论文标题

索非亚观测30多拉多斯:ii-磁场和大型气体运动学

SOFIA observations of 30 Doradus: II -- Magnetic fields and large scale gas kinematics

论文作者

Tram, Le Ngoc, Bonne, Lars, Hu, Yue, Lopez-Rodriguez, Enrique, Guerra, Jordan A., Lesaffre, Pierre, Gusdorf, Antoine, Hoang, Thiem, Lee, Min-Young, Lazarian, Alex, Andersson, B-G, Coude, Simon, Soam, Archana, Vacca, William D., Lee, Hyeseung, Gordon, Michael

论文摘要

大型麦哲伦云的心脏(30 doradus)是一个复杂的区域,具有清晰的核心 - 哈洛结构。恒星群集R $ \的反馈已被证明是在外部区域中产生多个PC尺度扩展壳的主要能源,并在电离源附近雕刻了星云核心。我们介绍了从索非亚/HAWC+在89、154和214 $ \,μ$ m的远红外极化观测中推断出的30多拉德斯的磁场(B场)的形态和强度。 B场的形态很复杂,显示了R $ \,$ 136的弯曲结构。此外,我们还使用来自Apex的Sofia/Great and Co(2-1)的高光谱和角度分辨率[\ TextSc {CII}]。该区域的运动学结构与B场的形态相关,并显示了多个膨胀壳的证据。使用Davis-Chandrasekhar-Fermi方法和结构功能估算的B场强度图在最多600、450和350 $ \,μ$ G时分别在89、154和214 $ \,μ$ M时显示出云的变化。我们估计,30个多拉多斯云中的大多数是亚临界和亚alfvénic。气体密度的概率分布函数表明,湍流主要是压缩驱动的,而血浆β参数表示超音速湍流。我们表明,B场足以在R $ \ $ 136的反馈下保持云结构的完整性。我们建议超音速压缩湍流使局部重力崩溃并触发新一代恒星形成。使用[\ textsc {CII}]和CO(2-1)的速度梯度技术(VGT)可能会确认这些结果。

The heart of the Large Magellanic Cloud, 30 Doradus, is a complex region with a clear core-halo structure. Feedback from the stellar cluster R$\,$136 has been shown to be the main source of energy creating multiple pc-scale expanding-shells in the outer region, and carving a nebula core in the proximity of the ionization source. We present the morphology and strength of the magnetic fields (B-fields) of 30 Doradus inferred from the far-infrared polarimetric observations by SOFIA/HAWC+ at 89, 154, and 214$\,μ$m. The B-field morphology is complex, showing bending structures around R$\,$136. In addition, we use high spectral and angular resolution [\textsc{CII}] observations from SOFIA/GREAT and CO(2-1) from APEX. The kinematic structure of the region correlates with the B-field morphology and shows evidence of multiple expanding shells. Our B-field strength maps, estimated using the Davis-Chandrasekhar-Fermi method and structure-function, show variations across the cloud within a maximum of 600, 450, and 350$\,μ$G at 89, 154, and 214$\,μ$m, respectively. We estimated that the majority of the 30 Doradus clouds are sub-critical and sub-Alfvénic. The probability distribution function of the gas density shows that the turbulence is mainly compressively driven, while the plasma beta parameter indicates supersonic turbulence. We show that the B-field is sufficient to hold the cloud structure integrity under feedback from R$\,$136. We suggest that supersonic compressive turbulence enables the local gravitational collapse and triggers a new generation of stars to form. The velocity gradient technique (VGT) using [\textsc{CII}] and CO(2-1) is likely to confirm these results.

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