论文标题
奥菲丘斯恒星形成复合物中的年轻恒星和分子云之间的相互作用
Interplay between Young Stars and Molecular Clouds in the Ophiuchus Star-forming Complex
论文作者
论文摘要
我们介绍了恒星恒星形成区域的年轻恒星种群与云层之间的空间和运动学相关性。恒星样品由从文献中获取的各种进化阶段的已知幼体组成,其中一些被诊断为Gaia EDR3视差和适当运动测量。分子气是由850 $ $ m mibsillimetre commillimetre commil-us-us-user-bolometer-2图像所追踪的,达到$ \ sim $ \ sim $ 2.3 mjy beam $^{ - 1} $,迄今为止该地区最深的是詹姆斯·克莱克·麦克斯韦(James Clerk Maxwell)端口的最深层次,从詹姆斯·克莱克·麦克斯韦(James Clerk Maxwell)望远镜/瞬态程序中堆叠,以探测可检测sibblimeter outects optect oftects ofdects optburst Expert。我们的分析表明,比I类和具有足够的杂质物质的扁平光谱来源更远离云的较远的来源,即II级和III级恒星,距离云更远,并且与出生云密切相关。特别是发现II级和III级的人群表现出结构化的空间分布,指示了附近的Sco-Cen OB关联的冲击阵线通过,从而压缩了云层以触发恒星形成,现在最新的星播在最密集的云丝中发生。年轻的明星在所有进化阶段都具有相似的运动学。这表明恒星模式追踪了现在已经分散的父母云丝的遗物。
We present spatial and kinematic correlation between the young stellar population and the cloud clumps in the Ophiuchus star-forming region. The stellar sample consists of known young objects at various evolutionary stages, taken from the literature, some of which are diagnosed with Gaia EDR3 parallax and proper-motion measurements. The molecular gas is traced by the 850 $μ$m Submillimetre Common-User Bolometer Array-2 image, reaching $\sim$2.3 mJy beam$^{-1}$, the deepest so far for the region, stacked from the James Clerk Maxwell Telescope/Transient program aiming to detect submillimeter outburst events. Our analysis indicates that the more evolved sources, namely the class II and III young stars, are located further away from clouds than class I and flat-spectrum sources that have ample circumstellar matter and are closely associated with natal clouds. Particularly the class II and III population is found to exhibit a structured spatial distribution indicative of passage of shock fronts from the nearby Sco-Cen OB association thereby compressing clouds to trigger star formation, with the latest starbirth episode occurring now in the densest cloud filaments. The young stars at all evolutionary stages share similar kinematics. This suggests that the stellar patterns trace the relics of parental cloud filaments that now have been dispersed.