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

Abstract

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 Part 1 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 AGAL 323.459-0.079 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.

References in corpus (20)

• Trigonometric Parallaxes Of High-Mass Star Forming Regions: Our View Of The Milky Way
• A Spitzer Survey of Young Stellar Clusters within One Kiloparsec of the Sun: Cluster Core Extraction and Basic Structural Analysis
• MAMBO Mapping of Spitzer c2d Small Clouds and Cores
• Filamentary structure of star-forming complexes
• ATLASGAL --- properties of a complete sample of Galactic clumps
• Properties of Hi-GAL clumps in the inner Galaxy]{The Hi-GAL compact source catalogue. I. The physical properties of the clumps in the inner Galaxy ($-71.0^{\circ }<\ell <67.0^{\circ }$)
• Large-scale filaments associated with Milky Way spiral arms
• A 24 Micron Point Source Catalog of the Galactic Plane from Spitzer/MIPSGAL
• The SEDIGISM survey: first data release and overview of the Galactic structure
• Aspect Ratio Dependence of the Free-Fall Time for Non-Spherical Symmetries
• High-mass Star Formation through Filamentary Collapse and Clump-fed Accretion in G22
• The Hi-GAL catalogue of dusty filamentary structures in the Galactic Plane
• Kinetic temperature of massive star forming molecular clumps measured with formaldehyde
• Kinetic temperature of massive star-forming molecular clumps measured with formaldehyde. III. The Orion Molecular Cloud 1
• The SEDIGISM survey: a search for molecular outflows
• Kinematics and Structure of Star-forming Regions: Insights from Cold Collapse Models
• Kinetic temperature of massive star-forming molecular clumps measured with formaldehyde IV. The ALMA view of N113 and N159W in the LMC
• DR 21 South Filament: a Parsec-sized Dense Gas Accretion Flow onto the DR 21 Massive Young Cluster
• Multi-scale decomposition of astronomical maps -- a constrained diffusion method
• Cloud-cloud collision and star formation in G323.18+0.15

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