W28场TeV gamma-ray源稠密分子气体的12 mm测线测量
12mm line survey of the dense molecular gas towards the W28 field TeV gamma-ray sources
摘要：
我们提出了12毫米Mopra观测致密分子气体对W28超新星遗迹（SNR）领域。重点讨论了H.E.S.S.探测到的TeV伽马射线源的致密分子气体。这些望远镜可能追踪来自W28和该地区其他来源的宇宙射线。使用NH3反转跃迁，我们揭示了分子云内部的几个致密核心，其中大部分与高质量恒星形成和HII区域相吻合，包括高能超紧凑HII区域G5.89-0.39。一个关键的例外是W28东北部的云，众所周知，它被1720 MHz的OH脉泽和宽CO线发射的集群所破坏。在这里，我们检测到广泛的NH3，（9，9）过渡，线宽高达16公里/秒。这种广泛的NH3排放空间匹配以及TeV源HESS J1801-233和CO排放，其速度色散分布表明从W28 SNR方向的外部中断。其他谱线也被发现，如HC 3 N和HC 5 N，H2O脉泽，以及许多射电复合谱线，所有这些谱线都主要在南部的高质量恒星形成区被发现。这些观测为W28 SNR场致密分子气体的内部结构和动力学提供了新的视角，并与未来更高分辨率的TeV γ射线观测相结合，将提供探测宇宙射线进入分子云的传输的机会。
英文摘要：
We present 12mm Mopra observations of dense molecular gas towards the W28 supernova remnant (SNR) field. The focus is on the dense molecular gas towards the TeV gamma-ray sources detected by the H.E.S.S. telescopes, which likely trace the cosmic-rays from W28 and possibly other sources in the region. Using the NH3 inversion transitions we reveal several dense cores inside the molecular clouds, the majority of which coincide with high-mass star formation and HII regions, including the energetic ultra-compact HII region G5.89-0.39. A key exception to this is the cloud north east of W28, which is well-known to be disrupted as evidenced by clusters of 1720MHz OH masers and broad CO line emission. Here we detect broad NH3, up to the (9,9) transition, with linewidths up to 16 km/s. This broad NH3 emission spatially matches well with the TeV source HESS J1801-233 and CO emission, and its velocity dispersion distribution suggests external disruption from the W28 SNR direction. Other lines are detected, such as HC3N and HC5N, H2O masers, and many radio recombination lines, all of which are primarily found towards the southern high-mass star formation regions. These observations provide a new view onto the internal structures and dynamics of the dense molecular gas towards the W28 SNR field, and in tandem with future higher resolution TeV gamma-ray observations will offer the chance to probe the transport of cosmic-rays into molecular clouds.
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