Arp220的高分辨率HNC 3-2 SMA观测
High-resolution HNC 3-2 SMA observations of Arp220
摘要：
高分辨率（0。“4）使用亚毫米波阵列（SMA）对HNC J=3-2的观测。我们发现明亮的HNC 3-2线发射在西部的Arp 220，集中在西部的核心，而东部的合并显示相对微弱的发射。一个明亮的（36 K），窄（60公里/秒）的发射功能出现在西部的核，叠加在一个更广泛的光谱分量。一个可能的解释是弱脉泽发射通过视线放大的背景连续源。还有一个更广泛的HNC 3-2发射功能的北部和南部的核。这一特征类似于西核周围的双极OH脉泽形态。需要大量的HNC丰度来解释来自这种温暖环境的亮线发射。我们简要地讨论了这方面的X射线化学和辐射激发。我们的结论是明亮的，可能放大的HNC排放的西部核心的Arp 220合并反映了不寻常的，也许是短暂的，环境的星暴/活动星系核活动。微弱的HNC线发射到Arp 220-东揭示了两个合并核之间的物理条件的真正差异。
英文摘要：
We present high resolution (0."4) observations of HNC J=3-2 with the SubMillimeter Array (SMA). We find luminous HNC 3-2 line emission in the western part of Arp220, centered on the western nucleus, while the eastern side of the merger shows relatively faint emission. A bright (36 K), narrow (60 km/s) emission feature emerges from the western nucleus, superposed on a broader spectral component. A possible explanation is weak maser emission through line-of-sight amplification of the background continuum source. There is also a more extended HNC 3-2 emission feature north and south of the nucleus. This feature resembles the bipolar OH maser morphology around the western nucleus. Substantial HNC abundances are required to explain the bright line emission from this warm environment. We discuss this briefly in the context of an X-ray chemistry and radiative excitation. We conclude that the luminous and possibly amplified HNC emission of the western nucleus of the Arp220 merger reflects the unusual, and perhaps transient, environment of the starburst/AGN activity there. The faint HNC line emission towards Arp220-east reveals a real difference in physical conditions between the two merger nuclei.
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