银道面远侧脉泽源的三角视差
Trigonometric Parallaxes of Maser Sources toward the Far Side of the Milky Way
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中文总结 AI 辅助
本研究通过八个脉泽源的三角视差和自行测量，确定了远侧旋臂的距离与归属，证实人马臂和英仙臂在内银河汇聚，支持银河系旋臂二分叉模型。
中文摘要 AI 辅助
我们给出了与高质量恒星形成区相关联的八个脉泽源的三角视差和自行。在2024年至2025年间，我们观测了四个22 GHz H$_2$O脉泽和四个6.7 GHz CH$_3$OH脉泽，共八个历元。结合视差、自行和视向速度信息，我们确定了这些源的距离和旋臂归属。新测量的远侧脉泽将人马臂和英仙臂的已知分布延伸至银经小至$\ell\sim10^\circ$。它们的位置和运动学与最近基于脉泽天体测量更新的旋臂模型吻合良好。特别是，新测量表明远侧的人马臂和英仙臂趋向于在内银河汇聚成一个共同的旋臂特征。这一构型与银河系旋臂结构的二分叉情景一致，尽管一个未解析的臂间结构提供了另一种解释，目前尚不能排除。
英文摘要
We present trigonometric parallaxes and proper motions for eight maser sources associated with high-mass star-forming regions. Four 22 GHz H$_2$O masers and four 6.7 GHz CH$_3$OH masers were observed over eight epochs between 2024 and 2025. Combining parallax, proper-motion, and radial-velocity information, we determine distances and spiral-arm assignments for these sources. The newly measured far-side masers extend the known distributions of the Sagittarius and Perseus arms toward Galactic longitudes as small as $\ell\sim10^\circ$. Their locations and kinematics agree well with recently updated spiral-arm models based on maser astrometry. In particular, the new measurements show that the far-side Sagittarius and Perseus arms tend to converge toward a common spiral feature in the inner Galaxy. This configuration is consistent with the bifurcation scenario proposed for the Milky Way spiral structure, although an unresolved inter-arm structure provides an alternative interpretation that cannot yet be excluded.
发表机构
- Purple Mountain Observatory, Chinese Academy of Sciences（中国科学院紫金山天文台）
- State Key Laboratory of Radio Astronomy and Technology, Purple Mountain Observatory, Chinese Academy of Sciences（中国科学院紫金山天文台射电天文与技术重点实验室）
- University of Science and Technology of China（中国科学技术大学）
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences（中国科学院新疆天文台）
机构由 AI 辅助整理，请以论文原文为准。
