arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2101.03293astro-ph.GA
收藏

原恒星系统中磁盘风与幕式喷流相互作用的首次探测

First Detection of Interaction between a Magnetic Disk Wind and an Episodic Jet in a Protostellar System

Chin-Fei Lee, Benoit Tabone, Sylvie Cabrit, Claudio Codella, Linda Podio, Ferreira, J., Jacquemin-Ide, J

摘要:

原恒星盘的旋转外流可能追踪扩展磁流体动力学(MHD)盘风(DW),为恒星形成的盘吸积中的角动量问题提供了一个解决方案。在喷射系统HH 212中,在SO中检测到旋转流出,其围绕在SiO中检测到的幕式喷射。在这里,我们在空间上解决这个SO流出成三个组成部分:一个准直的射流与SiO喷流,广角磁盘流出,和一个大的射流驱动的弓形激波之间的真空腔。虽然它是理论上预测之前,这是第一次,这样的射流DW相互作用直接观察和解决,它是至关重要的正确解释和建模的非解决DW候选人。解决的运动学和亮度分布都支持广角外流是一个扩展的MHD DW主导的本地角动量提取到40 au,但与内部发射半径截断为$\gtrsim 4$ au。在4au内,DW可能不存在,磁旋转不稳定性(MRI)可能向外传输角动量。HH 212中的喷流-DW相互作用可能存在于其他类似系统中,为探测原恒星盘中的大尺度磁场开辟了一条全新的途径。

英文摘要:

Rotating outflows from protostellar disks might trace extended magneto-hydrodynamic (MHD) disk winds (DWs), providing a solution to the angular momentum problem in disk accretion for star formation. In the jet system HH 212, a rotating outflow was detected in SO around an episodic jet detected in SiO. Here we spatially resolve this SO outflow into three components: a collimated jet aligned with the SiO jet, the wide-angle disk outflow, and an evacuated cavity in between created by a large jet-driven bowshock. Although it was theoretically predicted before, it is the first time that such a jet-DW interaction is directly observed and resolved, and it is crucial for the proper interpretation and modeling of non-resolved DW candidates. The resolved kinematics and brightness distribution both support the wide-angle outflow to be an extended MHD DW dominating the local angular momentum extraction out to 40 au, but with an inner launching radius truncated to $\gtrsim 4$ au. Inside 4 au, where the DW may not exist, the magneto-rotational instability (MRI) might be transporting angular momentum outwards. The jet-DW interaction in HH 212, potentially present in other similar systems, opens an entirely new avenue to probe the large-scale magnetic field in protostellar disks.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑