论文标题
与阿尔玛的小麦哲伦云中的原始co流出的第一次检测
The First Detection of a Protostellar CO Outflow in the Small Magellanic Cloud with ALMA
论文作者
论文摘要
原恒星流出是恒星形成的最出色特征之一。在过去的几十年中，观察性研究成功地证明了流出与太阳金属性银河系条件下的低质量和高质量原恒星无关。然而，原始流出特性的环境依赖性仍然很少了解，尤其是在低金属性方面。在这里，我们报告了小型麦哲伦云中的分子流出的首次检测，其使用0.2 $ z {\ odot} $，使用Atacama大毫米/亚毫米阵列观测值，以0.1 PC的空间分辨率朝向巨大的protostar Y246。 Co（3-2）排放以$ \ gtrsim $ 15 km s $^{ - 1} $的高速翼（3-2）发射的高速翅膀很好地说明了双极流出。流出的评估特性（动量，机械力等）与银河系相一致。我们的结果表明，分子流出，即小规模的磁盘积聚的指南可能与金属性范围内的质恒星普遍相关，$ \ sim $ 0.2-1 $ 0.2-1 $ z _ {\ odot} $。
Protostellar outflows are one of the most outstanding features of star formation. Observational studies over the last several decades have successfully demonstrated that outflows are ubiquitously associated with low- and high-mass protostars in the solar-metallicity Galactic conditions. However, the environmental dependence of protostellar outflow properties is still poorly understood, particularly in the low-metallicity regime. Here we report the first detection of a molecular outflow in the Small Magellanic Cloud with 0.2 $Z_{\odot}$, using Atacama Large Millimeter/submillimeter Array observations at a spatial resolution of 0.1 pc toward the massive protostar Y246. The bipolar outflow is nicely illustrated by high-velocity wings of CO(3-2) emission at $\gtrsim$15 km s$^{-1}$. The evaluated properties of the outflow (momentum, mechanical force, etc.) are consistent with those of the Galactic counterparts. Our results suggest that the molecular outflows, i.e., the guidepost of the disk accretion at the small scale, might be universally associated with protostars across the metallicity range of $\sim$0.2-1 $Z_{\odot}$.
