Cloud-cloud collision and star formation in G013.313+0.193

Berdikhan D. Esimbek J. Henkel C. Xu Y. Zhou J. Liu D.-J. Abdikamalov E. Ma Y. Komesh T. He Y. Zhang W. Tang X. Wu G. Li D. Zhou D. Tursun K. Shen H. Imanaly E. Jandaolet Q. Manapbayeva A. Tuiakbayeva D.
1 July 2025 EDP Sciences

Astronomy and Astrophysics
2025 #699

We study the G013.313+0.193 (G013.313) region, a complex environment characterised by molecular cloud interactions indicative of cloud-cloud collision (CCC). Observations of the NH₃ (1,1) and (2,2) inversion transitions were obtained using the Nanshan 26 m radio telescope, while HCO⁺ (J = 1- 0), ¹²CO, ¹³CO, and C¹⁸O (J = 1- 0) transitions from the 14 m Purple Mountain Observatory Delingha (PMODLH) 14 m telescope. Archival data are also included. We identified key observational signatures of CCC, including complementary spatial distributions, U-shaped structures, bridge features, and V-shaped velocity distributions. The position- velocity (P- V) diagrams reveal clear indications of gas interaction between two velocity components, suggesting an ongoing collision at an estimated angle of ∼ 45 to the line of sight. The estimated collision timescale is 0.35- 1.03 Myr, aligned with the inferred ages of young stellar objects (YSOs) in the region, supporting the hypothesis of collision-induced star formation. Hub-filament systems (HFSs) are identified in the compressed gas region, where filaments converge towards a dense hub, suggesting the CCC as a potential driver of HFS and massive star formation. The high column density (∼2 × 10²³ cm^-2) suggests favourable conditions for the formation of massive stars. Although alternative kinematic drivers such as longitudinal collapse and shear motion are considered, CCC remains the most plausible explanation for the observed features. Our findings contribute to our understanding of the mechanisms of cloud dynamics and massive star formation in turbulent molecular environments.

ISM: clouds , ISM: individual objects: G013.313+0.193 , ISM: kinematics and dynamics , Line: profiles

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Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, 830011, China
University of Chinese Academy of Sciences, Beijing, 100080, China
Energetic Cosmos Laboratory, Nazarbayev University, Astana, 010000, Kazakhstan
State Key Laboratory of Radio Astronomy and Technology, A20 Datun Road, Chaoyang District, Beijing, 100101, China
Xinjiang Key Laboratory of Radio Astrophysics, Urumqi, 830011, China
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, 53121, Germany
Astronomy Department, King Abdulaziz University, PO Box 80203, Jeddah, 21589, Saudi Arabia
Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, 210023, China
College of Mathematical and Physics, China Three Corges University, Yichang, 443002, China
Department of Physics, Nazarbayev University, Astana, 010000, Kazakhstan
Institute of Experimental and Theoretical Physics, Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
Sh. Ualikhanov Kokshetau University, 76 Abaya St., Kokshetau, 020000, Kazakhstan

Xinjiang Astronomical Observatory
University of Chinese Academy of Sciences
Energetic Cosmos Laboratory
State Key Laboratory of Radio Astronomy and Technology
Xinjiang Key Laboratory of Radio Astrophysics
Max-Planck-Institut für Radioastronomie
Astronomy Department
Purple Mountain Observatory
College of Mathematical and Physics
Department of Physics
Institute of Experimental and Theoretical Physics
Sh. Ualikhanov Kokshetau University

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