From Filaments to Oscillating Starless Cores

Abstract

Long wavelength sonic oscillations are observed or inferred in many of the small, dark molecular clouds, the starless cores, that are the precursors to protostars. The oscillations provide significant internal energy and the time scale for their dissipation may control the rate of star formation in the starless cores. Despite their importance, their origin is unknown. We explore one hypothesis that the oscillations develop as a starless core forms from a filament. We model this process with a numerical hydrodynamic simulation and generate synthetic molecular line observations with a radiative transfer simulation. Comparison with actual observations shows general agreement suggesting the proposed mechanism is viable.

submitted to MNRAS

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Cited by in corpus (7)

• Fragmentation of Molecular Clumps and Formation of Protocluster
• Oscillating Filaments: I - Oscillation and Geometrical Fragmentation
• Merging Filaments I: A race against collapse
• On filament fragmentation and the impact of ambient environment on it
• Taking off the edge -- simultaneous filament and end core formation
• Filament collapse: a two phase process
• Filament fragmentation: Density gradients suppress end dominated collapse