论文标题
解决中间质量原始恒星的准直区
Resolving the collimation zone of an intermediate-mass protostar
论文作者
论文摘要
我们报告了Serpens Star成型区域中三重无线电连续源的新VLA和E-Merlin高分辨率和灵敏度图像。这些观察结果使我们能够首次探索中间质量YSO的最内向区域（<〜100 au），并以〜15 au的身份分辨率进行多种频率，多上述研究。原恒星最近弹出的结的运动学分析表明，射流正在经历速度的发作变化。此外，我们的多频图像揭示了引人注目的特性，例如，高度简单的电离流将以〜0.4 au的径向距离发射，从原始恒定体中发射，而狭窄（〜28 au宽）的离子腔会受到与周围型号材料的广角组件的相互作用而激发的。鉴于这些结果，我们提出了一种场景，在这种情况下，高度碰撞的喷气机和广角风程是最合理的解释我们的观察结果的情况，要么由X-Wind或X-Plus X-Plus磁盘 - 挡风玻璃机制启动。
We report new VLA and e-MERLIN high resolution and sensitivity images of the Triple Radio continuum Source in the Serpens star forming region. These observations allowed us to perform a deep multi-frequency, multi-epoch study by exploring the innermost regions (<~100 au) of an intermediate-mass YSO for the first time, with a physical resolution of ~15 au. The kinematic analysis of knots recently ejected by the protostar indicates that the jet is undergoing episodic variations in velocity. In addition, our multi-frequency images reveal striking characteristics, e.g., a highly collimated ionized stream that would be launched at a radial distance of ~0.4 au from the protostar, and a narrow (~28 au wide) ionized cavity that would be excited by the interaction of a wide-angle component with the surrounding toroid of infalling material. In light of these results, we propose the scenario in which both a highly-collimated jet and a wide-angle wind coexist to be the most plausible to explain our observations, either launched by the X-wind or X- plus Disk-wind mechanism.
