2025-09-18 中国科学院（CAS）
Hierarchical gas kinematic structures. Starting from the upper left and moving clockwise from large to small scales: upper left —”spiral-like” system; upper right — “bar-like” structure; lower right — rotating infalling envelope; lower left — accretion disk. (Image by SHAO)
＜関連情報＞
- https://english.cas.cn/newsroom/research_news/phys/202509/t20250919_1055088.shtml
- https://www.science.org/doi/10.1126/sciadv.ady6953
棒状渦巻状巨大高密度核におけるガスストリーマー供給型非整列原始星円盤 A misaligned protostellar disk fed by gas streamers in a barred spiral-like massive dense core
Xiaofeng Mai, Tie Liu, Xunchuan Liu, Bo Zhang, […] , and Zhiqiang Shen
Science Advances Published:17 Sep 2025
DOI:https://doi.org/10.1126/sciadv.ady6953
Abstract
High-mass stars, born in massive dense cores (MDCs), profoundly affect the cosmic ecosystem through feedback processes and metal enrichment, yet little is known about how MDCs assemble and transfer mass across scales to form high-mass young stellar objects (HMYSOs). Using multiscale [40 to 2500 astronomical units (au)] observations of an MDC hosting an HMYSO, we identify a coherent dynamical structure analogous to barred spiral galaxies: three ~20,000 au spiral arms feed a ~7500 au central bar, which channels gas to a ~2000 au pseudodisk. Further accretion proceeds through the inner structures, including a Keplerian disk and an inner disk (~100 au), which are thought to be driving a collimated bipolar outflow. These multiscale structures (spiral arms, bar, streamers, envelope, disk, and outflow) have been simultaneously observed as a physically coherent structure within an MDC. Our discovery suggests that well-organized hierarchical structures play a crucial role during the gas accretion and angular momentum buildup of a massive disk.
