Gravitational collapse and accretion flows in the hub filament system G323.46-0.08

Ma Y. Zhou J. Esimbek J. Baan W. Li D. Tang X. He Y. Ji W. Zhou D. Wu G. Tursun K. Komesh T.
1 August 2023 EDP Sciences

Astronomy and Astrophysics
2023 #676

We studied the hub-filament system G323.46-0.08 based on archival molecular line data from the SEDIGISM 13CO survey and infrared data from the GLIMPSE, MIPS, and Hi-GAL surveys. G323.46-0.08 consists of three filaments, F-north, F-west, and F-south, that converge toward the central high-mass clump AGAL 323.459-0.079. F-west and Part1 of the F-south show clear large-scale velocity gradients 0.28 and 0.44 km s-1 pc-1, respectively. They seem to be channeling materials into AGAL 323.459-0.079. The minimum accretion rate was estimated to be 1216 M· Myr-1. A characteristic V-shape appears around AGAL323.459-0.079 in the PV diagram, which traces the accelerated gas motions under gravitational collapse. This has also been supported by model fitting results. All three filaments are supercritical and they have fragmented into many dense clumps. The seesaw patterns near most dense clumps in the PV diagram suggests that mass accretion also occurs along the filament toward the clumps. Our results show that filamentary accretion flows appear to be an important mechanism for supplying the materials necessary to form the central high-mass clump AGAL 323.459-0.079 and to propel the star forming activity taking place therein.

ISM: clouds , ISM: individual objects: G323.46-0.08 , ISM: kinematics and dynamics , Radio lines: ISM , Stars: formation

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XingJiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi, 830011, China
University of Chinese Academy of Sciences, Beijing, 100049, China
Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Urumqi, 830011, China
Xinjiang Key Laboratory of Radio Astrophysics, Urumqi, 830011, China
Netherlands Institute for Radio Astronomy, Astron, Dwingeloo, 7991, Netherlands
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, 53121, Germany
Energetic Cosmos Laboratory, Nazarbayev University, Astana, 010000, Kazakhstan
Faculty of Physics and Technology, Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan

XingJiang Astronomical Observatory
University of Chinese Academy of Sciences
Key Laboratory of Radio Astronomy
Xinjiang Key Laboratory of Radio Astrophysics
Netherlands Institute for Radio Astronomy
Max-Planck-Institut für Radioastronomie
Energetic Cosmos Laboratory
Faculty of Physics and Technology

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