Probing Star-forming Properties via ALMA Observations of Massive Protocluster IRAS 15596-5301

作者：Faxian Chang, Mengyao Tang, Tie Liu, Luis A Zapata, Dongting Yang, Yaping Peng, Chao Zhang, Fengwei Xu, Yanhui Chen, Shanghuo Li, Meng Ruan · 发表于：Research in Astronomy and Astrophysics · 年份：2026 · DOI：10.1088/1674-4527/ae4213 · 研究领域：Astrophysics and Star Formation Studies、Astronomy and Astrophysical Research、Stellar, planetary, and galactic studies

Abstract To deepen our understanding of star-forming properties, we studied a massive protocluster IRAS 15596-5301 (I15596) using ALMA 870 μ m and 3 mm data. High-resolution 870 μ m data reveal 34 dense cores, including three hot molecular cores, with subsequent line surveys detecting 22 molecular species toward them. Two velocity components (I15596-red/I15596-blue) were found in the averaged H 13 CO + (1–0) spectrum, and two filaments were identified from velocity-resolved integrated intensity maps. A spatial overlap between the two filaments was observed, and this overlapping region exhibits a distinct bridge-shaped feature in the position–velocity diagram constructed along the entire filamentary structures. Combined with the reduced H 13 CO + /HCO + ratio in the overlapping region and the three-dimensional position-position–velocity cube data, we conclude that a non-head-on collision occurs between the edges of the two filamentary structures in I15596. Cluster analysis demonstrates that clusters located in the collision region host more evolved chemical rich dense cores than their counterparts in other regions. Our results thus indicate that star formation in I15596 is triggered or accelerated by a mild non-head-on collision between two filaments.