Emergence of high-mass stars in complex fiber networks (EMERGE) V. From filaments to spheroids: the origin of the hub-filament systems

Abstract

Identified as parsec-size, gas clumps at the junction of multiple filaments, hub-filament systems (HFS) play a crucial role during the formation of young clusters and high-mass stars. These HFS appear nevertheless to be detached from most galactic filaments when compared in the mass-length (M-L) phase-space. We aim to characterize the early evolution of HFS as part of the filamentary description of the interstellar medium. Combining previous scaling relations with new analytic calculations, we created a toy model to explore the different physical regimes described by the M-L diagram. Despite its simplicity, our model accurately reproduces several observational properties reported for filaments and HFS such as their expected typical aspect ratio ($A$), mean surface density ($\Sigma$), and gas accretion rate ($\dot{m}$). Moreover, this model naturally explains the different mass and length regimes populated by filaments and HFS, respectively. Our model predicts a dichotomy between filamentary ($A\ge 3$) and spheroidal ($A<3$) structures connected to the relative importance of their fragmentation, accretion, and collapse timescales. Individual filaments with low accretion rates are dominated by an efficient internal fragmentation. In contrast, the formation of compact HFS at the intersection of filaments triggers a geometric phase-transition leading to the gravitational collapse of these structures at parsec-scales in $\sim$1Myr also inducing higher accretion rates.

Accepted by A&A, 17 pages, 11 figures

References in corpus (47)

• Array Programming with NumPy
• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• Cold streams in early massive hot haloes as the main mode of galaxy formation
• Filamentary structure of star-forming complexes
• ATLASGAL --- properties of a complete sample of Galactic clumps
• ATLASGAL --- towards a complete sample of massive star forming clumps
• The Nature of the Dense Core Population in the Pipe Nebula: Thermal Cores Under Pressure
• 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 ($-71.0^{\circ }<\ell <67.0^{\circ }$)
• Cooling, Gravity and Geometry: Flow-driven Massive Core Formation
• Chains of dense cores in the Taurus L1495/B213 complex
• The dynamical properties of dense filaments in the infrared dark cloud G035.39-00.33
• The identification of filaments on far infrared and submillimiter images. Morphology, physical conditions and relation with star formation of filamentary structure
• The JCMT BISTRO Survey: The magnetic field strength in the Orion A filament
• Isolating signatures of major cloud-cloud collisions using position-velocity diagrams
• Revealing the physical properties of molecular gas in Orion with a large scale survey in J=2-1 lines of 12CO, 13CO and C18O
• Six Myths on the Virial Theorem for Interstellar Clouds
• Triggered O star formation in M20 via cloud-cloud collision: Comparisons between high-resolution CO observations and simulations
• Filamentary Accretion Flows in the Infrared Dark Cloud G14.225-0.506 Revealed by ALMA
• 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
• Dust polarized emission observations of NGC 6334; BISTRO reveals the details of the complex but organized magnetic field structure of the high-mass star-forming hub-filament network
• The Hi-GAL catalogue of dusty filamentary structures in the Galactic Plane
• The Green Bank Ammonia Survey: Dense Cores Under Pressure in Orion A
• Cluster Formation Triggered by Filament Collisions in Serpens South
• Evidence of high-mass star formation through multi-scale mass accretion in hub-filament-system clouds
• An ALMA study of hub-filament systems I. On the clump mass concentration within the most massive cores
• Filament coalescence and hub structure in MonR2: Implications to massive star and cluster formation
• Formation of the Hub-Filament System G33.92+0.11: Local Interplay between Gravity, Velocity, and Magnetic Field
• On the typical width of Herschel filaments
• Distance biases in the estimation of the physical properties of Hi-GAL compact sources-I. Clump properties and the identification of high-mass star forming candidates
• ALMA-IRDC: Dense gas mass distribution from cloud to core scales
• Multi-scale dynamics in star-forming regions: the interplay between gravity and turbulence
• The SQUALO project (Star formation in QUiescent And Luminous Objects) I: clump-fed accretion mechanism in high-mass star-forming objects
• Far-infrared observations of a massive cluster forming in the Monoceros R2 filament hub
• The accretion history of high-mass stars: An ArTéMiS pilot study of Infrared Dark Clouds
• Star formation in the Sh 2-53 region influenced by accreting molecular filaments
• The DR21(OH) Trident -- Resolving the Massive Ridge into Three Entangled Fibers As the Initial Condition of Cluster Formation
• Probing the structure of a massive filament: ArTeMiS 350 and 450 micron mapping of the integral-shaped filament in Orion A
• Statistical model for filamentary structures of molecular clouds -- The modified multiplicative random cascade model and its multifractal nature
• DR 21 South Filament: a Parsec-sized Dense Gas Accretion Flow onto the DR 21 Massive Young Cluster
• Kinematics and star formation toward W33: a central hub as a hub--filament system
• TRAO Survey of the nearby filamentary molecular clouds, the universal nursery of stars (TRAO FUNS). II. Filaments and Dense cores in IC 5146
• Cloud-cloud collision as origin of the G31.41+0.31 massive protocluster
• An ALMA Glimpse of Dense Molecular Filaments Associated with High-mass Protostellar Systems in the Large Magellanic Cloud
• On the evolution of the observed Mass-to-Length relationship for star-forming filaments
• Kinematics and star formation of hub-filament systems in W49A
• Simulation of Head-on Collisions Between Filamentary Molecular Clouds Threaded by a Lateral Magnetic Field and Subsequent Evolution