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There is growing evidence that high-mass star formation (HMSF) is amultiscale, dynamical process in molecular clouds, where filaments transportgas material between larger and smaller scales. We analyze here multiscale gasdynamics in an HMSF filamentary cloud, G034.43+00.24 (G34), using APEXobservations 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 ofG34. The nature of these inflows is gravity driven. We also find clump-scalegas infall in the middle ridge of the MM2, MM4, and MM5 clumps from otherlines. Their gas infall rates could depend on large-scale filamentary gasinflows since the infall/inflow rates on these two scales are comparable. Weconfirm that the multiscale, dynamical HMSF scenario is at work in G34. Itcould be driven by gravity up to the filament scale, beyond which turbulenceoriginating from several sources, including gravity, could be in effect in G34.

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