论文标题
磁化丝状气体流动，向南蛇植物喂养幼小的嵌入式簇
Magnetized filamentary gas flows feeding the young embedded cluster in Serpens South
论文作者
论文摘要
观察结果表明，分子云被强烈磁化，并且磁场会影响恒星的形成。支持分子云被显着磁化的结论的关键观察是，其内部结构的方向与磁场的方向密切相关。在低柱密度下，结构与该场平行排列，而在较高的柱密度下，气体结构通常定向垂直于磁场，在视觉灭绝时进行过渡$ a_v \ gtrsim {} 3〜 \ rm {} mag $。在这里，我们使用来自索非亚HAWC+极性计的远红外极化观测值报告相对取向的进一步过渡，即，在$ A_V \ gtrsim {} 21〜 \ rm {} Mag $中的返回平行对齐。这种过渡似乎是由气流引起的，并表明磁性超临界度接近$ a_v \ gtrsim {} 21〜 \ rm {} mag $，即使存在相对强的磁场，也会允许引力塌陷和星团形成。
Observations indicate that molecular clouds are strongly magnetized, and that magnetic fields influence the formation of stars. A key observation supporting the conclusion that molecular clouds are significantly magnetized is that the orientation of their internal structure is closely related to that of the magnetic field. At low column densities the structure aligns parallel with the field, whereas at higher column densities, the gas structure is typically oriented perpendicular to magnetic fields, with a transition at visual extinctions $A_V\gtrsim{}3~\rm{}mag$. Here we use far-infrared polarimetric observations from the HAWC+ polarimeter on SOFIA to report the discovery of a further transition in relative orientation, i.e., a return to parallel alignment at $A_V\gtrsim{}21~\rm{}mag$ in parts of the Serpens South cloud. This transition appears to be caused by gas flow and indicates that magnetic supercriticality sets in near $A_V\gtrsim{}21~\rm{}mag$, allowing gravitational collapse and star cluster formation to occur even in the presence of relatively strong magnetic fields.
