用GBT-Argus研究稠密分子云核内的复杂速度结构
Investigating the Complex Velocity Structures within Dense Molecular Cloud Cores with GBT-Argus
摘要：
我们提出了高光谱分辨率（0.023公里/秒）N $_2$ H $^+$观测致密气体动力学的核心尺度（~0.01 pc）使用最近委托阿格斯仪器的绿岸望远镜（GBT）的第一个结果。虽然在我们的目标中测量到的整个核心的拟合线速度梯度很好地与特定角动量和核心大小之间的众所周知的幂律相关性相一致，但尚不清楚所观察到的梯度是否代表核心尺度的旋转。此外，我们的Argus数据揭示了该项目中研究的所有5个目标在位置-速度（PV）空间中的详细和有趣的气体结构，这可能表明以前在许多致密核心中观察到的速度梯度实际上源于大尺度湍流或收敛流压缩，而不是刚体旋转。我们还注意到，在这项研究中，有一些目标的恒星形成盘几乎垂直于当地的速度梯度，假设速度梯度代表旋转方向，这与经典的恒星形成理论所描述的相反。这为研究恒星形成核心内角动量的输运提供了重要的信息，而这是研究原恒星盘形成的关键课题。
英文摘要：
We present the first results of high-spectral resolution (0.023 km/s) N$_2$H$^+$ observations of dense gas dynamics at core scales (~0.01 pc) using the recently commissioned Argus instrument on the Green Bank Telescope (GBT). While the fitted linear velocity gradients across the cores measured in our targets nicely agree with the well-known power-law correlation between the specific angular momentum and core size, it is unclear if the observed gradients represent core-scale rotation. In addition, our Argus data reveal detailed and intriguing gas structures in position-velocity (PV) space for all 5 targets studied in this project, which could suggest that the velocity gradients previously observed in many dense cores actually originate from large-scale turbulence or convergent flow compression instead of rigid-body rotation. We also note that there are targets in this study with their star-forming disks nearly perpendicular to the local velocity gradients, which, assuming the velocity gradient represents the direction of rotation, is opposite to what is described by the classical theory of star formation. This provides important insight on the transport of angular momentum within star-forming cores, which is a critical topic on studying protostellar disk formation.
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。
