵列（SMA）干涉线测量与IRAM 30米单碟观测的猎户座KL地区。该调查共覆盖4 GHz带宽，包含来自20个物种（25种同位素）的160多条发射线，其中包括11种复杂的有机分子（COM）。在1200 AU的空间分辨率下，连续体子结构被解析。从各个子结构中提取光谱，并提供每个物种的强度积分分布图，我们研究了该地区的小尺度化学变化。我们的主要结果是：（1）我们鉴定了来自低丰度COMs CH 3COCH 3和CH 3CH 2 OH的线，并初步检测了CH 3CHO和长碳链C6 H和HC 7 N。(2)我们发现，虽然大多数COM是按类型隔离的，峰值要么朝向热核心（例如，含N物种）或紧密脊（例如，含氧物种，如HCOOCH 3和CH 3 OCH 3），而其他物种的分布则不遵循这种分离结构（例如，CH3CH2OH、CH3OH、CH3COCH 3）。(3)我们发现HNCO，SO2，34 SO2和SO线的第二速度分量，这可能与一个强的冲击事件在低速流出。(4)温度和分子丰度显示大梯度之间的中央冷凝和流出区域，说明热分子核心和冲击化学为主的制度之间的过渡。我们对Orion-KL空间分辨化学变化的观察为热分子核心和流出化学提供了最近的参考来源，这将是解释更遥远的HMSFR化学的重要例子。
英文摘要：
The Kleinmann-Low nebula in Orion (Orion-KL) is the nearest example of a high-mass star-forming environment. For the first time, we complemented 1.3 mm Submillimeter Array (SMA) interferometric line survey with IRAM 30 m single-dish observations of the Orion-KL region. Covering a 4 GHz bandwidth in total, this survey contains over 160 emission lines from 20 species (25 isotopologues), including 11 complex organic molecules (COMs). At a spatial resolution of 1200 AU, the continuum substructures are resolved. Extracting the spectra from individual substructures and providing the intensity-integrated distribution map for each species, we studied the small-scale chemical variations in this region. Our main results are: (1) We identify lines from the low-abundance COMs CH3COCH3 and CH3CH2OH, as well as tentatively detect CH3CHO and long carbon-chains C6H and HC7N. (2) We find that while most COMs are segregated by type, peaking either towards the hot core (e.g., N-bearing species) or the compact ridge (e.g., O-bearing species like HCOOCH3 and CH3OCH3), while the distributions of others do not follow this segregated structure (e.g., CH3CH2OH, CH3OH, CH3COCH3). (3) We find a second velocity component of HNCO, SO2, 34SO2, and SO lines, which may be associated with a strong shock event in the low-velocity outflow. (4) Temperatures and molecular abundances show large gradients between central condensations and the outflow regions, illustrating a transition between hot molecular core and shock-chemistry dominated regimes. Our observations of spatially resolved chemical variations in Orion-KL provide the nearest reference source for hot molecular core and outflow chemistry, which will be an important example for interpreting the chemistry of more distant HMSFRs.
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