2023/11/07 by En Chen, Chen, En, Yu Gao +17 · 2 citations
Chemical Engineering · Chemistry · Physics and Astronomy · #Advanced Combustion Engine Technologies #Astrophysics #Astrophysics and Star Formation Studies #Astrophysics of Galaxies (astro-ph.GA) #Biology #Cloud computing #Collision #Computer science #FOS: Physical sciences #Molecular cloud #Physics #Spectroscopy and Laser Applications #Star formation #Stars
paper · pdf · doi:10.48550/arxiv.2311.03948
published in arXiv (Cornell University) (Cornell University)
openalex publication_date 2023/11/07 · openalex created_date 2023/11/09 · openalex updated_date 2026/07/28
We present the analysis of cloud-cloud collision (CCC) process in the Galactic molecular complex S235. Our new CO observations performed with the PMO-13.7m telescope reveal two molecular clouds, namely the S235-Main and the S235-ABC, with ∼ 4 km s-1 velocity separation. The bridge feature, the possible colliding interface and the complementary distribution of the two clouds are significant observational signatures of cloud-cloud collision in S235. The most direct evidence of cloud-cloud collision process in S235 is that the S235-Main (in a distance of 1547+44-43 pc) and S235-ABC (1567+33-39 pc) meet at almost the same position (within 1σ error range) at a supersonic relative speed. We identified ten 13CO clumps from PMO-13.7m observations, 22 dust cores from the archival SCUBA-2 data, and 550 YSOs from NIR-MIR data. 63% of total YSOs are clustering in seven MST groups (M1-M7). The tight association between the YSO groups (M1 & M7) and the bridge feature suggests that the CCC process triggers star formation there. The collisional impact subregion (the South) shows 3∼5 times higher CFE and SFE (average value of 12.3% and 10.6%, respectively) than the non-collisional impact subregion (2.4% and 2.6%, respectively), suggesting that the CCC process may have enhanced the CFE and SFE of the clouds compared to those without collision influence.