报告题目：Magnetically regulated molecular cloud formation

报告人：Dr. Shuo Kong（University of Arizona）

报告摘要： We investigate molecular cloud formation in a magnetically dominated regime. Two atomic gas clouds with cold neutral medium conditions are driven to collide at an interface of oppositely directed magnetic fields. The collision triggers magnetic reconnection, forming a ~20 pc filamentary cloud with rich fiber-like substructure. By 5 Myr, the filament develops a fully molecular spine. Radiative transfer modeling of far-infrared dust emission reveals dense cores distributed along the filament, some of which host one to a few sinks spread over a ~5 pc region near the filament center. High-resolution views show that sink-hosting cores are connected by dust fibers and associated with high-velocity CO emission, consistent with active accretion through streamers because surface fields act against inflowing gas. Supersonic turbulence in the filament is magnetically driven, arising from trans-Alfvénic magnetic transport. These results demonstrate that filamentary molecular clouds with observed physical properties can form in a magnetically dominated environment without the need for gravity (although gravity will later dominate), and are naturally wrapped by a helical/toroidal magnetic field that should produce reversed magnetic fields on opposite sides of the filament from most viewing angles.

报告时间：2026年6月23日10:00

报告地点：紫台仙林园区5号楼516会议室

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