Title: Interplay between magnetic fields, gravity, and turbulence within Hub-filament systems
Speaker: Jia-Wei Wang (ASIAA)
Date: Oct 01 at 14:30
Location: R019, Physics Building
Abstract:
Magnetic fields are a key component in star formation theories. Nevertheless, their exact role in the formation of stars is still a topic of debate due to the difficulty in measuring magnetic fields. Over the past decades, observers commonly rely on the global physical properties of star-forming clouds to evaluate the role of magnetic fields, such as the mass-to-magnetic-flux ratio, due to the instrumental limitation, and thus it is difficult to probe how the physical parameters correlate and evolve within clouds. In this talk, I will present our studies on the interplay between magnetic fields, gravity, and turbulence within two hub-filament clouds G33.92+0.41 and SDC13, highlighting the local correlation of these parameters. Our results show that the role of these parameters is environment-dependent. The magnetic fields in G33.92+0.41 are likely guiding the ambient material accreted on the main filaments, but be dominated by gravity as the local density increases. In SDC13, we found that the cloud-scale magnetic field is likely originated from the large-scale cloud-cloud collision. The magnetic field, enhanced by the shock compression, might play some in regulating the cloud fragmentation, and hence result in a grid-like network.
