用NANTEN2和Mopra望远镜观测的朝向Westerlund 2、RCW 49和HESS J1023-575的喷流和弧分子云; 12 CO和13 CO（J=2-1和J=1-0）
The jet and arc molecular clouds toward Westerlund 2, RCW 49, and HESS J1023-575; 12CO and 13CO (J=2-1 and J=1-0) observations with NANTEN2 and Mopra Telescope
摘要：
我们对星团Westerlund 2和TeV伽马射线源HESS J1023-575的两种分子云进行了新的CO观测，我们称之为“喷流”和“弧”云。急流云从Westerlund 2的位置向东呈现线性结构。此外，我们还在西边发现了一个新的反喷云。弧形云在HESS J1023-575以西呈新月形。在喷流云的边缘发现了恒星形成的迹象，并给出了喷流云年龄的限制。多CO转换的分析给出了高达20 K的喷流云的几个地方的温度，这表明一些额外的加热可能是局部操作。新的TeV伽马射线图像由H.E.S.S.在空间上与喷流和弧云的对应比与韦斯特伦德2号相关的巨大分子云更好。我们认为，喷流和弧云与韦斯特隆德2号没有物理联系，而是位于7.5千秒差距附近的更远的距离。具有长期活动的微类星体可能提供一个可能的引擎来形成喷流和弧云，并产生TeV的伽马射线，尽管已知的微类星体都没有Myr年龄或稳定的TeV伽马射线。另一种可能是，一个发生在约百万年前的各向异性超新星爆炸可能会形成喷流和弧云，而TeV的伽马射线辐射则需要爆炸后形成的微类星体。
英文摘要：
We have made new CO observations of two molecular clouds, which we call "jet" and "arc" clouds, toward the stellar cluster Westerlund 2 and the TeV gamma-ray source HESS J1023-575. The jet cloud shows a linear structure from the position of Westerlund 2 on the east. In addition, we have found a new counter jet cloud on the west. The arc cloud shows a crescent shape in the west of HESS J1023-575. A sign of star formation is found at the edge of the jet cloud and gives a constraint on the age of the jet cloud to be ~Myrs. An analysis with the multi CO transitions gives temperature as high as 20 K in a few places of the jet cloud, suggesting that some additional heating may be operating locally. The new TeV gamma-ray images by H.E.S.S. correspond to the jet and arc clouds spatially better than the giant molecular clouds associated with Westerlund 2. We suggest that the jet and arc clouds are not physically linked with Westerlund 2 but are located at a greater distance around 7.5 kpc. A microquasar with long-term activity may be able to offer a possible engine to form the jet and arc clouds and to produce the TeV gamma-rays, although none of the known microquasars have a Myr age or steady TeV gamma-rays. Alternatively, an anisotropic supernova explosion which occurred ~Myr ago may be able to form the jet and arc clouds, whereas the TeV gamma-ray emission requires a microquasar formed after the explosion.
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