论文标题
在金牛座B18云中发现新的分子气泡流出结构
Discovery of a New Molecular Bubble-Outflow Structure in the Taurus B18 Cloud
论文作者
论文摘要
由于出色的反馈，恒星形成可以产生气泡和流出。流出和气泡向周围的星际介质注入动量和能量，因此与分子云的整体能量平衡有关。分子气泡可以通过高分辨率的射电望远镜解决，以量化恒星形成对分子云的影响。我们在这里报告了带有流出的新分子气泡的鉴定，以及位于气泡中心的Herbig Haro物体HH319。多波长数据已用于研究其空间结构，能量注入和动态时间尺度。这个气泡的动能为$ \ rm 5.8 \ times 10^{43} $ erg在金牛座的气泡最小半径内，0.077 pc。泡沫形成$ \ sim $ 70，000年前。根据$ GAIA $ EDR3的原始速度的适当运动速度，气泡西南边缘的T Tauri二元星（Fy Tau和Fz Tau）可能产生了流出的泡沫结构。这是在低和中间质量恒星形成区域中发现的不寻常的新结构。仅V380 ORI驱动的Orion A中的气泡具有相似的结构。气泡流出结构为Tauri恒星的恒星风理论提供了其他观察性证据。它增强了我们对恒星反馈如何对分子云的作用的理解。
Star formation can produce bubbles and outflows, as a result of stellar feedback. Outflows and bubbles inject momentum and energy into the surrounding interstellar medium, and so are related to the overall energy balance of the molecular cloud. Molecular bubbles can be resolved by higher-resolution radio telescopes to quantify the effect of star formation on molecular clouds. We report here the identification of a new molecular bubble with an outflow, and an Herbig Haro object, HH319, located at the bubble center. Multi-wavelength data have been utilized to study its spatial structure, energy injection, and dynamical timescale. This bubble has a kinetic energy of $\rm 5.8 \times 10^{43}$ erg within the smallest radius of a bubble in Taurus, 0.077 pc. The bubble formed $\sim$70,000 years ago. According to the proper motion velocities of protostars from $Gaia$ EDR3, the T Tauri binary stars (FY Tau and FZ Tau) at the southwest edge of the bubble may have produced the outflow-bubble structure. This is an unusual new structure found in low- and intermediate-mass star formation regions. Only a bubble in Orion A, driven by V380 Ori, has a similar structure. The bubble-outflow structure provides additional observational evidence for the theory of stellar wind from T Tauri stars. It enhances our understanding of how stellar feedback acts on molecular clouds.
