SDC13中心-暗条系统的形成：多尺度磁场上的云-云碰撞
Formation of the SDC13 Hub-Filament System: A Cloud-Cloud Collision Imprinted on The Multiscale Magnetic Field
摘要：
中心暗条系统（HFS）是原星团和大质量恒星形成的潜在场所，在物质积累中起着关键作用。我们报告JCMT POL-2 850 $μ$ m偏振观测到的大规模的HFS SDC 13。我们检测到一个有组织的磁场中心附近的云规模的“U形”形态以下的枢纽的西部边缘。结合大尺度APEX 13 CO和普朗克极化数据，我们发现SDC 13位于沿大尺度部分螺旋状磁场的三个巨分子云（GMC）的会聚点上.较小的“U”形磁场垂直于大尺度磁场和会聚GMC。我们解释这是云与云碰撞的结果。在SDC 13中，我们发现局部重力和速度梯度指向细丝脊和轮毂中心。这表明气体可以局部地被拉到细丝上，并且整体会聚到枢纽中心。中心枢纽的维里分析表明，重力主导的磁能和动能。结合大尺度和小尺度的分析，我们认为SDC 13最初是由沿大尺度磁场运动的云碰撞形成的。在激波后区域，在初始湍流能量消散之后，重力接管并开始驱动气体沿着细丝向轮毂中心吸积。
英文摘要：
Hub-filament systems (HFSs) are potential sites of protocluster and massive star formation, and play a key role in mass accumulation. We report JCMT POL-2 850 $μ$m polarization observations toward the massive HFS SDC13. We detect an organized magnetic field near the hub center with a cloud-scale "U-shape" morphology following the western edge of the hub. Together with larger-scale APEX 13CO and PLANCK polarization data, we find that SDC13 is located at the convergent point of three giant molecular clouds (GMCs) along a large-scale, partially spiral-like magnetic field. The smaller "U-shape" magnetic field is perpendicular to the large-scale magnetic field and the converging GMCs. We explain this as the result of a cloud-cloud collision. Within SDC13, we find that local gravity and velocity gradients point toward filament ridges and hub center. This suggests that gas can locally be pulled onto filaments and overall converges to the hub center. A virial analysis of the central hub shows that gravity dominates magnetic and kinematic energy. Combining large- and small-scale analyses, we propose that SDC13 is initially formed from a collision of clouds moving along the large-scale magnetic field. In the post-shock regions, after the initial turbulent energy has dissipated, gravity takes over and starts to drive the gas accretion along the filaments toward the hub center.
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