论文标题
Orion-kl源中的离子流出i？
An ionized outflow in Orion-KL source I?
论文作者
论文摘要
我们在Orion-KL中以6和14 GHz的源呈现图像。在较高的频率下，从43到340 GHz，该源的图像由100 au直径的室外磁盘中的灰尘产生的热发射，但是在6和14 GHz时，沿磁盘的次要轴伸长发射，与中心对象的SIO双极流出相符。高斯拟合到6、14、43和99 GHz图像沿磁盘次要轴的组件，其磁通量和长度随频率而变化，与离子流出的自由发射一致。数据有利于磁盘风中的大量流出，而不是狭窄的电离喷气机。来源I在2021年获得的高分辨率5 GHz E-Merlin观测值中未被发现。SRCI的5-6 GHz结构可以通过E-Merlin合成束的高侧孔结构解决，或者是时间变量。
We present images at 6 and 14 GHz of Source I in Orion-KL. At higher frequencies, from 43 to 340 GHz, images of this source are dominated by thermal emission from dust in a 100 AU diameter circumstellar disk, but at 6 and 14 GHz the emission is elongated along the minor axis of the disk, aligned with the SiO bipolar outflow from the central object. Gaussian fits to the 6, 14, 43, and 99 GHz images find a component along the disk minor axis whose flux and length vary with frequency consistent with free-free emission from an ionized outflow. The data favor a broad outflow from a disk wind, rather than a narrow ionized jet. Source I was undetected in higher resolution 5 GHz e-MERLIN observations obtained in 2021. The 5-6 GHz structure of SrcI may be resolved out by the high sidelobe structure of the e-MERLIN synthesized beam, or be time variable.
