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【DoA Seminar】June 10th by Shuo Kong (University of Arizona)
Description
Title: Magnetically regulated molecular cloud formation
Speaker: Shuo Kong (University of Arizona)
Abstract:
We investigate molecular cloud formation in a magnetically dominated regime. Two atomic gas clouds with cold neutral medium (CNM) 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.
Bio:
Dr. Shuo Kong is an Assistant Professor in the Department of Astronomy and an Assistant Astronomer at Steward Observatory, University of Arizona. His research focuses on understanding the process of star formation. He is particularly interested in the role of magnetic fields and their interplay with filamentary gas clouds in the interstellar medium. Dr. Kong got his BS degree in Physics from Peking University. Then he completed a PhD degree in Astronomy from University of Florida. After that, he was a postdoctoral researcher at Yale University and University of Arizona. Since then, he joined the Steward Observatory, University of Arizona as a faculty member.
Time: 14:00-15:00, 10/June, Wednesday
Venue: Room 506 (Large seminar room), Department of Astronomy
Venue: Room 506 (Large seminar room), Department of Astronomy
You can also access the seminar via：https://meeting.tencent.com/dm/TaPhuREMh1nT #腾讯会议：796-717-353
