Multiscale Dynamical Scenario of High-mass Star Formation in an IRDC Filament G34

Abstract

There is growing evidence that high-mass star formation (HMSF) is a multiscale, dynamical process in molecular clouds, where filaments transport gas material between larger and smaller scales. We analyze here multiscale gas dynamics in an HMSF filamentary cloud, G034.43+00.24 (G34), using APEX observations of the C18O (2-1), HCO+/H13CO+ (3-2), and HCN/H13CN (3-2) lines. We find large-scale, filament-aligned velocity gradients from C18O emission, which drive filamentary gas inflows onto dense clumps in the middle ridge of G34. The nature of these inflows is gravity driven. We also find clump-scale gas infall in the middle ridge of the MM2, MM4, and MM5 clumps from other lines. Their gas infall rates could depend on large-scale filamentary gas inflows since the infall/inflow rates on these two scales are comparable. We confirm that the multiscale, dynamical HMSF scenario is at work in G34. It could be driven by gravity up to the filament scale, beyond which turbulence originating from several sources, including gravity, could be in effect in G34.

9 pages, 9 figures, published at ApJ. The link at https://iopscience.iop.org/article/10.3847/1538-4357/ad10ac

References in corpus (15)

• What determines the density structure of molecular clouds ? A case study of Orion B with Herschel
• High-mass Star Formation through Filamentary Collapse and Clump-fed Accretion in G22
• Understanding star formation in molecular clouds II. Signatures of gravitational collapse of IRDCs
• Gravity, Magnetic Field, and Turbulence: Relative Importance and Impact on Fragmentation in the Infrared Dark Cloud G34.43+00.24
• ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions -- XV. Steady Accretion from Global Collapse to Core Feeding in Massive Hub-filament System SDC335
• ATOMS:ALMA Three-millimeter Observations of Massive Star-forming regions -- III :Catalogues of candidate hot molecular cores and Hyper/Ultra compact HII regions
• Evidence of high-mass star formation through multi-scale mass accretion in hub-filament-system clouds
• Large-scale periodic velocity oscillation in the filamentary cloud G350.54+0.69
• Direct observational evidence of the multi-scale, dynamical mass accretion toward a high-mass star forming hub-filament system
• ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions-IX. A pilot study towards IRDC G034.43+00.24 on multi-scale structures and gas kinematics
• ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions -- XII: Fragmentation and multi-scale gas kinematics in protoclusters G12.42+0.50 and G19.88-0.53
• Continuity of accretion from clumps to Class 0 high-mass protostars in SDC335
• Velocity Anisotropy in Self-Gravitating Molecular Clouds. I: Simulation
• The parallax and 3D kinematics of water masers in the massive star-forming region G034.43+0.24
• Deviation from a Continuous and Universal Turbulence Cascade in NGC 6334 due to Massive Star Formation Activity

Cited by in corpus (3)

• ALMA-IMF XIII: N${}_2$H${}^{+}$ kinematic analysis on the intermediate protocluster G353.41
• ALMA-IMF XVIII: The assembly of a star cluster: Dense N${}_2$H${}^{+}$ (1-0) kinematics in the massive G351.77 protocluster
• The Hierarchical Dynamical State of Molecular Gas from 3 to 300 pc in NGC 253