论文标题
Carma-Nro猎户座调查：通过碰撞引起的磁重新连接形成细丝 - 猎户座中的棍子
The CARMA-NRO Orion Survey: Filament Formation via Collision-Induced Magnetic Reconnection -- The Stick in Orion A
论文作者
论文摘要
在猎户座的{\ it Herschel}地图中确定了一个独特的细丝。我们称棍子的灯丝是统治者，并且处于早期进化阶段。横向位置图显示了两个速度组件在棒上关闭。灯丝在C $^{18} $ O（1-0）通道图中显示连续的环/叉，这让人联想到磁重新连接产生的结构。我们建议通过碰撞诱导的磁重新连接（CMR）形成的棍子。我们使用磁流失动力学（MHD）代码achena ++来模拟两个漫射的分子块之间的碰撞，每个分子块都带有一个抗平行磁场。团块碰撞会产生狭窄，笔直的灯丝，密度增加了200美元。密集气体的产量比自由下落倒塌快七倍。致密的细丝显示辐射传递图中的环/叉状结构。细丝中的芯被表面磁压限制。 CMR可以是银河系及其他地区中重要的燃气产生机制。
A unique filament is identified in the {\it Herschel} maps of the Orion A giant molecular cloud. The filament, which, we name the Stick, is ruler-straight and at an early evolutionary stage. Transverse position-velocity diagrams show two velocity components closing in on the Stick. The filament shows consecutive rings/forks in C$^{18}$O(1-0) channel maps, which is reminiscent of structures generated by magnetic reconnection. We propose that the Stick formed via collision-induced magnetic reconnection (CMR). We use the magnetohydrodynamics (MHD) code Athena++ to simulate the collision between two diffuse molecular clumps, each carrying an anti-parallel magnetic field. The clump collision produces a narrow, straight, dense filament with a factor of $>$200 increase in density. The production of the dense gas is seven times faster than free-fall collapse. The dense filament shows ring/fork-like structures in radiative transfer maps. Cores in the filament are confined by surface magnetic pressure. CMR can be an important dense-gas-producing mechanism in the Galaxy and beyond.
