在南煤袋附近，通过上半人马座-狼疮超级气泡的磁场
On the magnetic field through the Upper Centaurs-Lupus Super bubble, in the vicinity of the Southern Coalsack
摘要：
南煤袋位于上半人马座-狼疮（UCL）超级气泡的内部，并显示出许多特征，这些特征指向一个比黑暗，无星分子云更有活力的环境。一个炽热的、放射X射线的包层包围着这个云，它有一个非常强的内部磁场，它最黑暗的核心似乎在天文学的时间尺度上“即将”开始形成恒星。为了探测云的磁环境，并与基于光学/近红外偏振测量的云场估计进行比较，我们已经获得了对脉冲星PSR J1210 $-$ 6550的法拉第旋转测量，探测云附近的磁场，以及比较目标PSR J1435 $-$ 5954，在一个类似的视线距离，但从云几度。因此，这两条视线主要是探测UCL超级泡沫。早先对煤袋内部磁场的估计，是用光学和近红外偏振测量的费米子-拉塞卡法得出的，B $_\perp$ = 64- 93 $μ$ G。然而，即使PSR J1210 $-$ 6550位于距云（CO）边缘仅30弧分的$\sim$，测得的场强也仅为B $_\parallel$ = 1.1 $\pm$ 0.2 $μ$ G。虽然因此产生一个非常高的场对比度的云，我们认为，这可能被理解为由于云的超级气泡的影响。
英文摘要：
The Southern Coalsack is located in the interior of the Upper Centaurus-Lupus (UCL) super bubble and shows many traits that point to a much more energetic environment than might be expected from a dark, starless molecular cloud. A hot, X-ray emitting, envelope surrounds the cloud, it has a very strong internal magnetic field and its darkest core seems to be on astronomical time scales "just about" to start forming stars. In order to probe the magnetic environment of the cloud and to compare with the optical/near infrared polarimetry-based field estimates for the cloud, we have acquired Faraday Rotation measurements towards the pulsar PSR J1210$-$6550, probing the magnetic field in the vicinity of the cloud, and a comparison target, PSR J1435$-$5954, at a similar line of sight distance but several degrees from the cloud. Both lines of sight hence primarily probe the UCL super bubble. The earlier estimates of the magnetic field inside the Coalsack, using the Chandrasekhar-Fermi method on optical and near-infrared polarimetry, yield B$_\perp$ = 64--93 $μ$G. However, even though PSR J1210$-$6550 is located only $\sim$30 arc minutes from the (CO) edge of the cloud, the measured field strength is only B$_\parallel$ = 1.1$\pm$0.2 $μ$G. While thus yielding a very high field contrast to the cloud we argue that this might be understood as due to the effects on the cloud by the super bubble.
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