Core Insights - The research conducted by the Shanghai Astronomical Observatory and other institutions using the FAST telescope has revealed complex filamentary structures in the G165 high-velocity interstellar gas cloud, providing new insights into the early evolutionary mechanisms of interstellar media [1][2] Group 1: Research Findings - The G165 cloud, composed mainly of hydrogen atoms, is located approximately 50,000 light-years from Earth and is moving at a speed of about 300 kilometers per second [1] - G165 is characterized by a significant presence of warm neutral medium and exhibits notable supersonic turbulent motion, with local velocity fluctuations exceeding 20 kilometers per second [2] - The study indicates that G165's composition is almost entirely made up of warm neutral gas, contrasting with typical high-velocity clouds that show a mix of cold and warm gas, suggesting that G165 represents an earlier stage in the evolution of interstellar clouds [2] Group 2: Structural Observations - Observations using the 21-centimeter line of neutral hydrogen from FAST have revealed highly structured features within G165, filled with complex interwoven filamentary structures distributed across multiple velocity layers [2] - These filamentary structures exhibit a twisted morphology in three-dimensional space, with a significantly asymmetric radial density profile, indicating the presence of shock compression processes and strong turbulence within the system [2]

△具有复杂内部结构的极高速云概念图 该研究通过FAST中性氢21厘米谱线观测，清晰地揭示出G165内部存在高度结构化的特征：其内部充满复杂交织的丝状结构，这些结构在多个速度层中形成 网状分布。这些丝状体在三维空间中以扭曲形态相互交错，其径向密度剖面呈现显著不对称性。这一结构形态表明G165内部存在激波压缩过程，系统整体 呈现出强烈的湍流特征。 该研究成果为揭示恒星形成区的物质来源与演化路径提供了新线索。科研团队未来将继续依托FAST望远镜，对更多极高速云开展系统观测，进一步探索星 际结构形成的普适物理规律。 （总台央视记者 帅俊全 褚尔嘉） 近日，中国科学院上海天文台联合国内外科研机构，依托500米口径球面射电望远镜（FAST），在银河系一团超高速运动的星际气体云中，首次观测到了由 超音速湍流主导的复杂丝状结构网络。这一成果为揭示星际介质在结构形成早期的演化机制提供了全新视角，相关成果于2025年7月16日在国际学术期刊 《自然·天文学》（Nature Astronomy）在线发表。 这项研究的对象是一个被称作G165的极高速云（VHVC）。这是一团由氢原子组成的大质量气体云，距离地球约5万光年，位于远离银河 ...