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首页> 外文期刊>Publications of the Astronomical Society of Australia >A Spectral Line Survey of IRAS 17470-2853 from 86.1 to 92.1 GHz
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A Spectral Line Survey of IRAS 17470-2853 from 86.1 to 92.1 GHz

机译：IRAS 17470-2853在86.1至92.1 GHz范围内的频谱线调查

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摘要

We present results from a spectral line survey of the young stellar object IRAS 17470-2853, undertaken to examine chemical changes during the evolution from hot molecular cores to ultracompact HII regions. Observations were carried out with the Mopra 22 m radio telescope in the frequency range from 86.1 to 92.1 GHz. A total of 21 lines from 9 molecules were detected. Except for CH3CN they are all simple molecules. We compare the results to the ultracompact HII region G34.3+0.15, where spectral line surveys in the frequency range 80a€“115 GHz and 330a€“360 GHz have been performed. While the molecular lines detected are similar, their widths and intensities are somewhat narrower and lower, respectively, in IRAS 17470-2853. The typical line width of ??5 km sa?’1 indicates relatively quiet or quasi-thermal emission. On the other hand, a significant difference in T A* (HNC)/T A*(HCN) has been found: 0.8 for IRAS 17470-2853 compared to 2.6 for G34.3+0.15. The broad line width of SiO (?…=0, J=2a€“1), ??9 km sa?’1, suggests that IRAS 17470-2853 is experiencing a shock generated by the embedded object. Column densities, or lower limits to them, are derived for observed molecules.
机译：我们目前对年轻的恒星物体IRAS 17470-2853进行的光谱线调查得出的结果，旨在检查从热分子核到超紧凑HII区域的演化过程中的化学变化。使用Mopra 22 m射电望远镜在86.1至92.1 GHz的频率范围内进行了观测。从9个分子中总共检测出21条品系。除了CH 3 CN，它们都是简单分子。我们将结果与超紧凑型HII区域G34.3 + 0.15进行了比较，该区域已在80a“ 115 GHz”和330a“ 360 GHz频率范围内进行了频谱线调查。尽管检测到的分子线相似，但在IRAS 17470-2853中，它们的宽度和强度分别略窄和略低。典型的线宽“ 5 km sa？’1”表示相对安静或准热辐射。另一方面，已发现T A *（HNC）/ T A *（HCN）的显着差异：IRAS 17470-2853为0.8，而G34.3 + 0.15为2.6。 SiO的宽线宽度（？…= 0，J = 2a“ 1”，？9 km sa？'1，表明IRAS 17470-2853受到嵌入物体产生的冲击。对于观察到的分子，得出了柱密度或它们的下限。

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