瞄准星系晕的星际磁炮：蛇夫座和狼疮分子复合体起源处的年轻气泡
Interstellar magnetic cannon targeting the Galactic halo : A young bubble at the origin of the Ophiuchus and Lupus molecular complexes
摘要：
我们报告检测到一个新的银河系泡沫之间的接口晕和银河系盘。我们认为，附近的狼疮复合体和蛇夫座复合体的部分构成了结构的致密部分。这个年轻的气泡，年龄小于300万年，可能是超新星的遗迹，并在一个更大的HI环内膨胀，该环是由上天蝎座OB协会的流出物造成的。一个充满热X射线气体的HI空腔与该结构相关，这与银河系烟囱情景一致。X射线辐射超出了气泡的西部和西北部边缘，表明热气体流出正在突破空腔，可能是通过破碎的狼疮复合体。对该地区的偏振射电同步加速器和偏振尘埃辐射的分析表明，银河系中心的支线与年轻的银河系泡沫有关。在VLSR ~ -100 km/s时，发现了与空泡边界空间对应的HI团簇分布。这些HI团块中的一些正在形成射流，这些射流可能来自气泡的破碎部分。我们认为，这些团块可能是从充满热电离气体的空腔内的壳壁上“滴落”的冷云。这些团块中的一些可能被磁化，然后被空腔边缘的压缩磁场加速。这种机制将挑战银河系吸积和喷泉模型，其中高速云被认为是由来自银河系平面的热气流在银河系高纬度形成的。
英文摘要：
We report the detection of a new Galactic bubble at the interface between the halo and the Galactic disc. We suggest that the nearby Lupus complex and parts of the Ophiuchus complex constitute the denser parts of the structure. This young bubble, < 3 Myr old, could be the remnant of a supernova and expands inside a larger HI loop that has been created by the outflows of the Upper Scorpius OB association. An HI cavity filled with hot X-ray gas is associated with the structure, which is consistent with the Galactic chimney scenario. The X-ray emission extends beyond the west and north-west edges of the bubble, suggesting that hot gas outflows are breaching the cavity, possibly through the fragmented Lupus complex. Analyses of the polarised radio synchrotron and of the polarised dust emission of the region suggest the connection of the Galactic centre spur with the young Galactic bubble. A distribution of HI clumps that spatially corresponds well to the cavity boundaries was found at V_LSR ~ -100 km/s. Some of these HI clumps are forming jets, which may arise from the fragmented part of the bubble. We suggest that these clumps might be `dripping' cold clouds from the shell walls inside the cavity that is filled with hot ionised gas. It is possible that some of these clumps are magnetised and were then accelerated by the compressed magnetic field at the edge of the cavity. Such a mechanism would challenge the Galactic accretion and fountain model, where high-velocity clouds are considered to be formed at high Galactic latitude from hot gas flows from the Galactic plane.
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