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ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions - XI. From inflow to infall in hub-filament systems

Abstract : We investigate the presence of hub-filament systems in a large sample of 146 active proto-clusters, using H13CO+ J = 1-0 molecular line data obtained from the ATOMS survey. We find that filaments are ubiquitous in proto-clusters, and hub-filament systems are very common from dense core scales (~0.1 pc) to clump/cloud scales (~1-10 pc). The proportion of proto-clusters containing hub-filament systems decreases with increasing dust temperature (Td) and luminosity-to-mass ratios (L/M) of clumps, indicating that stellar feedback from H II regions gradually destroys the hub-filament systems as proto-clusters evolve. Clear velocity gradients are seen along the longest filaments with a mean velocity gradient of 8.71 km s-1 pc-1 and a median velocity gradient of 5.54 km s-1 pc-1. We find that velocity gradients are small for filament lengths larger than ~1 pc, probably hinting at the existence of inertial inflows, although we cannot determine whether the latter are driven by large-scale turbulence or large-scale gravitational contraction. In contrast, velocity gradients below ~1 pc dramatically increase as filament lengths decrease, indicating that the gravity of the hubs or cores starts to dominate gas infall at small scales. We suggest that self-similar hub-filament systems and filamentary accretion at all scales may play a key role in high-mass star formation.
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https://hal-insu.archives-ouvertes.fr/insu-03867453
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Submitted on : Wednesday, November 23, 2022 - 1:03:58 PM
Last modification on : Thursday, November 24, 2022 - 5:02:58 PM

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Jian-Wen Zhou, Tie Liu, Neal J. Evans, Guido Garay, Paul F. Goldsmith, et al.. ATOMS: ALMA Three-millimeter Observations of Massive Star-forming regions - XI. From inflow to infall in hub-filament systems. Monthly Notices of the Royal Astronomical Society, 2022, 514, pp.6038-6052. ⟨10.1093/mnras/stac1735⟩. ⟨insu-03867453⟩

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