Filamentary structure of star-forming complexes

Abstract

The nearest young stellar groups are associated with "hubs" of column density exceeding 10^22 cm^-2, according to recent observations. These hubs radiate multiple "filaments" of parsec length, having lower column density and fewer stars. Systems with many filaments tend to have parallel filaments with similar spacing. Such "hub-filament structure" is associated with all of the nine young stellar groups within 300 pc, forming low-mass stars. Similar properties are seen in infrared dark clouds forming more massive stars. In a new model, an initial clump in a uniform medium is compressed into a self-gravitating, modulated layer. The outer layer resembles the modulated equilibrium of Schmid-Burgk (1967) with nearly parallel filaments. The filaments converge onto the compressed clump, which collapses to form stars with high efficiency. The initial medium and condensations have densities similar to those in nearby star-forming clouds and clumps. The predicted structures resemble observed hub-filament systems in their size, shape, and column density, and in the appearance of their filaments. These results suggest that hub-filament structure associated with young stellar groups may arise from compression of clumpy gas in molecular clouds.

accepted by ApJ, to appear August 10, 2009

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• Kronberger 55: A Candidate for End-dominated Collapse Scenario
• Inverse Hubble Flows in Molecular Clouds
• From theory to observation: understanding filamentary flows in high-mass star-forming clusters
• A low-mass hub-filament with double centre revealed in NGC2071-North
• Investigations of MWISP Filaments. I. Filament Identification and Analysis Algorithms, and Source Catalogue
• Comparison of Herschel and ArTéMiS observations of massive filaments
• Analytic growth rate of gravitational instability in self-gravitating planar polytropes
• Rebounding Cores to Build Star Cluster Multiple Populations
• Kinematics of young stellar objects in NGC 2024 based on infrared proper motions
• Centrally concentrated star formation in young clusters
• Exploration about the origin of galactic and extragalactic star clusters through simulated H-R diagrams
• Linear filament and nested cluster evolution tomography (LANCET) I. Capture the evolution of dense gas in 14-parsec filament G316.8
• Sutra : An integrated framework for identification and characterization of filaments in the interstellar medium
• Evolution of compressed clouds formed by filament coalescence. I. Oblique collisions
• The influence of magnetic fields in Cloud-Cloud Collisions
• Revealing the Connection Between the Filamentary Hierarchy and Star Cluster Formation in a Simulated NGC 628 Galaxy
• Unveiling Fiber Networks and Core Formation in the DR21 South Filament
• FIRESTORM I: Stellar Feedback and Gas Kinematics in the Evolved W40 Hub-Filament System